Patran 2008 R1 Interface To Ls-dyna Preference Guide

Patran 2008 r1 Interface To LS-DYNA Preference Guide

Main Index

Corporate

Europe

Asia Pacific

MSC.Software Corporation 2 MacArthur Place Santa Ana, CA 92707 USA Telephone: (800) 345-2078 Fax: (714) 784-4056

MSC.Software GmbH Am Moosfeld 13 81829 Munich, Germany Telephone: (49) (89) 43 19 87 0 Fax: (49) (89) 43 61 71 6

MSC.Software Japan Ltd. Shinjuku First West 8F 23-7 Nishi Shinjuku 1-Chome, Shinjuku-Ku Tokyo 160-0023, JAPAN Telephone: (81) (3)-6911-1200 Fax: (81) (3)-6911-1201

Worldwide Web www.mscsoftware.com

Disclaimer This documentation, as well as the software described in it, is furnished under license and may be used only in accordance with the terms of such license. MSC.Software Corporation reserves the right to make changes in specifications and other information contained in this document without prior notice. The concepts, methods, and examples presented in this text are for illustrative and educational purposes only, and are not intended to be exhaustive or to apply to any particular engineering problem or design. MSC.Software Corporation assumes no liability or responsibility to any person or company for direct or indirect damages resulting from the use of any information contained herein. User Documentation: Copyright ©2008 MSC.Software Corporation. Printed in U.S.A. All Rights Reserved. This notice shall be marked on any reproduction of this documentation, in whole or in part. Any reproduction or distribution of this document, in whole or in part, without the prior written consent of MSC.Software Corporation is prohibited. The software described herein may contain certain third-party software that is protected by copyright and licensed from MSC.Software suppliers. Contains IBM XL Fortran for AIX V8.1, Runtime Modules, (c) Copyright IBM Corporation 1990-2002, All Rights Reserved. MSC, MSC/, MSC Nastran, MD Nastran, MSC Fatigue, Marc, Patran, Dytran, and Laminate Modeler are trademarks or registered trademarks of MSC.Software Corporation in the United States and/or other countries. NASTRAN is a registered trademark of NASA. PAM-CRASH is a trademark or registered trademark of ESI Group. SAMCEF is a trademark or registered trademark of Samtech SA. LS-DYNA is a trademark or registered trademark of Livermore Software Technology Corporation. ANSYS is a registered trademark of SAS IP, Inc., a wholly owned subsidiary of ANSYS Inc. ACIS is a registered trademark of Spatial Technology, Inc. ABAQUS, and CATIA are registered trademark of Dassault Systemes, SA. EUCLID is a registered trademark of Matra Datavision Corporation. FLEXlm is a registered trademark of Macrovision Corporation. HPGL is a trademark of Hewlett Packard. PostScript is a registered trademark of Adobe Systems, Inc. PTC, CADDS and Pro/ENGINEER are trademarks or registered trademarks of Parametric Technology Corporation or its subsidiaries in the United States and/or other countries. Unigraphics, Parasolid and I-DEAS are registered trademarks of UGS Corp. a Siemens Group Company. All other brand names, product names or trademarks belong to their respective owners.

P3*2008R1*Z*DYND*Z* DC-USR

Main Index

Contents Patran Interface to LS-DYNA Preference Guide

1

Overview Purpose

2

LS-DYNA Product Information

4

What is Included with this Product?

5

LS-DYNA Preference Integration with Patran Patran LS-DYNA Preference Components

6 7

Configuring the Patran LS-DYNA Execute File

2

Building A Model Introduction to Building a Model Coordinate Frames Finite Elements 19 Nodes 20 Elements 21 Multi-Point Constraints Material Library Materials Form

12

18

22

30 31

Element Properties 62 Element Properties Form 62 Loads and Boundary Conditions

91

Loads and Boundary Conditions Form Object Tables 100 Load Cases

Main Index

110

92

10

ii Patran Interface to LS-DYNA Preference Guide ==

3

Running an Analysis Review of the Analysis Form Analysis Form 113 Translation Control

112

115

Solution Parameters 116 Solution Control 117 Relaxation Parameters 118 Global Damping 119 Material Viscosity Defaults 119 Energy Calculation 120 Shell Control 121 Contact Defaults 122 Select Load Case

123

Output Requests

124

Output Controls

133

Select Groups for Set Cards Setting LSDYNA IDs

4

134

135

Read Results Review of the Read Results Form Read Results Form 139 Subordinate Forms 141 Select State File Subordinate Form Select Times 142 Select Results 143 Results Created in Patran Results File Size

5

138

141

144

145

Read Input File Review of Read Input File Form Read Input File Form 149

148

Data Translated from the LS-DYNA Input File

Main Index

152

CONTENTS iii

Reject and Error File

6

Files Files

Main Index

158

156

iv Patran Interface to LS-DYNA Preference Guide ==

Main Index

Chapter 1: Overview Patran Interface to LS-DYNA Preference Guide

1

Main Index

Overview 

Purpose



LS-DYNA Product Information



What is Included with this Product?



LS-DYNA Preference Integration with Patran



Patran LS-DYNA Preference Components



Configuring the Patran LS-DYNA Execute File

2 4 5 6 7 10

2 Patran Interface to LS-DYNA Preference Guide Purpose

Purpose Patran is an analysis software system developed and maintained by MSC.Software Corporation. The core of the system is Patran, a finite element analysis pre- and post-processor. The Patran system also includes several optional products such as advanced postprocessing programs, tightly coupled solvers, and interfaces to third party solvers. This document describes one of these interfaces. The Patran LS-DYNA Application Preference provides a communication link between Patran and LSDYNA. It also provides customization of certain features that can be activated by selecting LS-DYNA as the analysis code “Preference” in Patran. The LS-DYNA Preference is fully integrated into Patran. The casual user will never need to be aware separate programs are being used. For the expert user, there are four main components of the preference: a PCL function, load_lsdyna3d(), which will load all LS-DYNA specific definitions, like element types and material models, into the currently opened database, pat3lsdyna to convert model topology from the Patran database into the analysis code input file, and to translate model data from an LS-DYNA input file, and lsdynapat3 to translate results and/or model data from the analysis code results file into the Patran database. Selecting LS-DYNA as the analysis code under the “Analysis Preference” menu modifies Patran forms in five main areas: 1. Materials 2. Element Properties 3. Finite Elements/MPCs and Meshing 4. Loads and Boundary Conditions 5. Analysis forms The PCL function load_lsdyna3d() can be invoked by simply typing its name into the Patran command line. It will load LS-DYNA specific definitions into the Patran database currently opened. LSDYNA specific definitions can be added to any Patran database (which does not already contain LSDYNA specific definitions) at any time. Obviously, a Patran database must be open for load_lsdyna3d() to operate correctly. See LS-DYNA Preference Integration with Patran (p.4) for complete information and a description of how to create a new template database. pat3lsdyna translates model data between the Patran database and the analysis code-specific input file format. This translation must have direct access to the originating Patran database when an LS-DYNA input file is being created. lsdynapat3 translates results and/or model data from the analysis, code-specific results file into the Patran database. This program can be run so the data is loaded directly into the Patran database, or if incompatible computer platforms are being used, an intermediate file can be created. lsdynapat3 executes a program that is written and supported by Ove Arup Computing Systems, 13 Fitzroy Street, London W1P 6BQ (Tel: (44) 020-7465-2500, Fax: (44) 020 7465 2211). Ove Arup distribute and support LS-DYNA in the UK. They contribute actively to the development, documentation, and quality assurance of LS-DYNA and develop their own translators between LS-

Main Index

Chapter 1: Overview 3 Purpose

DYNA and third party pre and post processing systems. They have collaborated with MSC to ensure that LS-DYNA is effectively and efficiently interfaced to Patran. pat3lsdyna also translates model data from the analysis, code-specific input file into the Patran database. Reading LS-DYNA Input Files This release of the Patran LS-DYAN3D interface provides support for reading LS-DYNA input files. Nodes, elements, coordinate systems, some materials and some properties are read from an input file.

Main Index

4 Patran Interface to LS-DYNA Preference Guide LS-DYNA Product Information

LS-DYNA Product Information LS-DYNA is a general-purpose explicit finite element computer program for nonlinear dynamic analysis of structures in three dimensions. The program is developed, supported, and maintained by Livermore Software Technology Corporation (LSTC), 2876 Waverley Way, Livermore, California 94550 (Tel: 925-449-2500, Fax: 925-449-2507). See the LS-DYNA User’s Manual for a general description of LS-DYNA3D’s capabilities.

Main Index

Chapter 1: Overview 5 What is Included with this Product?

What is Included with this Product? The LS-DYNA Preference product includes the following items: 1. A PCL function contained in p3patran.plb which will add LS-DYNA specific definitions to any Patran database (not already containing such definitions) at any time. 2. A PCL library called lsdyna3d.plb and contained in the directory. This library is used by the analysis forms to produce analysis code specific translation parameter, solution parameter, etc. forms. 3. On Windows, a library called lsdyna3ddra.dll contained in the /bin/exe directory. On Unix, a library called liblsdyna3ddra in the /lib. 4. A script file called LsDyna3dExecute is contained in the /bin/exe directory on Unix. 5. This Patran LS-DYNA Preference Guide is included as part of the product. An online version is also provided to allow the direct access to this information from within Patran.

Main Index

6 Patran Interface to LS-DYNA Preference Guide LS-DYNA Preference Integration with Patran

LS-DYNA Preference Integration with Patran Creation of an LS-DYNA Template Database Two versions of the Patran database are delivered with Patran. Both occur in the directory and they are named base.db and template.db. The base.db database is a Patran database into which no analysis code specific definitions, such as element types and material models, have been stored. The template.db database is a version of the Patran database which contains every analysis code specific definition needed by the MSC supplied interfaces. In order to create a template database which contains only LS-DYNA specific definitions, the user should follow these steps: 1. Within Patran open a new database using base.db as the template. 2. Enter load_lsdyna3d() into the command line. 3. Save this database under a name like lsdyna.db to be your new “LS-DYNA only” template database 4. From then on, when opening a new database, choose lsdyna3d.db as your template database. Any databases derived from base.db may not contain the needed LS-DYNA specific definitions needed to run the LS-DYNA Preference. But, LS-DYNA specific definitions can be added to any database at any time by simply typing load_lsdyna3d() into the Patran command line while the target database is the database currently opened by Patran. Due to the savings in size and for the sake of simplicity it is highly recommended template.db not be used as a template database and that users create their own unique template database which contains only the analysis code specific definitions pertaining to the analysis codes of immediate interest. For more details about adding analysis code specific definitions to a database and/or creating unique template databases, refer to the Patran Installation and Operations Guide.

Main Index

Chapter 1: Overview 7 Patran LS-DYNA Preference Components

Patran LS-DYNA Preference Components The diagrams shown below indicate how the functions, scripts, programs and files which constitute the LS-DYNA Preference affect the Patran environment. Site customization, in some cases, is indicated. Figure 1-1 shows the process of running an analysis. The lsdyna3d.plb library defines the Translation Parameter, Solution Type, Solution Parameter, and Output Request forms called by the Analysis form. When the Apply button is pushed on the Analyze form pat3lsdyna is executed. pat3lsdyna reads data from the database and creates the LS-DYNA input file. A message file is also created to record any translation messages. If pat3lsdyna finishes successfully, and the user requests it, the script will then start LS-DYNA.

Figure 1-1

Main Index

Forward Translation

8 Patran Interface to LS-DYNA Preference Guide Patran LS-DYNA Preference Components

Figure 1-2 shows the process of reading information from LS-DYNA State or Time History files. When

the Apply button is selected on the Read Results form, either a .jbm or .jbr file is created, depending on whether model or results data is to be read. The LsdynaPat3Submit script is also started. The script, in turn, starts the lsdynapat3 results translation. The Patran database is closed while this translation occurs. lsdynapat3 reads the data from the LS-DYNA State and Time History Files. If lsdynapat3 can find the desired database, the results will be loaded directly into it. However, if it cannot find the database (e.g., you are running on incompatible platforms), lsdynapat3 will write all the data into a flat file. This flat file can be taken to wherever the database is, and read by using the read file selections.

Figure 1-2

Results File Translation

Figure 1-3 shows the process of translating information from a LS-DYNA input file into a Patran

database. The behavior of the main Analysis/Read Input File form and the subordinate file select form is

Main Index

Chapter 1: Overview 9 Patran LS-DYNA Preference Components

dictated by the lsdyna3d.plb PCL library. The Apply button on the main form activates the pat3lsdyna program which reads the specified LS-DYNA input file into the Patran database.

Figure 1-3

Main Index

LS-DYNA Input File Translation

10 Patran Interface to LS-DYNA Preference Guide Configuring the Patran LS-DYNA Execute File

Configuring the Patran LS-DYNA Execute File The LsDyna3dExecute script file controls the execution of the LS DYNA analysis code. Please see the LS-DYNA documentation and comments in the LsDyna3dExecute script for details of how to configure this script.

Main Index

Chapter 2: Building A Model Patran Interface to LS-DYNA Preference Guide

2

Main Index

Building A Model 

Introduction to Building a Model



Coordinate Frames



Finite Elements

19



Material Library

30



Element Properties



Loads and Boundary Conditions



Loads and Boundary Conditions Form



Load Cases

110

12

18

62 91 92

12 Patran Interface to LS-DYNA Preference Guide Introduction to Building a Model

Introduction to Building a Model There are many aspects to building a finite element analysis model. In several cases, the forms used to create the finite element data are dependent on the selected analysis code and analysis type. Other parts of the model are created using standard forms. Under Preferences on the Patran main form, is a selection for Analysis that defines the intended analysis code to be used for this model.

The analysis code may be changed at any time during model creation.This is especially useful if the model is to be used for different analyses, in different analysis codes. As much data as possible will be converted if the analysis code is changed after the modeling process has begun. The analysis option defines what will be presented to the user in several areas during the subsequent modeling steps. These areas include the material and element libraries, including multi-point constraints, the applicable loads and boundary conditions, and the analysis forms. The selected Analysis Type may also affect the allowable selections in these same areas. For more details, see The Analysis Form (p. 8) in the MSC.Patran Reference Manual.

Main Index

Chapter 2: Building A Model 13 Introduction to Building a Model

Table 2-1 summarizes the various LS-DYNA commands supported by the Patran LS-DYNA Preference.

Table 2-1

Supported LS-DYNA Entities

CATEGORY

Main Index

KEYWORD

BOUNDARY

*BOUNDARY_SPC_SET *BOUNDARY_CYCLIC *BOUNDARY_PRESCRIBED_MOTION_SET *BOUNDARY_PRESCRIBED_MOTION_NODE

CONSTRAINED

*CONSTRAINED_EXTRA_NODES_SET *CONSTRAINED_GENERALIZED_WELD *CONSTRAINED_GENERALIZED_BUTT *CONSTRAINED_GENERALIZED_FILLET *CONSTRAINED_GENERALIZED_SPOT *CONSTRAINED_JOINT_SPHERICAL *CONSTRAINED_JOINT_REVOLUTE *CONSTRAINED_JOINT_CYLINDRICAL *CONSTRAINED_JOINT_PLANAL *CONSTRAINED_JOINT_UNIVERSAL *CONSTRAINED_JOINT_TRANSLATIONAL *CONSTRAINED_LINEAR *CONSTRAINED_NODAL_RIGID_BODY *CONSTRAINED_NODAL_RIGID_BODY_INERTIA *CONSTRAINED_RIVET *CONSTRAINED_SHELL_TO_SOLID *CONSTRAINED_SPOTWELD *CONSTRAINED_TIE-BREAK *CONSTRAINED_TIED_NODES_FAILURE

14 Patran Interface to LS-DYNA Preference Guide Introduction to Building a Model

Table 2-1

Supported LS-DYNA Entities

CATEGORY

Main Index

KEYWORD

CONTACT

*CONTACT_AUTOMATIC_ONE_WAY_SURFACE_TO_SURFACE *CONTACT_AUTOMATIC_SINGLE_SURFACE *CONTACT_AUTOMATIC_ SURFACE_TO_SURFACE *CONTACT_CONSTRAINT_NODES_TO_SURFACE *CONTACT_CONSTRAINT_SURFACE_TO_SURFACE *CONTACT_NODES_TO_SURFACE *CONTACT_ONE_WAY_SURFACE_TO_SURFACE *CONTACT_RIGID_BODY_ONE_WAY_TO_RIGID_BODY *CONTACT_RIGID_BODY_TWO_WAY_TO_RIGID_BODY *CONTACT_RIGID_NODES_TO_RIGID_BODY *CONTACT_SINGLE _SURFACE *CONTACT_SLIDNG_ONLY *CONTACT_SLIDING_ONLY_PENALTY *CONTACT_SURFACE_TO_SURFACE *CONTACT_TIEBREAK_NODES_TO_SURFACE *CONTACT_TIEBREAK_SURFACE_TO_SURFACE *CONTACT_TIED_NODES_TO_SURFACE *CONTACT_TIED_SURFACE_TO_SURFACE

CONTROL

*CONTROL_BULK-VISCOSITY *CONTROL_CPU *CONTROL_CONTACT *CONTROL_COUPLING *CONTROL_DYNAMIC_RELAXATION *CONTROL_ENERGY *CONTROL_HOURGLASS *CONTROL_OUTPUT *CONTROL_SHELL *CONTROL_TERMINATION *CONTROL_TIMESTEP

DAMPING

*DAMPING_GLOBAL *DAMPING_PART_MASS *DAMPING_PART_STIFFNESS

DATABASE

*DATABASE_BINARY_D3PLOT *DATABASE_BINARY_D3THDT *DATABASE_BINARY_XTFILE *DATABASE_EXTENT_BINARY *DATABASE_HISTORY_NODE *DATABASE_HISTORY_BEAM *DATABASE_HISTORY_SHELL *DATABASE_HISTORY_SOLID *DATABASE_HISTORY_TSHELL

Chapter 2: Building A Model 15 Introduction to Building a Model

Table 2-1

Supported LS-DYNA Entities

CATEGORY

Main Index

KEYWORD

DEFINE

*DEFINE_COORDINATE_SYSTEM *DEFINE_CURVE *DEFINE_SD_ORIENTATION

ELEMENT

*ELEMENT_BEAM *ELEMENT_DISCRETE *ELEMENT_MASS *ELEMENT_SHELL_THICKNESS *ELEMENT_SOLID_ORTHO *ELEMENT_TSHELL

INITIAL

*INITIAL_MOMENTUM *INITIAL_VELOCITY *INITIAL_VELOCITY_NODE

LOAD

*LOAD_BEAM_OPTION *LOAD_BODY_GENERALIZED *LOAD_NODE_OPTION *LOAD_SEGMENT *LOAD_SHELL _OPTION *LOAD_THERMAL_CONSTANT *LOAD_THERMAL_CONSTANT_NODE *LOAD_THERMAL_VARIABLE *LOAD_THERMAL_VARIABLE_NODE

16 Patran Interface to LS-DYNA Preference Guide Introduction to Building a Model

Table 2-1

Supported LS-DYNA Entities

CATEGORY

KEYWORD

MAT

*MAT_ELASTIC_OPTION *MAT_PLASTIC_KINEMATIC *MAT_VISCOELASTIC *MAT_BLATZ-KO_RUBBER *MAT_ISOTROPIC_ELASTIC_PLASTIC *MAT_SOIL_AND_FOAM *MAT_JOHNSON_COOK *MAT_STRAIN_RATE_DEPENDENT_PLASTICITY *MAT_RIGID *MAT_COMPOSITE_DAMAGE *MAT_ENHANCED_COMPOSITE_DAMAGE *MAT_PIECEWISE_LINEAR_PLASTICITY *MAT_HONEYCOMB *MAT_MOONEY-RIVLIN_RUBBER *MAT_RESULTANT_PLASTICITY *MAT_CLOSED_FORM_SHELL_PLASTICITY *MAT_FRAZER_NASH_RUBBER_MODEL *MAT_LAMINATED_GLASS *MAT_LOW_DENSITY_FOAM *MAT_COMPOSITE_FAILURE_MODEL *MAT_VISCOUS_FOAM *MAT_CRUSHABLE_FOAM *MAT_RATE_SENSITIVE_POWERLAW_PLASTICITY *MAT_LINEAR_ELASTIC_DISCRETE_BEAM *MAT_NONLINEAR_ELASTIC_DISCRETE_BEAM *MAT_NONLINEAR_PLASTIC_DISCRETE_BEAM *MAT_SID_DAMPER_DISCRETE_BEAM *MAT_SPRING_ELASTIC *MAT_DAMPER_VISCOUS *MAT_SPRING_ELASTOPLASTIC *MAT_SPRING_NONLINEAR_ELASTIC *MAT_DAMPER_NONLINEAR_VISCOUS *MAT_SPRING_GENERAL_NONLINEAR *MAT_SPRING_MAXWELL *MAT_SPRING_INELASTIC *MAT_SOIL_AND_FOAM_FAILURE

NODE

Gklab

PART

Gm^oq|lmqflk

RIGIDWALL

Gofdfat^ii|dbljbqof`|pbsbo^i=lmqflkp Gofdfat^ii|mi^k^o|pbsbo^i=lmqflkp

Main Index

Chapter 2: Building A Model 17 Introduction to Building a Model

Table 2-1

Supported LS-DYNA Entities

CATEGORY SECTION

KEYWORD Gpb`qflk|_b^j Gpb`qflk|afp`obqb Gpb`qflk|pebii Gpb`qflk|plifa|lmqflk Gpb`qflk|qpebii

SET

Gpbq|klab|lmqflk Gpbq|_b^j|lmqflk Gpbq|afp`obqb|lmqflk Gpbq|pbdjbkq Gpbq|pebii|lmqflk Gpbq|plifa|lmqflk Gpbq|qpebii|lmqflk

TITLE

Main Index

Gqfqib

18 Patran Interface to LS-DYNA Preference Guide Coordinate Frames

Coordinate Frames Coordinate frames will generate unique *DEFINE_COORDINATE_SYSTEM entries.

Only Coordinate Frames which are referenced by nodes, element properties, or loads and boundary conditions can be translated. For more information on creating coordinate frames see Creating Coordinate Frames (p. 393) in the Geometry Modeling - Reference Manual Part 2.

Main Index

Chapter 2: Building A Model 19 Finite Elements

Finite Elements Finite Elements in Patran allows the definition of basic finite element construction. Created under Finite Elements are the=åçÇÉë, element topology, and multi-point constraints.

For more information on how to create finite element meshes, see Mesh Seed and Mesh Forms (p. 25) in the Reference Manual - Part III.

Main Index

20 Patran Interface to LS-DYNA Preference Guide Finite Elements

Nodes Nodes in Patran will generate unique *NODE entries. Nodes can be created either directly using the Node object, or indirectly using the Mesh object.

Main Index

Chapter 2: Building A Model 21 Finite Elements

Elements Finite Elements in Patran assigns element connectivity, such as Quad/4, for standard finite elements. The type of LS-DYNA element created is not determined until the element properties are assigned. See the Element Properties Form for details concerning the LS-DYNA element types. Elements can be created either directly using the Element object or indirectly using the Mesh object.

Main Index

22 Patran Interface to LS-DYNA Preference Guide Finite Elements

Multi-Point Constraints Multi-point constraints (MPCs) can also be created from the Finite Elements menu. These elements define a rigorous behavior between several specified nodes. The forms for creating MPCs are found by selecting MPC as the Object on the Finite Elements form. The full functionality of the MPC forms are defined in Create Action (Mesh) (p. 11) in the Reference Manual - Part III.

Main Index

Chapter 2: Building A Model 23 Finite Elements

MPC Types To create an MPC, first select the type of MPC to be created from the option menu. The MPC types that appear in the option menu are dependent on the current settings of the Analysis Code and Analysis Type preferences. The following table describes the MPC types which are supported for LS-DYNA.

MPC Type

Analysis Type

Description

Tied Shell to Solid

Structural

Defines a tie between a shell edge and solid elements.

Rivet

Structural

Defines pairs of nodes representing a rivet connection.

Cyclic

Structural

Describes cyclic symmetry boundary conditions for a segment of the model.

Explicit

Structural

Creates a constraint equation between one degree of freedom of one node and selected degrees of freedom of other nodes.

Spherical Joint

Structural

Creates a spherical joint between two rigid bodies.

Revolute Joint

Structural

Creates a revolute joint between two rigid bodies.

Cylindrical Joint

Structural

Creates a cylindrical joint between two rigid bodies.

Planar Joint

Structural

Creates a planar joint between two rigid bodies.

Universal Joint

Structural

Creates a universal joint between two rigid bodies.

Symmetry

Translational Joint Structural Extra Nodes

Structural

Creates a translational joint between two rigid bodies. Defines extra nodes for a rigid body. These are mainly used in conjunction with joint definition.

Note that the LS-DYNA definition of joints requires the definition of coincident pairs of nodes. Coincidence is not required of the Patran model. The mean position will be calculated during translation. Note that some of the LS-DYNA *CONSTRAINED entries are supported as LBC’s rather than MPC’s. This is generally because they require more data than can be entered for an MPC or for the sake of consistency with other analysis preferences. Degrees-of-Freedom Whenever a list of degrees-of-freedom is expected for an MPC term, a listbox containing the valid degrees-of-freedom is displayed on the form. A degree-of-freedom is valid if: 1. It is valid for the current Analysis Code Preference. 2. It is valid for the current Analysis Type Preference. 3. It is valid for the selected MPC type.

Main Index

24 Patran Interface to LS-DYNA Preference Guide Finite Elements

In most cases, all degrees-of-freedom, which are valid for the current Analysis Code and Analysis Type Preferences, are valid for the MPC type. The following degrees-of-freedom are supported for the various analysis types:

Degree-of-freedom

Analysis Type

UX

Structural

UY

Structural

UZ

Structural

RX

Structural

RY

Structural

RZ

Structural

Note:

Care must be taken to make sure that a degree-of-freedom that is selected for an MPC actually exists at the nodes. For example, a node that is attached only to solid structural elements will not have any rotational degrees-of-freedom. However, Patran will allow you to select rotational degrees-of-freedom at this node when defining an MPC.

Tied Shell to Solid

This subordinate MPC form appears when the Define Terms button is selected on the Finite Elements form, and the tied shell to solid type is selected. This form is used to create a *CONSTRAINED_SHELL_TO_SOLID entry. Note that a shell node may be tied to up to 9 brick nodes lying along a tangent vector to the nodal fiber. Nodes can move relative to each other in the fiber direction only.

Main Index

Chapter 2: Building A Model 25 Finite Elements

Main Index

26 Patran Interface to LS-DYNA Preference Guide Finite Elements

Rivet

This subordinate MPC form appears when the Define Terms button is selected on the Finite Elements form, and the Rivet type is selected. This form is used to create one or more *CONSTRAINED_RIVET entries. Note that nodes connected by a rivet cannot be members of another constraint set that constrains the same degree of freedom, a tied interface, or a rigid body.

Main Index

Chapter 2: Building A Model 27 Finite Elements

Explicit

This subordinate MPC form appears when the Define Terms button is selected on the Finite Elements form, and Explicit is the selected type. This form is used to create a *CONSTRAINED_LINEAR entry. This MPC type is used to define a linear constraint equation.

Main Index

28 Patran Interface to LS-DYNA Preference Guide Finite Elements

Joint MPCs

This subordinate MPC form appears when the Define Terms button is selected on the Finite Elements form, and one of the joint types is selected. This form is used to create a *CONSTRAINED_JOINT_TRANSLATIONAL entry. The Relative Penalty Stiffness for this entry is defined on the main MPC form. The form will differ slightly for the 6 joint types. The spherical type requires only one dependent and one independent node. The translational joint requires 3 dependent and 3 independent nodes, and the other joint types require 2 dependent and 2 independent nodes.

Main Index

Chapter 2: Building A Model 29 Finite Elements

Extra Nodes MPCs

This subordinate MPC form appears when the Define Terms button is selected on the Finite Elements form, and the Extra Nodes type is selected. This form is used to create a *CONSTRAINED_EXTRA_NODES_OPTION NODE/SET entry. This is the standard Rigid (Fixed) MPC type of Patran.

Main Index

30 Patran Interface to LS-DYNA Preference Guide Material Library

Material Library The Materials form will appear when the Material toggle, located on the Patran application selections, is chosen. The selections made on the Materials menu will determine which material form appears, and ultimately, which LS-DYNA material will be created. The following pages give an introduction to the Materials form, and details of all the material property definitions supported by the Patran LS-DYNA preference. Only material records which are referenced by an element property region or by a laminate lay-up will be translated. References to externally defined materials will result in special comments in the LS-DYNA input file, with material data copied from user identified files. This reference allows a user not only to insert material types that are not supported directly by the LS-DYNA preference, but also to make use of a standard library of materials.

Main Index

Chapter 2: Building A Model 31 Material Library

Materials Form This form appears when Materials is selected on the main menu. The Materials form is used to provide options to create the various LS-DYNA materials.

Main Index

32 Patran Interface to LS-DYNA Preference Guide Material Library

The following table outlines the options when Create is the selected Action.

Object Isotropic

Option 1

Option 2

• Linear Elastic

• Linear Elastic (MAT 1)

• Elastoplastic

• Plastic Kinematic (MAT 3) • Iso. Elasto Plastic (MAT 12) • Strain Rate Dependent (MAT 19) • Piecewise Linear (MAT 24) • Rate Sensitive (MAT 64) • Resultant (MAT 28) • Closed Form (MAT 30)

• Viscoelastic

• Viscoelastic (MAT 6)

• Rigid

• Material Type 20

• Johnson Cook

• Material Type 15

• Rubber

• Frazer Nash (MAT 31) • Blatz-Ko (MAT 7) • Mooney Rivlin (MAT 27) • Soil and Foam (MAT 5/14)

• Foam

• Viscous Foam (MAT 62) • Crushable Foam (MAT 63) • Low Density Urethane (MAT 57)

2D Orthotropic

• Glass (laminated)

• Laminate Glass (MAT 32)

3D Orthotropic

• Honeycomb

• Composite Honeycomb (MAT 26)

• Composite

• Composite Damage (MAT 22) • Composite Failure (MAT 59)

Composite

• Laminate

Isotropic Linear Elastic

This subordinate form appears when the Input Properties button is selected on the Materials form when Isotropic is the selected Object, and when Linear Elastic is the selected Constitutive Model on the Input Options form.

Main Index

Option 1

Option 2

Option 3

Linear Elastic

Linear Elastic (MAT1)

Solid Fluid

Chapter 2: Building A Model 33 Material Library

Use this form to define the data for LS-DYNA Material Type 1 (*MAT_ELASTIC). If the “Material” is set as “Fluid” the parameters required are: Density, Bulk Modulus, Viscosity Coefficient, and Cavitation Pressure.

Elastoplastic

This subordinate form appears when the Input Properties button is selected on the Materials form, when Isotropic is the selected object, Elastoplastic is the selected Constitutive Model, and the following is the selected Implementation.

Main Index

Option 1

Option 2

Elastoplastic

Plastic Kinematic (MAT 3)

34 Patran Interface to LS-DYNA Preference Guide Material Library

Use this form to define the data for LS-DYNA Material Type 3 (*MAT_PLASTIC_KINEMATIC).

Elastoplastic

This subordinate form appears when the Input Properties button is selected on the Materials form, when Isotropic is the selected object, Elastoplastic is the selected Constitutive Model, and the following is the selected Implementation.

Main Index

Option 1

Option 2

Elastoplastic

Isotropic Elastic Plastic

Chapter 2: Building A Model 35 Material Library

Use this form to define the data for LS-DYNA Material Type 12 (*MAT_ISOTROPIC_ELASTIC_PLASTIC).

Main Index

36 Patran Interface to LS-DYNA Preference Guide Material Library

Elastoplastic

This subordinate form appears when the Input Properties button is selected on the Materials form, when Isotropic is the selected object, Elastoplastic is the selected Constitutive Model, and the following is the selected Implementation.

Option 1

Option 2

Elastoplastic

Strain Rate Dependent Plasticity

Use this form to define the data for LS-DYNA Material Type 19 (*MAT_STRAIN_RATE_DEPENDENT_PLASTICITY).

Main Index

Chapter 2: Building A Model 37 Material Library

Elastoplastic

This subordinate form appears when the Input Properties button is selected on the Materials form, when Isotropic is the selected object, and one of the following combinations is selected.

Option 1

Option 2

Option 3

Option 4

Elastoplastic

Piecewise Linear Plasticity

Bilinear

Cowper Symonds Rate Model General Rate Model

Linearized

Cowper Symonds Rate Model General Rate Model

Use the form on the next page to define the data for LS-DYNA Material Type 24 (*MAT_PIECEWISE_LINEAR_PLASTICITY). The contents of the form will vary depending upon which option is selected. If the bilinear option is selected then the tangent modulus is required. The linearized option requires definition of a strain dependent field. If the General rate model is selected instead of the Cowper Symonds model then the Yield Stress is defined as a strain rate dependent field.

Main Index

38 Patran Interface to LS-DYNA Preference Guide Material Library

Main Index

Chapter 2: Building A Model 39 Material Library

Elastoplastic

This subordinate form appears when the Input Properties button is selected on the Materials form, when Isotropic is the selected object, Elastoplastic is the selected Constitutive Model, and the following is the selected Implementation.

Option 1

Option 2

Elastoplastic

Rate Sensitive Power Law

Use this form to define the data for LS-DYNA Material Type 64 (*MAT_RATE_SENSITIVE_POWERLAW_PLASTICITY).

Main Index

40 Patran Interface to LS-DYNA Preference Guide Material Library

Elastoplastic

This subordinate form appears when the Input Properties button is selected on the Materials form, when Isotropic is the selected object, Elastoplastic is the selected Constitutive Model, and the following is the selected Implementation.

Option 1

Option 2

Elastoplastic

Resultant

Use this form to define the data for LS-DYNA Material Type 28 (*MAT_RESULTANT_PLASTICITY).

Main Index

Chapter 2: Building A Model 41 Material Library

Elastoplastic

This subordinate form appears when the Input Properties button is selected on the Materials form, when Isotropic is the selected object, Elastoplastic is the selected Constitutive Model, and the following is the selected Implementation.

Main Index

Option 1

Option 2

Elastoplastic

Closed Form Shell

42 Patran Interface to LS-DYNA Preference Guide Material Library

Use this form to define the data for LS-DYNA Material Type 30 (*MAT_CLOSED_FORM_SHELL_PLASTICITY).

Main Index

Chapter 2: Building A Model 43 Material Library

Viscoelastic

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, and the Viscoelastic Constitutive model is selected. Use this form to define the data for LS-DYNA Material Type 6 (*MAT_VISCOELASTIC).

Main Index

44 Patran Interface to LS-DYNA Preference Guide Material Library

Rigid

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, and the Rigid Constitutive model is selected. Use this form to define the data for LS-DYNA Material Type 20 (*MAT_RIGID).

Main Index

Chapter 2: Building A Model 45 Material Library

Johnson Cook

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, and one of the following combinations is selected.

Main Index

Option 1

Option 2

Option 3

Option 4

Johnson Cook

Material Type 15

No Iterations

Minimum Pressure No tension, Minimum Stress No tension, Minimum Pressure

Accurate

Minimum Pressure No tension, Minimum Stress No tension, Minimum Pressure

46 Patran Interface to LS-DYNA Preference Guide Material Library

Use the form on the next page to define the data for LS-DYNA Material Type 15 (*MAT_JOHNSON_COOK). The contents of the form do not vary.

Additional data for this form are: Effective Plastic Strain rate, Specific Heat, Failure Stress/Pressure, and 5 Failure Parameters.

Main Index

Chapter 2: Building A Model 47 Material Library

Rubber

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, Rubber is the selected Constitutive Model, and the following is the selected Implementation.

Option 1

Option 2

Rubber

Blatz-Ko

Use this form to define the data for LS-DYNA Material Type 7 (*MAT_BLATZ-KO_RUBBER).

Main Index

48 Patran Interface to LS-DYNA Preference Guide Material Library

Rubber

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, Rubber is the selected Constitutive Model, and the following is the selected Implementation. Option 1

Option 2

Option 3

Rubber

Mooney Rivlin

Coefficients Least Square

Use this form to define the data for LS-DYNA Material Type 27 (*MAT_MOONEY_RIVLIN_RUBBER).

Main Index

Chapter 2: Building A Model 49 Material Library

Rubber

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, Rubber is the selected Constitutive Model, and one of the following combinations is selected.

Option 1

Option 2

Option 3

Option 4

Rubber

Frazer-Nash

Coefficients

Respect Ignore

Least Squares Fit

Respect Ignore

Use the form on the next page to define the data for LS-DYNA Material Type 31 (*MAT_FRAZER_NASH_RUBBER_MODEL). The contents of the form varies depending on the option selected for defining the material response. If the model is defined as least squares fit then specimen data and a field defining force versus change in gauge length are required instead of the coefficients that appear on the form below. Note that a strain field must be defined, although this is interpreted by the translator as force versus actual change in the gauge length. If the strain limits are to be ignored then maximum and minimum strain limits are not required.

Main Index

50 Patran Interface to LS-DYNA Preference Guide Material Library

Main Index

Chapter 2: Building A Model 51 Material Library

Foam

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, Foam is the selected Constitutive Model, and one of the following combinations is selected.

Option 1

Option 2

Option 3

Option 4

Foam

Low Density Urethane

Bulk Viscosity Inactive

No Tension Maintain Tension

Bulk Viscosity Active

No Tension Maintain Tension

Use the form on the next page to define the data for LS-DYNA Material Type 57 (*MAT_LOW_DENSITY_FOAM). The contents of the form does not vary.

Main Index

52 Patran Interface to LS-DYNA Preference Guide Material Library

Main Index

Chapter 2: Building A Model 53 Material Library

Foam

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, Foam is the selected Constitutive Model, and the following is the selected Implementation.

Option 1

Option 2

Foam

Viscous Foam

Use this form to define the data for LS-DYNA Material Type 62 (*MAT_VISCOUS_FOAM).

Main Index

54 Patran Interface to LS-DYNA Preference Guide Material Library

Foam

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, Foam is the selected Constitutive Model, and the following is the selected Implementation.

Option 1

Option 2

Foam

Crushable

Use this form to define the data for LS-DYNA Material Type 63 (*MAT_CRUSHABLE_FOAM).

Main Index

Chapter 2: Building A Model 55 Material Library

Foam

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, Foam is the selected Constitutive Model, and one of the following combinations is selected.

Option 1

Option 2

Option 3

Option 4

Foam

Soil and Foam

Inactive Inactive Active Active

Allow Crushing Reversible Allow Crushing Reversible

Use the form on the next page to define the data for LS-DYNA Material Type 5 (*MAT_SOIL_AND_FOAM) or Material Type 14 (*MAT_SOIL_AND_FOAM_FAILURE). Choice between the Type 5 and Type 14 is solely on the basis of whether failure is permitted when pressure meets the failure pressure.

Main Index

56 Patran Interface to LS-DYNA Preference Guide Material Library

2D Orthotropic Laminated Glass

This subordinate form appears when the Input Properties button is selected on the Materials form, 2D Orthotropic is the Selected Object, and when Laminated Glass is the selected Constitutive Model on the Input Options form. Use this form to define the data for LS-DYNA Material Type 32 (*MAT_LAMINATED_GLASS).

Main Index

Chapter 2: Building A Model 57 Material Library

3D Orthotropic Honeycomb

This subordinate form appears when the Input Properties button is selected on the Materials form when 3D Orthotropic is selected on the Material form, and when the Honeycomb Constitutive model is

Main Index

58 Patran Interface to LS-DYNA Preference Guide Material Library

selected. Use this form to define the data for LS-DYNA Material Type 26 (*MAT_HONEYCOMB).

Main Index

Chapter 2: Building A Model 59 Material Library

Composite

This subordinate form appears when the Input Properties button is selected on the Materials form when 3D Orthotropic is the selected Object, Composite is the Selected Constitutive Model, and the following is the selected Implementation.

Option 1

Option 2

Composite

Damage

Use the subordinate form on the following page to define the data for LS-DYNA Material Type 22 (*MAT_COMPOSITE_DAMAGE).

Main Index

60 Patran Interface to LS-DYNA Preference Guide Material Library

Composite Failure

This subordinate form appears when the Input Properties button is selected on the Materials form, 3D Orthotropic is the selected Object, Composite is the Selected Constitutive Model, and the following is the selected Implementation.

Main Index

Option 1

Option 2

Option 3

Composite

Failure

Ellipsoidal Faceted

Chapter 2: Building A Model 61 Material Library

Use the subordinate form on the following page to define the data for LS-DYNA Material Type 58 (*MAT_COMPOSITE_FAILURE_MODEL).

Main Index

62 Patran Interface to LS-DYNA Preference Guide Element Properties

Element Properties The Element Properties form appears when the Properties toggle, located on the Patran main form, is chosen.There are several option menus available when creating element properties. The selections made on the Element Properties menu will determine which element property form appears, and ultimately, which LS-DYNA element will be created. The following pages give an introduction to the Element Properties form, and details of all the element property definitions supported by the Patran LS-DYNA Preference.

Element Properties Form This form appears when Properties is selected on the main menu. There are four option menus on this form, each will determine which LS-DYNA element type will be created and which property forms will appear. The individual property forms are documented later in this section. For a full description of this form, see Element Properties Forms (p. 67) in the Patran Reference Manual.

Main Index

Chapter 2: Building A Model 63 Element Properties

Main Index

64 Patran Interface to LS-DYNA Preference Guide Element Properties

The following table outlines the option menus when Analysis Type is set to Structural.

Object 0D

1D

Type

Option 1

Option 2

• Mass • Grounded Spring

Linear Non-Linear Elastoplastic General Non-Linear Viscoelastic Inelastic

• Grounded Damper

Linear Non-Linear

• Beam

General Section Dimensioned Section

• Rod • Spring

• Damper

Linear

Scalar Follower

Non-linear

Scalar Follower

Elastoplastic

Scalar Follower

General Non-Linear

Scalar Follower

Viscoelastic

Scalar Follower

Inelastic

Scalar Follower

Linear

Scalar Follower

Non-Linear

Scalar Follower

Side Impact

Main Index

• Discrete beam

Linear Non-Linear Non-Linear Plastic

• Weld

Spot

•

Fillet

Standard General

Chapter 2: Building A Model 65 Element Properties

Object

2D

Type

Option 1

Option 2

•

Butt

• Integrated Beam

Rectangular

Hughes Liu Belytschko Schwer

Tubular

Hughes Liu Belytschko Schwer

• Part Inertia 1D

General Section Dimensioned Beam

• Shell

Homogeneous

Hughes Liu Belytschko Tsay BCIZ Tri Shell Co Tri S/R Hughes Liu S/R Co-rotational Belytschko Levialthan Bely Wong Chiang Fast Hughes Liu

Laminate

Hughes Liu S/R Hughes Liu Fast Hughes Liu Default

• Membrane

Bely T Membrane Fully Integrated

• Part Inertia 2D

3D

• Solid

Constant Stress S/R 8 Node Quadratic 8 Node S/R Tetrahedron

• Thick Shell

1 Point 2 x 2 point

• Part Inertia 3D

Mass This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Main Index

Action

Dimension

Type

Topologies

Create

0D

Mass

Point

66 Patran Interface to LS-DYNA Preference Guide Element Properties

Use this form to create an *ELEMENT_MASS entry. This defines a lumped mass element of the structural model.

Grounded Spring This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Option(s)

Topologies

Create

0D

Grounded Spring

Linear, Non-Linear, Elastoplastic, General Non-Linear, Viscoelastic, Inelastic

Point/1

Use this form to create a *ELEMENT_DISCRETE entry and one of the *MAT_SPRING_type and *SECTION_DISCRETE data entries. This defines a scalar spring element of the structural model. Only one node is used in this method. The other node is defined to be grounded. The data on this form will vary upon the spring type.

Main Index

Chapter 2: Building A Model 67 Element Properties

Grounded Damper This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Option(s)

Topologies

Create

0D

Grounded Damper

Linear/Non-Linear

Point/1

Use this form to create an *ELEMENT_DISCRETE entry=and one of the *MAT_DAMPER_type and *SECTION_DISCRETE data entries. This defines a scalar damper element of the structural model. Only one node is used in this method. The other node is defined to be grounded.The data on this form will vary upon the damper type.

Main Index

68 Patran Interface to LS-DYNA Preference Guide Element Properties

Beam (General Section) This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Option(s)

Create

1D

Beam

General Section

Option 2

Topologies Bar/2

Use this form to create an *ELEMENT_BEAM entry together with its associated *SECTION_BEAM and *INTEGRATION_BEAM data entry. This defines a simple beam element of the structural model.

Main Index

Chapter 2: Building A Model 69 Element Properties

This is a list of Input Properties, available for creating a resultant beam that were not shown on the previous page. Use the menu scroll bar on the input properties form to view these properties.

Property Name

Description

Axial Damping

Defines the axial damping factor. This property is optional.

Mass Damping

Defines the mass damping factor. This property is optional.

Stiffness Damping

Defines the stiffness damping factor. This property is optional.

Bending Damping

Defines the bending damping factor. This property is optional.

Beam (Dimensioned Section - Hughes-Liu) This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Main Index

Action

Dimension

Type

Option(s)

Option 2

Topologies

Create

1D

Beam

Dimensioned Section

Hughes -Liu

Bar/2

70 Patran Interface to LS-DYNA Preference Guide Element Properties

Use this form to create an *ELEMENT_BEAM entry together with its associated *SECTION_BEAM and *INTEGRATION_BEAM data entry. This defines a simple beam element of the structural model.

This is a list of Input Properties, available for creating a resultant beam that were not shown on the previous page. Use the menu scroll bar on the input properties form to view these properties.

Property Name

Main Index

Description

Mass Damping

Defines the mass damping factor. This property is optional.

Stiffness Damping

Defines the stiffness damping factor. This property is optional.

Chapter 2: Building A Model 71 Element Properties

Beam (Dimensioned Section - Belytschko-Schwer) This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Option(s)

Option 2

Topologies

Create

1D

Beam

Dimensioned Section

Belytschko Schwer

Bar/2

Use this form to create an *ELEMENT_BEAM entry together with its associated *SECTION_BEAM and *INTEGRATION_BEAM data entry. This defines a simple beam element of the structural model.

Main Index

72 Patran Interface to LS-DYNA Preference Guide Element Properties

This is a list of Input Properties, available for creating a resultant beam that were not shown on the previous page. Use the menu scroll bar on the input properties form to view these properties.

Property Name

Description

Axial Damping

Defines the axial damping factor. This property is optional.

Mass Damping

Defines the mass damping factor. This property is optional.

Stiffness Damping

Defines the stiffness damping factor. This property is optional.

Bending Damping

Defines the bending damping factor. This property is optional.

Rod This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Create

1D

Rod

Option(s)

Topologies Bar/2

Use this form to create *ELEMENT_BEAM and *SECTION_BEAM data entries. This defines a tension-compression-torsion element of the structural model.

Main Index

Chapter 2: Building A Model 73 Element Properties

Scalar Spring This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Option 1

Option 2 Topologies

Create

1D

Spring

Linear, Non-Linear, Elastopastic, General Non-Linear, Viscoelastic, Inelastic

Scalar,

Bar/2

Use this form to create an *ELEMENT_DISCRETE entry and one of the *MAT_SPRING_type and *SECTION_DISCRETE data entries. This defines a scalar spring element of the structural model. The data on this form will vary upon the spring type. Additional parameters are available to define the dynamic values based on static data.

Main Index

74 Patran Interface to LS-DYNA Preference Guide Element Properties

Scalar Damper This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Main Index

Action

Dimension

Type

Option 1

Option 2

Topologies

Create

1D

Damper

Linear, Non-Linear

Scalar

Bar/2

Chapter 2: Building A Model 75 Element Properties

Use this form to create an *ELEMENT_DISCRETE entry and one of the *MAT_DAMPER_type and *SECTION_DISCRETE data entries. This defines a scalar damper element of the structural model. The data on this form will vary upon the damper type.

Follower Damper This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Main Index

Action

Dimension

Type

Option 1

Option 2

Topologies

Create

1D

Damper

Linear, Non-Linear

Follower

Bar/2

76 Patran Interface to LS-DYNA Preference Guide Element Properties

Use this form to create an *ELEMENT_DISCRETE entry and one of the *MAT_DAMPER_type and *SECTION_DISCRETE data entries. This defines a follower damper element of the structural model. The data on this form will vary upon the damper type.

Side Impact Damper This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Option

Topologies

Create

1D

Damper

Side Impact

Bar/2

Use this form to create an *ELEMENT_BEAM entry and *MAT_SID_DAMPER_DISCRETE_BEAM and *SECTION_BEAM data entries. This defines a side impact damper element of the structural model. Additional properties required to fully define the damper behavior are input by scrolling down the form.

Main Index

Chapter 2: Building A Model 77 Element Properties

Discrete Beam This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension Type

Option(s)

Topologies

Create

1D

Linear, Non-Linear, Non-Linear Plastic

Bar/2

Discrete Beam

Use this form to create an *ELEMENT_BEAM entry together with its associated *MAT_type_DISCRETE_BEAM and *SECTION_BEAM data entries. This defines a simple beam element of the structural model. The data on this form will vary upon the beam type.

Main Index

78 Patran Interface to LS-DYNA Preference Guide Element Properties

Spot Weld This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Option 1

Option 2

Topologies

Create

1D

Weld

Spot

Standard/General

Bar/2

Use this form to create a *CONSTRAINED_SPOTWELD or *CONSTRAINED_GENERALIZED_WELD_SPOT entry. This defines a spot weld connecting two nodes of the model. The data on this form will vary upon the weld type.

Main Index

Chapter 2: Building A Model 79 Element Properties

Fillet Weld This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Option(s)

Topologies

Create

1D

Weld

Fillet

Bar/2

Use this form to create a *CONSTRAINED_GENERALIZED_WELD_FILLET entry. This defines a fillet weld between two parts of the model.

Main Index

80 Patran Interface to LS-DYNA Preference Guide Element Properties

This is a list of Input Properties available for creating a Fillet Weld that were not shown on the previous page. Use the scroll bar on the Input properties form to view these properties.

Property Name

Main Index

Description

Width of Flange, w

Define width of flange. This property is required.

Width of Weld, a

Define width of fillet weld. This property is required.

Weld Angle, Alpha

Define the weld angel, Alpha. This property is required.

Chapter 2: Building A Model 81 Element Properties

Butt Weld This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Option(s)

Topologies

Create

1D

Weld

Butt

Bar/2

Use this form to create a *CONSTRAINED_GENERALIZED_WELD_BUTT entry. This defines a butt weld between two parts of the model.

Main Index

82 Patran Interface to LS-DYNA Preference Guide Element Properties

Integrated Beam This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Option 1

Option 2

Topologies

Create

1D

Integrated Beam

Rectangular, Tubular

Belytschko Schwer, Hughes -Liu

Bar/2

Use this form to create an *ELEMENT_BEAM together with its associated *SECTION_BEAM and *INTEGRATION_BEAM data entries. This defines a simple beam element of the structural model. The data entry will vary upon the formulation option.

Main Index

Chapter 2: Building A Model 83 Element Properties

Part Inertia 1D This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Create

1D

Part Inertia 1D

Option 1

Option 2

Topologies Bar/2

Use this form to create an *ELEMENT_BEAM together with its associated *SECTION_BEAM and *INTEGRATION_BEAM data entries. This defines a simple beam element of the structural model. The data entry will vary upon the formulation option.

Main Index

84 Patran Interface to LS-DYNA Preference Guide Element Properties

Shell This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Option

Formulation

Topologies

Create

2D

Shell

Homogeneous

Hughes Liu, Belytschko-Tsay, Tri/3, Quad/4 BCIZ Tri Shell, Co-Tri, S/R Hughes Lui, S/R Co_rotational, Belytschko Levialthan, Bely Wong Chiang, Fast Hughes Liu.

Laminate

Hughes Liu, S/R Hughes Liu, Fast Hughes Liu, Default.

Use this form to create an *ELEMENT_SHELL_OPTION entry together with the associated *SECTION_SHELL entry. The data varies upon the type of element formulation.

Main Index

Chapter 2: Building A Model 85 Element Properties

Membrane This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Option(s)

Topologies

Create

2D

Membrane

Bely T Membrane, Fully Integrated

Tria/3, Quad/4

Use this form to create an *ELEMENT_SHELL_OPTION entry together with the associated *SECTION_SHELL entry.

Main Index

86 Patran Interface to LS-DYNA Preference Guide Element Properties

Part Inertia 2D This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Create

2D

Part Inertia 2D

Option 1

Option 2

Topologies Bar/2

Use this form to create an *ELEMENT_BEAM together with its associated *SECTION_BEAM and *INTEGRATION_BEAM data entries. This defines a simple beam element of the structural model. The data entry will vary upon the formulation option.

Main Index

Chapter 2: Building A Model 87 Element Properties

Solid This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Option 1

Topologies

Create

3D

Solid

Constant Stress, S/R 8 Node, Quadratic 8 Node, S/R Tetrahedron

Hex/8

Use this form to create an *ELEMENT_SOLID entry together with the associated *SECTION_SOLID entry.

Main Index

88 Patran Interface to LS-DYNA Preference Guide Element Properties

Thick Shell This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Action

Dimension

Type

Option 1

Topologies

Create

3D

Thick Shell

1 Point 2x2 Point

Hex/8

Use this form to create an *ELEMENT_TSHELL entry together with the associated *SECTION_TSHELL entry.

Main Index

Chapter 2: Building A Model 89 Element Properties

Note:

The correct node numbering is essential for correct use. To ensure proper orientation, extreme care must be used in defining the connectivity. (See the LS-DYNA User’s Manual for further details.)

Part Inertia 3D This subordinate form appears when the Input Properties button is selected on the Element Properties form when the following options are chosen.

Main Index

Action

Dimension

Type

Create

3D

Part Inertia 3D

Option 1

Option 2

Topologies Bar/2

90 Patran Interface to LS-DYNA Preference Guide Element Properties

Use this form to create an *ELEMENT_BEAM together with its associated *SECTION_BEAM and *INTEGRATION_BEAM data entries. This defines a simple beam element of the structural model. The data entry will vary upon the formulation option.

Main Index

Chapter 2: Building A Model 91 Loads and Boundary Conditions

Loads and Boundary Conditions The Loads and Boundary Conditions form will appear when the Loads/BCs toggle, located on the Patran application selections, is chosen. When creating a loads and boundary conditions there are several option menus. The selections made on the Loads and Boundary Conditions menu will determine which loads and boundary conditions form appears, and ultimately, which LS-DYNA loads and boundary conditions will be created. The following pages give an introduction to the Loads and Boundary Conditions form, and details of all the loads and boundary conditions supported by the Patran LS-DYNA Analysis Preference.

Main Index

92 Patran Interface to LS-DYNA Preference Guide Loads and Boundary Conditions Form

Loads and Boundary Conditions Form This form appears when Loads/BCs is selected on the main form. The Loads and Boundary Conditions form is used to provide options to create the various LS-DYNA loads and boundary conditions. For a definition of full functionality, see Loads and Boundary Conditions Form (p. 27) in the Patran Reference Manual.

Main Index

Chapter 2: Building A Model 93 Loads and Boundary Conditions Form

The following table outlines the options when Create is the selected action.

Object

Type

Displacement

Nodal

Force

Nodal

Pressure

Element Uniform

Temperature

Nodal

Initial Velocity

Nodal

Velocity

Nodal

Acceleration

Nodal

Initial Momentum

Element Uniform

Contact

Element Uniform

Geometric Rigid Wall

Nodal

Planar Rigid Wall

Nodal

Tied Shells

Element Uniform

Tied Shell Edges

Element Uniform

Nodal Rigid Body

Nodal

Nodal Inertial Load

Nodal

Static (Not Time Varying)

This subordinate form appears when the Input Data button is selected on the Loads and Boundary Conditions form when the Current Load Case Type is Static. The Current Load Case Type is set on the Load Case form, for more information see Loads and Boundary Conditions Form. The information on the Input Data form will vary depending on the selected Object. Defined below is the standard information found on this form. Note that this form is not used with the LS-DYNA Preference.

Main Index

94 Patran Interface to LS-DYNA Preference Guide Loads and Boundary Conditions Form

Transient (Time Varying)

This subordinate form appears when the Input Data button is selected on the Loads and Boundary Condition form when the Current Load Case Type is Time Dependent. The Current Load Case Type is set on the Load Case form, for more information see Loads and Boundary Conditions Form and Load Cases. The information on the Input Data form will vary, depending on the selected Object. Defined below is the standard information found on this form.

Main Index

Chapter 2: Building A Model 95 Loads and Boundary Conditions Form

Contact Toolkit

Introduction This section describes the user interface provided by Patran to access the contact features of explicit dynamics finite element codes. This interface is used during definition of the Contact LBC types: Self Contact, Master/Slave Surface, Master/Slave Node, and Subsurface.

Main Index

96 Patran Interface to LS-DYNA Preference Guide Loads and Boundary Conditions Form

Tools have been provided to enable the user to quickly and easily define contact conditions. Specification of contact is conceptually simple, involving either one or two contact surfaces, and a set of contact parameters which control the interaction of the surfaces. Contact Types A contact condition in which a single logical surface may come into contact only with itself is described as self-contact, and requires the specification of a single Application Region. A contact condition in which two logical surfaces may contact each other is described as Master/Slave contact, and requires specification of two Application Regions. Master/Slave contact is further subdivided by the definition of Master/Slave Surface and Master/Slave Node. Master/Slave Surface describes the condition in which both the master and slave surfaces are described using element faces, whereas Master/Slave Node describes the condition in which the Slave surface is described using only nodes. Contact Construction Tools are provided to enable the construction of contact surfaces, using the standard Patran select tool mechanisms (2D elements, 3D element faces), or groups. Contact subsurfaces can also be constructed using these tools, and later used to define a complete logical contact surface. This functionality allows the user to use the select tool to specify application regions on Patran geometry or the associated FEM entities or to define a more complex contact surface that is assembled from a mixture of 2D and 3D element faces, and to simply combine groups of 2D elements taking into account the direction of the contact outward normal. (For 2D elements, the outward normal can be reversed for contact purposes without modifying the underlying element topology.) Use of the group select mechanism is restricted to FEM entities only. Visualization of the specified contact condition is provided by graphically previewing but is not currently supported for geometry entities. “Simple” contact surfaces include surfaces which may be described entirely by the faces of 3D elements, or by 2D elements whose outward normals are aligned with the desired contact normal direction. These contact surfaces may be constructed entirely using a single select mechanism (either Select Tool or Group method). Simple contact surfaces may not include a mixture of 3D element faces and 2D elements, or 2D elements whose outward normals are not all aligned with the desired contact normal direction. “Complex” contact surfaces are defined as those surfaces which consist of a mixture of 2D elements and 3D element faces, or all 2D elements but with some of the outward normal incorrectly aligned. Contact conditions which include complex contact surfaces must be constructed using “Subsurfaces,” where each subsurfaces is a “Simple” contact surface. Definition of contact surfaces is limited to one method; i.e., it is not permissible to mix “Select Tool,” “Group,” or “Subsurface” within the definition of a contact surface. The following section describes how each of the contact surface creation methods is used to describe a simple contact surface. Use of the Select Tool The select tool is use to graphically select the desired entities from the model. When this method is selected, the user must specify which dimensionality the intended object has, i.e. 3D, 2D or Nodal. If the selected dimensionality is 2D, then the user can further specify whether the top, bottom or both surfaces

Main Index

Chapter 2: Building A Model 97 Loads and Boundary Conditions Form

are required. Selection of top will result in a contact surface whose outward normal is coincident with the element outward, whereas selection of bottom will result in a contact surface whose outward normal is in the opposite direction to the element outward normal. The user can toggle between Top, Bottom or Both at any time during selection, however all of the selected entities will be assigned the same logical direction. Selection of 3D allows the user to select either all or all free faces of 3D elements. No user specification of the contact normal direction is required for 3D elements since the program automatically specifies this direction. No contact direction is applicable to Nodal contact surfaces. It is not permissible to mix 3D, 2D and Nodal entities within a single Application Region. (This functionality is provided through the use of contact subsurfaces). The select tool can be used to select on the basis of either FEM or Geometry entities. Use of the Group Tool The Group tool is used to define simple contact surfaces on the basis of Patran group names. When this method is selected, the user must specify which dimensionality the intended object has, i.e. either 3D, 2D or Nodal. The entities which will be selected for use in the contact surface in this case are either all 3D free surfaces in the group, all 2D elements or all nodes contained in the selected group. In the case of 2D elements, the user may specify whether the contact normal direction is coincident with the element top, bottom or both faces. Multiple groups may be selected. However, it should be noted that both the selected element dimensionality and contact normal direction apply across all selected groups. Use of the Subsurface Tool Contact Subsurfaces may be defined using either of the above methods. Subsurfaces may then be used in the specification of Master, Slave or Self contact surfaces. When this option is used, the user may not specify element dimensionality or contact normal direction since this information has already been defined during subsurface definition. As many sub-surfaces as required may be selected to form the desired complex contact subsurface. Contact: Application Region This form is used to define contact surfaces. The form will vary depending upon which options are selected, however two basic configurations are used depending on whether the contact condition requires specification of a single contact surface or two contact surfaces.

Main Index

98 Patran Interface to LS-DYNA Preference Guide Loads and Boundary Conditions Form

Single Application Region

The following form is used to define a single surface contact or a subsurface.

Main Index

Chapter 2: Building A Model 99 Loads and Boundary Conditions Form

Dual Application Region

The following form is used to define either of the master-slave contact types.

Main Index

100 Patran Interface to LS-DYNA Preference Guide Loads and Boundary Conditions Form

Contact: Input Data

The Input Data form is used to specify parameters which control the behavior of the contact condition. The contents of the form will vary depending upon which option is selected. No Input Data is required for the Subsurface option since subsurfaces do not constitute a contact condition on their own.

Object Tables There are areas on the static and transient input data forms where the load data values are defined. The data fields which appear depend on the selected load Object and Type. In some cases, the data fields also depend on the selected Target Element Type. The following Object Tables outline and define the various input data that pertains to a specific selected object:

Main Index

Chapter 2: Building A Model 101 Loads and Boundary Conditions Form

Displacement

Object

Type

Analysis Type

Displacement

Nodal

Structural

If the displacement/rotational component is zero, it will result in generation of a *BOUNDARY_SPC_OPTION NODE/SET entry, which defines translational and rotational constraints in the prescribed coordinate system. If the values are non-zero then this will result in generation of a *BOUNDARY_PRESCRIBED_MOTION_OPTION NODE/SET entry.

Input Data

Description

Translations (T1,T2,T3)

Defines the enforced translational displacement values in the specified coordinate system. These are in model length units.

Rotations (R1,R2,R3)

Defines the enforced rotational displacement values in the specified coordinate system. These are in degrees.

Force

Object

Type

Analysis Type

Force

Nodal

Structural

This defines a *LOAD_NODE_OPTION POINT/SET entry. For transient load cases an auxiliary *DEFINE_CURVE entry is defined from the time dependent field selected.

Input Data

Description

Force (F1,F2,F3)

Defines the applied forces in the translation degrees-of-freedom in the specified coordinate system.

Moment (M1,M2,M3)

Defines the applied moments in the rotational degrees-of-freedom in the specified coordinate system.

Pressure

Object

Type

Analysis Type

Dimension

Pressure

Element Uniform

Structural

2D

Creates a *LOAD_SHELL_OPTION ELEMENT/SET entry depending upon whether one or more shell elements are selected.

Main Index

102 Patran Interface to LS-DYNA Preference Guide Loads and Boundary Conditions Form

Input Data

Description

Top Surf Pressure

Defines the top surface pressure load on shell elements.

Bot Surf Pressure

Defines the bottom surface pressure load on shell elements.

Edge Pressure

Defines the edge pressure load on shell elements.

Object

Type

Analysis Type

Dimension

Pressure

Element Uniform

Structural

3D

Creates a *LOAD_SEGMENT.

Input Data Pressure

Description Defines the face pressure value on solid elements. If a spacial field is referenced, it will be evaluated once at the center of the applied region.

Temperature

Object

Type

Analysis Type

Temperature

Nodal

Structural

When the load case type is static this creates a *LOAD_THERMAL_CONSTANT or a *LOAD_THERMAL_CONSTANT_NODE entry depending upon the application region. When the load case type is transient this creates a *LOAD_THERMAL_VARIABLE or a *LOAD_THERMAL_VARIABLE_NODE entry depending upon the application region.

Input Data Temperature

Description Defines the temperature which will be constant if the load case is static or scaled by the load curve if the load curve is transient.

Initial Velocity

Main Index

Object

Type

Analysis Type

Initial Velocity

Nodal

Structural

Chapter 2: Building A Model 103 Loads and Boundary Conditions Form

Creates a *INITIAL_VELOCITY or *INITIAL_VELOCITY_NODE entry (The latter when there is only a single node). The exempted node option is not supported for the former entry as Patran provides more natural methods of defining nodal sets. Note that is an Analysis coordinate frame is specified the values are transformed into the global coordinates system.

Input Data

Description

Trans Veloc (v1,v2,v3)

Defines the Velocity fields for translational degrees-of-freedom.

Rot Veloc (w1,w2,w3)

Defines the Velocity fields for rotational degrees-of-freedom.

Velocity

Object

Type

Analysis Type

Velocity

Nodal

Structural

If the load case type is transient this will result in generation of a *BOUNDARY_PRESCRIBED_MOTION_OPTION NODE/SET entry. There is no corresponding data for static load cases.

Input Data

Description

Trans Veloc(v1,v2,v3)

Defines the enforced translational velocity values in the specified coordinate system. These are in model length units per unit time.

Rot Veloc (w1,w2,w3)

Defines the enforced rotational velocity values in the specified coordinate system. These are in degrees per unit time.

Acceleration

Object

Type

Analysis Type

Acceleration

Nodal

Structural

If the load case type is transient this will result in generation of a *BOUNDARY_PRESCRIBED_MOTION_OPTION NODE/SET entry. There is no corresponding data for static load cases.

Main Index

104 Patran Interface to LS-DYNA Preference Guide Loads and Boundary Conditions Form

Input Data

Description

Trans Accel (A1,A2,A3)

Defines the enforced translational acceleration values in the specified coordinate system. These are in model length units per unit time squared.

Rot Accel (a1,a2,a3)

Defines the enforced rotational acceleration values in the specified coordinate system. These are in degrees per unit time squared.

Initial Momentum

Object

Type

Analysis Type

Dimension

Initial Momentum

Element Uniform

Structural

3D

Creates a *INITIAL_MOMENTUM entry. Note that global coordinates apply only. This applies only for solid elements.

Input Data

Description

Momentum (m1,m2,m3)

Defines the Velocity fields for translational degrees-of-freedom.

Deposition Time

Time at which energy is deposited in solid elements.

Contact

Four types of contact exist. Three of these are complete definitions and have associated input data. The fourth is the subsurface type which is used to define part of a contacting surface. Object Contact

Main Index

Type Element Uniform

Option 1 Self Contact Subsurface Master-Slave Srrface Master-Slave Node

Chapter 2: Building A Model 105 Loads and Boundary Conditions Form

The contact options for each of the contact types are defined in the following table.

Input Data Contact Type

Contact Method

Constraint (Only available when Contact Method = Constrain) Thickness definition Surface Behavior Small penetration check Interface output

Main Index

Option Single Surface (4) Surface to Surface (3) One-way Surface to Surface(10) Tied surface to Surface (2) Tie break Surface to Surface(9) Sliding Only (1) Sliding Only Penalty (p1) Rigid Body One way(21) Rigid body Two way(19) Nodes to Surface (5) Tied nodes to Surface (6) Tie break Nodes to Surface (8) Rigid Nodes to Body(20) Automatic Standard Constrain Fully Symmetric Constrain to Slave Constrain to Master Define Scale Penalty Soft-Constraint On Off Diagonal None Slave Master Both

Self Contact x

Master Slave Surface

Master Slave Node

x x x x x x x x

x x

x x x x x x

x x x x x x x x x x

x x x x x x x x x

x x x x x x x x x x x

x x x x x x x x x x x

106 Patran Interface to LS-DYNA Preference Guide Loads and Boundary Conditions Form

The contact input parameters are defined in the following table.

Input Data Static Friction Coefficient Dynamic Friction Coefficient Exponential Decay Coefficient Viscous Friction Coefficient Viscous Damping Coefficient Birth Time Death Time Scale Factor on Slave Stiffness Scale Factor on Master Stiffness Master Surface Thickness Slave Thickness Scale Factor Scale Factor to Constraint Forces Max. Param Coord in Search Cycles between Bucket Sorts Cycle between Force Updates Maximum Penetration

Self Contact x x x x x x x x

x x x x

Master Slave Surface x x x x x x x x x x x x x x

x

Geometric Rigid Wall

Object

Type

Analysis Type

Planar Rigid Wall

Nodal

Structural

Four types of geometric rigid wall exist: 1. Flat 2. Prismatic 3. Cylindrical 4. Spherical The options are as follows: 1. Motion: Static/Defined Velocity/Defined Displacement 2. Friction: Frictionless/No Slip/Frictional

Main Index

Master Slave Node x x x x x x x x x x x x x x

Chapter 2: Building A Model 107 Loads and Boundary Conditions Form

The input data for geometric rigid walls are as follows:

Input Data

Description

Friction Coefficient

For frictional behavior only.

Length of l (x) edge

Applies for prism cylindrical and flat surface.

Length of m (y) edge

Applies for prism and flat surface.

Length n (z)

Applies for prism.

Radius

Applies for cylinder and sphere.

Motion Time History

Defines motion in the coordinate system of the geometric entity. Applies for moving walls only.

Note that the user must select a local coordinate system that is used when generating the geometry of the wall. The local z axis is always the n axis in the LS-DYNA definition. The velocity is defined as a time field in the local z direction. Planar Rigid Wall

Object

Type

Analysis Type

Planar Rigid Wall

Nodal

Structural

Two types of planar rigid wall exist: 1. Finite 2. Infinite The options are as follows: 1. Motion: Static/Moving 2. Friction: No Slip/Frictionless/Isotropic Frictional/Orthotropic Frictional Note that the orthotropic frictional behavior is available only for a static rigid wall. The input data for planar walls is as follows:

Input Data

Main Index

Description

Friction Coefficient(s)

Only for Isotropic & Orthotropic frictional (Option 2)

Mass

Only for moving walls.

Initial Velocity (Vo)

Only for moving walls (Option 1). Defined relative to the local coordinate system used to define the wall.

108 Patran Interface to LS-DYNA Preference Guide Loads and Boundary Conditions Form

Input Data

Description

Length of l (x) Edge

Length of the l edge of a finite plane.

Length of m (y) Edge

Length of the m edge of a finite plane.

Note that the user must select a local coordinate system that is used when generating the geometry of the wall. The local z axis is always the n axis in the LS-DYNA definition. The velocity is defined as a time field in the local z direction. Tied Shells

Object

Type

Analysis Type

Dimension

Tied Shell Nodes

Element Uniform

Structural

2D

This defines a *CONSTRAINED_TIED_NODES_FAILURE data entry. Edges of shell elements be selected.

Input Data

Description The tied nodes, which must be coincident at the corners of each shell, separate when the average weighted plastic strain reaches this value.

Plastic Strain at Failure

Tied Shell Edges

Object

Type

Analysis Type

Dimension

Tied Shell Nodes

Element Uniform

Structural

Dual Application

This defines a *CONSTRAINED_TIE-BREAK data entry. This requires a dual application region. Both master (primary) and slave (secondary) must be the edges of shells.

Input Data Plastic Strain at Failure

Description The tied nodes separate when the average weighted plastic strain reaches this value.

Nodal Rigid Body

Main Index

Object

Type

Analysis Type

Nodal Rigid Body

Nodal

Structural

Chapter 2: Building A Model 109 Loads and Boundary Conditions Form

This defines a *CONSTRAINED_NODAL_RIGID_BODY entry. Note that the user must define a local coordinate system with origin at (0,0,0) on the wall and x direction normal to the wall and pointing into the body. The option INERTIA will be generated if the second or third of the following options are selected: 1. Computed (no input data required) 2. Defined Globally 3. Defined Locally (Local analysis coordinate frame selected). The input data is tabulated below.

Input Data

Description

Mass

Translational mass of rigid body.

Inertia Ixx

xx component of inertia tensor.

Inertia Ixy

Not required if a local coordinate system is defined.

Inertia Ixz

Not required if a local coordinate system is defined.

Inertia Iyy

yy component of inertia tensor.

Inertia Iyz

Not required if a local coordinate system is defined.

Inertia Izz

zz component of inertia tensor.

Trans. Veloc (v1,v2,v3)

Translational velocity.

Rot Veloc (w1,w2,w3)

Rotational velocity.

Nodal Inertial Load

Object

Type

Analysis Type

Nodal Inertial Load

Nodal

Structural

Creates *LOAD_BODY_OPTION or *LOAD_BODY_GENERALIZED entries depending upon whether the condition is applied to the complete body or some subset of the body. Note that only one scale factor can be applied to the loads. Note also that the selected coordinate system defines the centre of rotation for angular velocity.

Input Data

Main Index

Description

Trans Accel (A1,A2,A3)

Defines the base acceleration.

Rot Velocity (w1,w2,w3)

Defines the angular velocity.

110 Patran Interface to LS-DYNA Preference Guide Load Cases

Load Cases Load cases in Patran are used to group a series of load sets into one load environment for the model. Load cases are selected when preparing an analysis, not load sets. The usage for LS-DYNA is consistent, however only one loadcase can be selected for translation. For information on how to define static and/or transient load cases, see Overview of the Load Cases Application (p. 162) in the Patran Reference Manual.

Main Index

Chapter 3: Running an Analysis Patran Interface to LS-DYNA Preference Guide

3

Main Index

Running an Analysis 

Review of the Analysis Form



Translation Control



Solution Parameters



Select Load Case



Output Requests



Output Controls



Select Groups for Set Cards

112

115 116 123 124

133 134

112 Patran Interface to LS-DYNA Preference Guide Review of the Analysis Form

Review of the Analysis Form The Analysis form appears when the Analysis toggle, located on the Patran switch, is chosen. To run an analysis, or to create an LS-DYNA input file, select Analyze as the Action on the Analysis form. Other forms brought up by the Analysis form are used to define and control the analysis to be conducted and to set global defaults, where appropriate. These forms are described on the following pages. For further information see The Analysis Form (p. 8) in the MSC.Patran Reference Manual.

Main Index

Chapter 3: Running an Analysis 113 Review of the Analysis Form

Analysis Form This form appears when the Analysis toggle is chosen on the main form. When preparing for an analysis run, select Analyze as the Action.

Main Index

114 Patran Interface to LS-DYNA Preference Guide Review of the Analysis Form

The following table outlines the selections for the Analyze action.

Object

Method

Entire Model

Analysis Deck Full Run

Select Group

Analysis Deck Full Run

The Object indicates which part of the model is to be analyzed. • Entire Model is selected if the whole model is to be analyzed. • Select Group allows one or more groups to be selected from a form and written to the deck.

The Method indicates how far the translation is to be taken. • Analysis Deck is selected if an analysis file translation is to be done, plus all load case, analysis

type and analysis parameter data are to be translated. A complete input file, ready for LS-DYNA, should be generated. • Full Run is selected if, in addition to writing an analysis file, LS-DYNA is to be executed.

Main Index

Chapter 3: Running an Analysis 115 Translation Control

Translation Control The translation parameters form allows the user to control the manner in which the LS-DYNA input file is generated.

Main Index

116 Patran Interface to LS-DYNA Preference Guide Solution Parameters

Solution Parameters The solution parameters form provides access to subordinate forms upon which are defined the parameters controlling execution of an LS-DYNA analysis.

Main Index

Chapter 3: Running an Analysis 117 Solution Parameters

Solution Control The solution control subordinate form defines data to be written to the *CONTROL_CPU, *CONTROL_TERMINATION and *CONTROL_TIMESTEP entries.

Main Index

118 Patran Interface to LS-DYNA Preference Guide Solution Parameters

Relaxation Parameters The solution control subordinate form defines data to be written to the *CONTROL_DYNAMIC RELAXATION entry.

Main Index

Chapter 3: Running an Analysis 119 Solution Parameters

Global Damping The solution control subordinate form defines data to be written to the *DAMPING_GLOBAL entry with defines mass weighted nodal damping that applies globally to all deformable bodies.

Material Viscosity Defaults The solution control subsidiary form defines data to be written to the *CONTROL_BULK_VISCOSITY and *CONTROL_HOURGLASS entries.

Main Index

120 Patran Interface to LS-DYNA Preference Guide Solution Parameters

Energy Calculation The solution control subsidiary form defines data to be written to the *CONTROL_ENERGY entry.

Main Index

Chapter 3: Running an Analysis 121 Solution Parameters

Shell Control The solution control subsidiary form defines data to be written to the *CONTROL_SHELL entry.

Main Index

122 Patran Interface to LS-DYNA Preference Guide Solution Parameters

Contact Defaults The solution control subsidiary form defines data to be written to the *CONTROL_CONTACT entry.

Main Index

Chapter 3: Running an Analysis 123 Select Load Case

Select Load Case This form appears when the Select Load Case button is selected on the Analysis form. Use this form to select the load case to be included in this run.

Main Index

124 Patran Interface to LS-DYNA Preference Guide Output Requests

Output Requests This form allows the definition of what results data is desired from the analysis code. The settings can be accepted, as altered, by selecting the OK button on the bottom of the form. If the Cancel button is selected instead, the form will be closed without any of the changes being accepted. Selecting the Defaults button resets the form to the initial default settings.

Main Index

Chapter 3: Running an Analysis 125 Output Requests

The following table outlines the selections for the Results Types and selection possibilities.

Object Binary State File

*DATABASE_BINARY_D3PLOT *DATABASE_EXTENT_BINARY

Binary History File

*DATABASE_BINARY_D3THDT *DATABASE_BINARY_XTFILE *DATABASE_HISTORY_BEAM *DATABASE_HISTORY_NODE *DATABASE_HISTORY_SHELL *DATABASE_HISTORY_SOLID *DATABASE_HISTORY_TSHELL *DATABASE_SECFORC *DATABASE_CROSS_SECTION_SET *DATABASE_RWFORC *DATABASE_GLSTAT *DATABASE_SSSTAT *DATABASE_EXTENT_SSSTAT *DATABASE_DEFORC *DATABASE_MATSUM *DATABASE_NCFORC *DATABASE_RCFORC *DATABASE_DEFGEO *DATABASE_SPCFORC *DATABASE_SWFORC *DATABASE_ABSTAT *DATABASE_NODFOR *DATABASE_BNDOUT *DATABASE_RBDOUT *DATABASE_GCEOUT *DATABASE_SLEOUT *DATABASE_JNTFORC *DATABASE_SBTOUT *DATABASE_AVSFLT *DATABASE_EXTENT_AVS *DATABASE_MOVIE *DATABASE_EXTENT_MOVIE *DATABASE_MPGS *DATABASE_EXTENT_MPGS *DATABASE_TRHIST *DATABASE_TRACER *DATABASE_TPRINT

Cross Section Forces

Wall Forces Global Data Subsystem Data Discrete Elements Material Energies Nodal Interface Force Result Interface Force Deformed Geo File SPC Reaction Force Nodal Const Reaction Air Bag Statistics Nodal Force Group BC Forces and Energy Rigid Body Data Geo Contact Entities Sliding Int Energy Joint Force File Seat Belt Output AVS Database Movie MPGS Trace Particle History Thermal Output

Main Index

Type

126 Patran Interface to LS-DYNA Preference Guide Output Requests

To define the *DATABASE_EXTENT_BINARY entry associated with a *DATABASE_BINARY_D3PLOT record the following subordinate form is used. This form is invoked when Input Data is selected and Binary State File is the active Result Type. Note that the first data item, “Exclude Discrete Springs and Dampers” is written to the *DATABASE_BINARY_D3PLOT record.

Main Index

Chapter 3: Running an Analysis 127 Output Requests

To define the *DATABASE_HISTORY_option entry associated with a *DATABASE_BINARY_D3THDT record the following subordinate form is used. This form is invoked when Input Data is selected and Binary History File is the active Result Type. Note that the last data item, “Extra Time History Data” results in generation of a *DATABASE_BINARY_XTFILE record.

Main Index

128 Patran Interface to LS-DYNA Preference Guide Output Requests

To define the *DATABASE_CROSS_SECTION_SET entry associated with a *DATABASE_SECFORC record, the following subordinate form is used. This form is invoked when Input Data is selected and Cross Section Forces is the active Result Type.

Main Index

Chapter 3: Running an Analysis 129 Output Requests

To define the *DATABASE_OPTION entry, the following subordinate form is used, when Input Data is selected and one of the following options is the active Result type: Wall Forces, Global Data, Discrete Element Material Energies, Nodal Interface Force, Result Interface force, Deformed Geo File, SPC Reaction Force, Nodal Const. Reaction, Air Bag Statistics, Nodal force group, Geo contact entities, Sliding Int Energy, Joint Force file, Seat Belt output, Thermal Output.

To define the *DATABASE_EXTENT_OPTION entry associated with a *DATABASE_OPTION record, the following subordinate form is used,. This form is invoked when Input Data is selected and AVS Database,Movie or MPGs is the active Result Type.

Main Index

130 Patran Interface to LS-DYNA Preference Guide Output Requests

To define the *DATABASE_TRACER entry associated with a *DATABASE_TRHIST record, the following subordinate form is used,. This form is invoked when Input Data is selected and Trace Particle History is the active Result Type.

Table 3-1 Variable Type Nodal

Brick Element

Main Index

Component Number 1-3 4-6 7-9 10 1 2 3 4 5 6 7

Quantity x,y,z-displacements x,y,z-velocities x,y,z-accelerations temperature x-stress y-stress z-stress xy-stress yz-stress zx-stress effective plastic strain

Chapter 3: Running an Analysis 131 Output Requests

Table 3-1

(continued)

Variable Type Beam element

Shell and Thick Shell

Main Index

Component Number 1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Quantity x-force resultant y-force resultant z-force resultant x-moment resultant y-moment resultant z-moment resultant midsurface x-stress midsurface y-stress midsurface z-stress midsurface xy-stress midsurface yz-stress midsurface zx-stress midsurface effective plastic strain innersurface x-stress innersurface y-stress innersurface z-stress innersurface xy-stress innersurface yz-stress innersurface zx-stress innersurface effective plastic strain outer surface x-stress outer surface y-stress outer surface z-stress outer surface xy-stress outer surface yz-stress outer surface zx-stress outer surface effective plastic strain bending moment-mxx (4-node shell) bending moment -myy(4-node shell) bending moment-mxy (4-node shell) shear resultant-qxx (4-node shell) shear resultant-qyy (4-node shell) normal resultant-nxx (4-node shell) normal resultant-nxx (4-node shell) normal resultant-nxy (4-node shell) thickness

132 Patran Interface to LS-DYNA Preference Guide Output Requests

Table 3-1

(continued)

Variable Type Shell and Thick Shell (continued)

Main Index

Component Number 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

Quantity element dependent variable element dependent variable innersurface x-stress innersurface y-stress innersurface z-stress innersurface xy-stress innersurface yz-stress innersurface zx-stress outer surface x-stress outer surface y-stress outer surface z-stress outer surface xy-stress outer surface yz-stress outer surface zx-stress internal energy midsurface effective stress inner surface effective stress outer surface effective stress midsurface max. principal strain through thickness strain midsurface min. principal strain lowersurface effective strain lowersurface max. principal strain through thickness strain lower surface min.principal strain lowersurface effective strain lower surface min.principal strain through thickness strain upper surface max.principal strain upper surface effective strain

Chapter 3: Running an Analysis 133 Output Controls

Output Controls This form provides control over data generated during execution. Most of this data is entered on the *CONTROL_OUTPUT entry. The settings can be accepted, as altered, by selecting the OK button on the bottom of the form. If the Cancel button is selected instead, the form will be closed without any of thechanges being accepted. Selecting the Defaults button resets the form to the default settings.

Main Index

134 Patran Interface to LS-DYNA Preference Guide Select Groups for Set Cards

Select Groups for Set Cards The Select Group for Set Cards form allows you to select any of the groups in the model and write them to the deck.

Main Index

Chapter 3: Running an Analysis 135 Setting LSDYNA IDs

Setting LSDYNA IDs Normally the LSDYNA ID is set using the corresponding Patran entity ID. EG If a material is created that has a Patran ID of 1, then the ID of 1 will be used for the LSDYNA *MAT card in the deck. However, the user can set the ID by using the naming convention "Name.ID" for the Patran entity. This applies for materials, property sets, fields and LBCs. If, for example, the user wants to manually set the IDs of the materials, then he/she must make sure that every Patran material name is followed by a unique ID ( 0 is not allowed ). Otherwise the IDs will not be changed. When the IDs are changed, a message is printed by the translator to the xterm.

Main Index

136 Patran Interface to LS-DYNA Preference Guide Setting LSDYNA IDs

Main Index

Chapter 4: Read Results Patran Interface to LS-DYNA Preference Guide

4

Main Index

Read Results 

Review of the Read Results Form



Subordinate Forms



Results Created in Patran



Results File Size

141

145

144

138

138 Patran Interface to LS-DYNA Preference Guide Review of the Read Results Form

Review of the Read Results Form The Analysis form will appear when the Analysis toggle, located on the Patran control panel, is chosen. Read State File, as the selected Action on the Analysis form, allows the model and/or results data to be accessed from within Patran or read into the Patran database, from an LS-DYNA State file. Subordinate forms of the Analysis form define the data to be accessed, and the files from which to fetch the data. These forms are described on the following pages.

Main Index

Chapter 4: Read Results 139 Review of the Read Results Form

Read Results Form Setting the Action option menu to Read State File indicates that results are to be accessed.

Main Index

140 Patran Interface to LS-DYNA Preference Guide Review of the Read Results Form

Options on the Read Results Form The following table defines the options that can be exercised from the Read Results Form.

Action Read State File

Object Results Entities

Method

Subsidiary Forms

Attach

Select State File

Translate

Select State File Select Times Select Results

Model Data Both

Attach

Select State File

Translate

Select State File

Attach

Select State File

Translate

Select State File Select Times Select Results

Main Index

Chapter 4: Read Results 141 Subordinate Forms

Subordinate Forms The subordinate forms accessed from the “Read Results Form” will depend upon the “Action” and “Object” selected. The various possibilities are described in this subsection.

Select State File Subordinate Form The subordinate State file selection form allows the user to select a LS-DYNA state file from which data is to be extracted.

Querying State File There is no subordinate y form associated with querying the state file. The query is done automatically once the user has selected the state file. The data returned is required by the subsequent forms.

Main Index

142 Patran Interface to LS-DYNA Preference Guide Subordinate Forms

Select Times The subordinate “Select Times” form allows the user to select the cycle(s) for which results are to be imported from a state file (“Translate” method only).

Main Index

Chapter 4: Read Results 143 Subordinate Forms

Select Results The subordinate “Select Results” form allows the user to select the results to be imported (“Translate” method only). When results are being imported from a history file the entity selection acts as a filter on the information imported.

Main Index

144 Patran Interface to LS-DYNA Preference Guide Results Created in Patran

Results Created in Patran The following table indicates all the possible results quantities which can be loaded into the Patran database from an LS-DYNA state file. Table 4-1

Results Supported During Model Importation

Primary Label

Main Index

Type

Description

Displacement

Nodal

x, y, z displacements of nodes, in global coordinate frame.

Velocity

Nodal

x, y, z velocity of nodes, in global coordinate frame.

Acceleration

Nodal

x, y, z acceleration of nodes, in global coordinate frame.

Temperature

Nodal

Nodal temperature.

Forces

Nodal

Resultant beam forces and moments, in local beam coordinates.

Stress

Element

6 components of stress tensor, at element centre and gaussian points - top, middle, and bottom for shells.

Stress Resultants

Element

Stress Resultants at elements

Strain

Element

6 components of strain tensor, at element centre and gaussian points - top, middle, and bottom for shells.

Eff. Plastic Strain

Element

Effective plastic strain, at element centre and gaussian points top, middle, and bottom for shells.

Chapter 4: Read Results 145 Results File Size

Results File Size The default results file size for Patran LS-DYNA is 7 Megabytes. If the results have been created using a different file size, then an environment variable must be set in the Patran shell before reading the results. This environment variable is ’FAM_SIZE’. This should be calculated as follows: 1. Find the biggest ".ptf" results file, and divide its size in bytes by 1MB (1048576 bytes). If this gives an exact result, use that, otherwise round up by one. 2. Set the environment variable accordingly prior to running the translator. Thus if the file size is 24819794 bytes, this gives 23.67MB, thus setenv FAM_SIZE 24

(C Shell syntax)

FAM_SIZE=24; export FAM_SIZE (Bourne/Korn shell syntax) Note:

Main Index

The ‘FAM_SIZE’ environment variable is not needed with the “Attach” method, which is designed to work with arbitrary file sizes.

146 Patran Interface to LS-DYNA Preference Guide Results File Size

Main Index

Chapter 5: Read Input File Patran Interface to LS-DYNA Preference Guide

5

Main Index

Read Input File 

Review of Read Input File Form



Data Translated from the LS-DYNA Input File



Reject and Error File

156

148 152

148 Patran Interface to LS-DYNA Preference Guide Review of Read Input File Form

Review of Read Input File Form The Analysis form will appear when the Analysis toggle, located on the Patran main form, is chosen.

Read Input File as the selected Action on the Analysis form allows some of the model data from an LSDYNA input file to be translated into the Patran database. A subordinate File Selection form allows the user to specify the LS-DYNA input file to translate.

Main Index

Chapter 5: Read Input File 149 Review of Read Input File Form

Read Input File Form This form appears when the Analysis toggle is selected on the main form. Read Input File, as the selected Action, specifies that model data is to be translated from the specified LS-DYNA input file into the Patran database.

Main Index

150 Patran Interface to LS-DYNA Preference Guide Review of Read Input File Form

Selection of Input File This subordinate form appears when the Select Input File button is selected on the Analysis form when Read Input File is the selected Action. It allows the user to specify which LS-DYNA input file to translate.

Main Index

Chapter 5: Read Input File 151 Review of Read Input File Form

Set Card Read Options This subordinate form appears when the Set Card Read Option button is selected on the Analysis form when Read Input File is the selected action. It allows you to specify which set of cards of the LS-DYNA input file to translate.

Main Index

152 Patran Interface to LS-DYNA Preference Guide Data Translated from the LS-DYNA Input File

Data Translated from the LS-DYNA Input File The Patran LSDYNA3D input file translator currently translates the model topology, some materials and some properties from an input file. The following is a list of the data supported. Table 5-1

Input File Translation Data

Category BOUNDARY

CONSTRAINED

CONTACT

Keyword *BOUNDARY_CYCLIC

*BOUNDARY_PRESCRIBED_MOTION_SET

*BOUNDARY_PRESCRIBED_MOTION _NODE

*BOUNDARY_SPC_SET

*CONSTRAINED_EXTRA_NODES_SE T *CONSTRAINED_GENERALIZED_WE LD_BUTT *CONSTRAINED_GENERALIZED_WE LD_FILLET *CONSTRAINED_GENERALIZED_WE LD_SPOT *CONSTRAINED_JOINT_ *CONSTRAINED_JOINT_CYLINDRIAL *CONSTRAINED_JOINT_PLANAR *CONSTRAINED_JOINT_REVOLUTE *CONSTRAINED_JOINT_SPHERICAL

*CONSTRAINED_JOINT_TRANSLATIONAL *CONSTRAINED_JOINT_UNIVERSAL *CONSTRAINED_LINEAR *CONSTRAINED_NODAL_RIGID_BODY *CONSTRAINED_NODAL_RIGID_BODY_INERTA *CONSTRAINED_RIVET *CONSTRAINED_SHELL_TO_SOLID *CONSTRAINED_SPOTWELD *CONSTRAINED_TIED_NODES_FAILURE

*CONTACT_AUTOMATIC_ONE_WAY_ *CONTACT_CONSTRAINT_SURFACE_TO_SURFA SURFACE_TO_SURFACE CE *CONTACT_AUTOMATIC_SINGLE_SU *CONTACT_NODES_TO_SURFACE RFACE *CONTACT_ONE_WAY_SURFACE_TO_SURFACE *CONTACT_AUTOMATIC_SURFACE_ TO_SURFACE *CONTACT_RIGID_NODES_TO_RIGID_BODY *CONTACT_AUTOMATIC_NODES_TO _SURFACE *CONTACT_CONSTRAINT_NODES_T O_SURFACE

CONTROL

*CONTACT_TIEBREAK_NODES_TO_SURFACE *CONTACT_TIED_NODES_TO_SURFACE

*CONTROL_BULK_VISCOSITY

*CONTROL_HOURGLASS

*CONTROL_CPU

*CONTROL_OUTPUT

*CONTROL_CONTACT

*CONTROL_SHELL

*CONTROL_COUPLING

*CONTROL_TERMINATION

*CONTROL_DYNAMIC_RELAXATION *CONTROL_TIMESTEP *CONTROL_ENERGY

DAMPING

*DAMPING_GLOBAL

*DAMPING_PART_STIFFNESS

*DAMPING_PART_MASS

Note: The Property and Material ID in the analysis file are used as a numeric extension to the Property Set name and Material name in the Patran database.

Main Index

Chapter 5: Read Input File 153 Data Translated from the LS-DYNA Input File

Table 5-1

Input File Translation Data (continued)

Category DATABASE

DEFINE

Keyword *DATABASE_ABSTAT

*DATABASE_TPRINT

*DATABASE_AVSFLT

*DATABASE_TRHIST

*DATABASE_BNDOUT

*DATABASE_RBDOUT

*DATABASE_DEFGEO

*DATABASE_RWFORC

*DATABASE_DEFORC

*DATABASE_BINARY_D3PLOT

*DATABASE_GCEOUT

*DATABASE_BINARY_D3THDT

*DATABASE_GLSTAT

*DATABASE_BINARY_XTFILE

*DATABASE_JNTFORC

*DATABASE_CROSS_SECTION_SET

*DATABASE_MATSUM

*DATABASE_EXTENT_AVS

*DATABASE_MOVIE

*DATABASE_EXTENT_BINARY

*DATABASE_MPGS

*DATABASE_EXTENT_MOVIE

*DATABASE_NCFORC

*DATABASE_EXTENT_MPGS

*DATABASE_RWFORC

*DATABASE_EXTENT_SSSTAT

*DATABASE_SBTOUT

*DATABASE_HISTORY_BEAM

*DATABASE_SECFORCE

*DATABASE_HISTORY_NODE

*DATABASE_SLEOUT

*DATABASE_HISTORY_SHELL

*DATABASE_SPCFORC

*DATABASE_HISTORY_SOLID

*DATABASE_SSSTAT

*DATABASE_HISTORY_TSHELL

*DATABASE_SWRFORC

*DATABASE_TRACER

*DEFINE_COORDINATE_NODES

*DEFINE_SD_ORIENTATION

*DEFINE_COORDINATE_SYSTEM

*DEFINE_VECTOR

*DEFINE_CURVE

ELEMENT

END

*ELEMENT_BEAM

*ELEMENT_SHELL

*ELEMENT_BEAM_THICKNESS

*ELEMENT_SHELL_THICKNESS

*ELEMENT_DISCRETE

*ELEMENT_SOLID

*ELEMENT_MASS

*ELEMENT_SOLID_ORTHO

*ELEMENT_SHELL_BETA

*ELEMENT_TSHELL

*END

Note: The Property and Material ID in the analysis file are used as a numeric extension to the Property Set name and Material name in the Patran database.

Main Index

154 Patran Interface to LS-DYNA Preference Guide Data Translated from the LS-DYNA Input File

Table 5-1

Input File Translation Data (continued)

Category INITIAL

Keyword *INITIAL_MOMENTUM

*INITIAL_VELOCITY_NODE

*INITIAL_VELOCITY

LOAD

*LOAD_BODY_GENERALIZED

*LOAD_SHELL_SET

*LOAD_NODE_POINT

*LOAD_THERMAL_CONSTANT

*LOAD_NODE_SET

*LOAD_THERMAL_CONSTANT_NODE

*LOAD_SEGMENT

*LOAD_THERMAL_VARIABLE

*LOAD_SEGMENT_SET

*LOAD_THERMAL_VARIABLE_NODE

*LOAD_SHELL_ELEMENT

MAT

*MAT_BLATZ-KO_RUBBER

*MAT_NONLINEAR_PLASTIC_DISCRETE_BEAM

*MAT_CLOSED_FORM_SHELL_PLAS TICITY

*MAT_PIECEWISE_LINEAR_PLASTICITY

*MAT_COMPOSITE_DAMAGE *MAT_COMPOSITE_FAILURE_MODE L *MAT_CRUSHABLE_FOAM *MAT_ELASTIC *MAT_ELASTIC_FLUID *MAT_FRAZER_NASH_RUBBER_MO DEL *MAT_HONEYCOMB

*MAT_PLASTIC_KINEMATIC *MAT_RATE_SENSITIVE_POWERLAW_PLASTICI TY *MAT_RESULTANT_PLASTICITY *MAT_RIGID *MAT_SID_DAMPER_DISCRETE_BEAM *MAT_SOIL_AND_FOAM *MAT_SOIL_AND_FOAM_FAILURE *MAT_SPRING_ELASTOPLASTIC

*MAT_ISOTROPIC_ELASTIC_PLASTIC *MAT_SPRING_GENERAL_NONLINEAR *MAT_JOHNSON_COOK

*MAT_SPRING_MAXWELL

*MAT_LAMINATED_GLASS

*MAT_STRAIN_RATE_DEPENDENT_PLASTICITY

*MAT_LINEAR_ELASTIC_DISCRETE_ BEAM

*MAT_VISCOELASTIC

*MAT_LOW_DENSITY_FOAM

*MAT_VISCOUS_FOAM

*MAT_MOONEY-RIVLIN_RUBBER *MAT_NONLINEAR_ELASTIC_DISCR ETE_BEAM

NODE

*NODE

PART_OPTION

*PART

*PART_REPOSITION

*PART_INERTIA

Note: The Property and Material ID in the analysis file are used as a numeric extension to the Property Set name and Material name in the Patran database.

Main Index

Chapter 5: Read Input File 155 Data Translated from the LS-DYNA Input File

Table 5-1

Input File Translation Data (continued)

Category RIGIDWALL

Keyword *RIGIDWALL_GEOMETRIC_

*RIGIDWALL_GEOMETRIC_PRISM_MOTION

*RIGIDWALL_GEOMETRIC_CYLINDE *RIGIDWALL_GEOMETRIC_SPHERE_MOTION R *RIGIDWALL_PLANAR_ *RIGIDWALL_GEOMETRIC_FLAT *RIGIDWALL_PLANAR_FINITE *RIGIDWALL_GEOMETRIC_PRISM *RIGIDWALL_PLANAR_ORTHO_FINITE *RIGIDWALL_GEOMETRIC_SPHERE *RIGIDWALL_PLANAR_MOVING *RIGIDWALL_GEOMETRIC_CYLINDE R_MOTION *RIGIDWALL_GEOMETRIC_FLAT_MO TION

SECTION

*SECTION_BEAM

*SECTION_SOLID

*SECTION_DISCRETE

*SECTION_TSHELL

*SECTION_SHELL

SET

*SET_NODE_COLUMN

*SET_SHELL_COLUMN

*SET_BEAM

*SET_SHELL_LIST

*SET_BEAM_GENERATE

*SET_SHELL_LIST_GENERATE

*SET_DISCRETE

*SET_SOLID

*SET_DISCRETE_GENERATE

*SET_SOLID_GENERATE

*SET_NODE_LIST

*SET_TSHELL

*SET_NODE_LIST_GENERATE

*SET_TSHELL_GENERATE

*SET_SEGMENT

TITLE

*TITLE

Note: The Property and Material ID in the analysis file are used as a numeric extension to the Property Set name and Material name in the Patran database.

Main Index

156 Patran Interface to LS-DYNA Preference Guide Reject and Error File

Reject and Error File The input file reader places all unsupported LsDyna keywords in a reject file which has the extension .rej. Also keywords that cannot be read due to incorrect data are placed in an error file with a line describing the error. The error file has the extension .err

Main Index

Chapter 6: Files Patran Interface to LS-DYNA Preference Guide

6

Files 

Main Index

Files

158

158 Patran Interface to LS-DYNA Preference Guide Files

Files The Patran LS-DYNA Preference uses or creates several files.The following table outlines each file, and its uses. In the file name definition, jobname will be replaced with the jobname assigned by the user.

File Name

Main Index

Description

*.db

This is the Patran database. During an analyze pass, model data is read from, and during a Read Results pass, model and/or results data is written into. This file typically resides in the current directory.

jobname.key

This is the LS-DYNA input file created by the interface. This file typically resides in the current directory

jobname.ptf

This is the LS-DYNA state file (family) which is read by the Read Results pass. This file typically resides in the current directory.

jobname.his

This is the LS-DYNA time history file. This file typically resides in the current directory.

jobname.flat

This file may be generated during a Read Results pass. If the results translation cannot write data directly into the specified Patran database it will create this jobname flat file. This file typically resides in the current directory.

LsDyna3dExecute

This is a UNIX script file which is called on to submit the analysis file to LS-DYNA after translation is complete. This file might need customizing with site specific data. The file contains many comments and should be easy to edit. Please see the LS-DYNA documentation for more details on how to edit this file. Patran searches its path to find this file, but it typically resides in the /bin/exe directory. Either use the general copy in /bin/exe, or place a local copy in a directory on the file path which takes precedence over the /bin/exe directory.

LsdynaPat3Submit

This is a UNIX script which is called on to submit the results translation program lsdynapat3. This file does not need site specific customization. However, this file can be modified to meet specific needs. Patran searches its file path to find this file, but it typically resides in the /bin/exe directory. Use the general copy in the /bin/exe/ directory, or use a local version by placing this local version in a directory higher on the Patran file path.

jp`Kc~íáÖìÉ=nìáÅâ=pí~êí=dìáÇÉ

Index Patran Interface to LS-DYNA Preference Guide

fåÇÉñ B Index

bulk data file, 148

newlink spot_weld, 78 nodes, 20

C

P

coordinate frames, 18

E elastoplastic, 33, 34, 36, 37, 39, 40, 41 element properties, 62 elements grounded scalar damper, 67 grounded scalar spring, 66, 73, 75, 76 scalar damping, 75, 76 scalar mass, 65 scalar spring, 73, 74 solid, 88 standard homogeneous plate, 84 standard membrane, 85

F files, 158 finite elements, 19, 21

I input file, 148

L load cases, 110 loads and boundary conditions, 91

M materials, 30 multi-point constraints, 22

N newlink butt_weld, 81 newlink fillet_weld, 79

Main Index

preferences, 12 properties, 62

R read input file, 148 results supported entities, 144

S supported entities, 13

T template database, 6

160 Patran Interface to LS-DYNA Preference Guide

Main Index