Patran 2008 R1 Interface To Patran 2 Neutral File Preference Guide

Patran 2008 r1 Interface To PATRAN 2 Neutral File Preference Guide

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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.

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Contents PATRAN 2 Neutral File Preference Guide

1

Overview Purpose

2

What is Included with this Product?

3

PATRAN 2 Neutral File Preference Integration with Patran 4

2

Building A Model Introduction to Building a Model Coordinate Frames Finite Elements 9 Nodes 9 Elements 10 Multi-Point Constraints Material Library Materials Form

6

8

11

25 26

Element Properties 46 Element Properties Form 47 Loads and Boundary Conditions Structural Displacement 54 Structural Force 57 Structural Pressure 60 Structural and Thermal Temperature Thermal Convection 71 Thermal Heat Flux 75 Thermal Heat Source 81 Thermal View Factor 85 Load Cases

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89

53

64

ii PATRAN 2 Neutral File Preference Guide ==

3

Running an Analysis Review of the Analysis Form Analysis Form 93

4

Results Templates Introduction

96

Generic Nodal Results File Generic Element Results File

5

97 99

Files Files

6

92

102

Unsupported Neutral File Packets Unsupported Neutral File Packets

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104

Chapter 1: Overview PATRAN 2 Neutral File Preference Guide

1

Main Index

Overview 

Purpose



What is Included with this Product?



PATRAN 2 Neutral File Preference Integration with Patran

2 3 4

2 PATRAN 2 Neutral File 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 postprocessor. A key feature of Patran’s predecessor, PATRAN 2, was the ability to interface third party software through the Neutral System. The PATRAN 2 Neutral File Preference provides a ready-to-use interface allowing third party codes that support the PATRAN 2.5 Neutral File to have immediate access to Patran as a pre- and post-processor. As much of the PATRAN 2 neutral file is supported as is possible. For more information, see Neutral File Format (p. 715) in the Patran Reference Manual. This Preference is fully integrated into Patran. The user can either create a new finite element model (e.g., import CAD geometry, define a mesh, assign element properties, materials and loads/boundary conditions) or import an existing Neutral File. All of Patran’s model editing capabilities are available. Results postprocessing is available. The results files should be stored in PATRAN 2 results file formats (e.g., .dis, .els formats). Two generic template files are provided for importing nodal and element results. For more information on results template files, see File Types and Formats (p. 46) in the Patran Reference Manual.

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Chapter 1: Overview 3 What is Included with this Product?

What is Included with this Product? The PATRAN 2 Neutral File Preference includes all of the following items: • A PCL function contained in patran2nf.plb which will add the PATRAN 2 Neutral File

Preference specific definitions to any Patran database (not already containing such definitions) at any time. • This user manual is included as part of the product. An on-line version is also provided to allow

the direct access to this information from within Patran.

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4 PATRAN 2 Neutral File Preference Guide PATRAN 2 Neutral File Preference Integration with Patran

PATRAN 2 Neutral File Preference Integration with Patran Creation of a PATRAN 2 Neutral File Preference 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 all of the MSC supplied interfaces. In order to create a template database which contains only PATRAN 2 Neutral File Preference specific definitions, the user should follow these steps: 1. Within Patran open a new database using base.db as the template. 2. Enter load_patran2nf() into the command line. 3. Save this database under a name such as patran2nf.db to be your new “PATRAN 2 Neutral File Preference only” template database. 4. From then on, when opening a new database, refer to patran2nf.db as your template database. PATRAN 2 Neutral File Preference specific definitions can be added to any database by simply typing load_patran2nf() into the Patran command line while the target database is the 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 the user create his 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 Modifying the Database Using PCL (Ch. 1) in the PCL and Customization or to the Patran Installation and Operations Guide.

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Chapter 2: Building A Model PATRAN 2 Neutral File Preference Guide

2

Main Index

Building A Model 

Introduction to Building a Model



Coordinate Frames



Finite Elements

9



Material Library

25



Element Properties



Patran



Load Cases

89

8

46

6

6 PATRAN 2 Neutral File 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 Preferences.

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Chapter 2: Building A Model 7 Introduction to Building a Model

To use the PATRAN 2 Neutral File Preference, set the analysis code selection to the appropriate selection. The analysis type may be set to either Structural or Thermal. Corresponding materials and LBCs will be presented for finite element modeling.

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8 PATRAN 2 Neutral File Preference Guide Coordinate Frames

Coordinate Frames Coordinate frame information is stored in Neutral File Packet 05 (see Packet Type 05: Coordinate Frames (p. 722) in the Patran Reference Manual). The coordinate frame ID is stored on the Header Card in entry ID. Coordinate frame types are stored on the Header Card in entry IV and are rectangular (IV = 1), cylindrical (IV = 2) and spherical (IV = 3). Three points (A, B, C), each located by three coordinates (1, 2, 3) in the global system, are required to define a coordinate frame. A 3x3 rotation matrix (R) is computed and stored in Packet 05. Four data cards, each containing 5 entries, are used to store the coordinate points and rotation matrix: Data Card 1 (A1, A2, A3, B1, B2), Data Card 2 (B3, C1, C2, C3, R11), Data Card 3 (R21, R31, R12, R22, R32), Data Card 4 (R13, R23, R33).

For more information on creating coordinate frames see Creating Coordinate Frames (p. 393) in the Geometry Modeling - Reference Manual Part 2.

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Chapter 2: Building A Model 9 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.

Nodes Nodes in Patran will generate Packet 01 entries in the neutral file (see Packet Type 01: Node Data (p. 718) in the Patran Reference Manual). Nodes can be created either directly using the Node object, or indirectly using the Mesh object. The Node ID is stored on the Header Card, entry ID. Each node location, defined relative to a coordinate frame, is defined by 3 values. These values are stored on Data Card 1, entries X, Y and Z. The coordinate frame is stored on Data Card 2, entry CID. If no reference frame is assigned, the global system (CID = 0) is used. Nodes that are exported to the neutral file are always resolved relative to the global system (CID = 0). The condensation flag, entry ICF on Data Card 2, indicates whether nodes are referenced by one or more elements (ICF = 1) or are unreferenced (ICF = 0). Data Card 2 contains entries which currently cannot be referenced within Patran and are set to default values. These include the Node Type (GTYPE = G), Number of Degrees of Freedom (NDF = 6), Node Configuration (CONFIG = 0) and the 6 permanent single point constraint flags (PSPC = 000000).

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10 PATRAN 2 Neutral File Preference Guide Finite Elements

Elements Finite Elements in Patran assigns element connectivity, such as Quad/4, for standard finite elements. The type of element to be created is not determined until the element properties are assigned. Elements can be created either discretely using the Element object, or indirectly using the Mesh object. Each element results in the creation of a Neutral File Packet 02 (see Packet Type 02: Element Data (p. 719) in the Patran Reference Manual). The Element ID is stored on the Header Card, entry ID. The shape (bar=2, tri = 3, quad = 4, tet = 5, wedge = 7, hex = 8) is stored on the Header Card, entry IV. The element’s nodes are listed on Data Card 2, entry LNODES.

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Chapter 2: Building A Model 11 Finite Elements

Multi-Point Constraints Multi-point constraints (MPCs) can be created from the Finite Elements menu. These are special element types which 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. Each defined MPC results in the creation of a Neutral File Packet 14 (see Packet Type 14: MPC Data (p. 725) in the Patran Reference Manual). The MPC ID is stored on the Header Card, entry MPC ID. The MPC Set ID--Header Card, entry MPC SID--always equals 1.

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12 PATRAN 2 Neutral File Preference Guide Finite Elements

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Chapter 2: Building A Model 13 Finite Elements

MPC Types To create an MPC, first select the type of MPC to be created from the option menu. The explicit and implicit MPC types defined for PATRAN 2.5 are available and described in the following table.

MPC Type

Main Index

Analysis Type

Description

Explicit

Structural

Creates an explicit MPC between a dependent degree-of-freedom and one or more independent degrees-of-freedom. The dependent term consists of a node ID and a degree-of-freedom, while an independent term consists of a coefficient, a node ID, and a degree-of-freedom. An unlimited number of independent terms can be specified, while only one dependent term can be specified. An optional constant term can be specified.

Rigid (Fixed)

Structural

Creates a rigid MPC between one independent node and one or more dependent nodes in which all six structural degrees-offreedom are rigidly attached to each other. An unlimited number of dependent terms can be specified, while only one independent term can be specified. Each term consists of a single node. There is no constant term for this MPC type.

Rigid (Pinned)

Structural

Creates a rigid MPC between one independent node and one or more dependent nodes in which all three translational degrees-offreedom are rigidly attached to each other. An unlimited number of dependent terms can be specified, while only one independent term can be specified. Each term consists of a single node. There is no constant term for this MPC type.

Linear Surface to Surface (LSS)

Structural

Creates an implicit MPC intended to connect topologically incompatible elements to model a continuum. Each dependent term consists of a node while two nodes describe the independent term. There is no constant term for this MPC type.

Linear Surface to Volume (LSV)

Structural

Creates an implicit MPC intended to connect a plate model to a solid model. The plate node displacements and rotations are defined in terms of the displacements of the solid element nodes. Each dependent terms contains one node while each independent terms consists of two nodes. There is no constant term for this MPC type.

Linear Volume to Volume (LVV)

Structural

Creates an implicit MPC intended to connect topologically incompatible solid elements to model a continuum. Each dependent term contains one node while each independent term consists of a minimum of three nodes and a maximum of four nodes. All three translational structural degrees-of-freedom are automatically specified. There is no constant term for this MPC type.

14 PATRAN 2 Neutral File Preference Guide Finite Elements

MPC Type

Main Index

Analysis Type

Description

Quadratic Surface to Surface (QSS)

Structural

Creates an implicit MPC intended to connect topologically incompatible elements to model a continuum. Each dependent terms consists of a node and each independent term consists of three nodes. There is no constant term for this MPC type.

Quadratic Surface to Volume (QSV)

Structural

Creates an implicit MPC intended to connect a shell model to a solid model. The plate node displacements and rotations are defined in terms of the displacements of the solid element nodes. Each dependent term contains one node and each independent term consists of three nodes. There is no constant term for this MPC type.

Quadratic Volume to Volume (QVV)

Structural

Creates an implicit MPC intended to connect topologically incompatible solid elements to model a continuum. Each dependent term containing one node while each independent term consisting of eight nodes. All three translational structural degrees-of-freedom are automatically specified. There is no constant term for this MPC type.

Slide

Structural

Creates an implicit MPC intended to define a vector between two nodes along which a dependent node must move. Each dependent term consists of a node while each independent term consisting of two nodes. There is no constant term for this MPC type.

Chapter 2: Building A Model 15 Finite Elements

Degrees-of-Freedom Whenever a list of degrees-of-freedom are expected for an MPC term, a listbox containing the valid degrees-of-freedom is displayed on the form. The following degrees-of-freedom are supported by the PATRAN 2 Neutral File Preference for MPCs:

Degree-of-freedom UX

Structural

UY

Structural

UZ

Structural

RX

Structural

RY

Structural

RZ

Structural

Important:

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Analysis Type

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.

16 PATRAN 2 Neutral File Preference Guide Finite Elements

Explicit MPCs

This subordinate MPC form appears when the Define Terms button is selected on the Finite Elements form, and Explicit is the selected type. The name EXPLICIT will appear in Packet 14, Data Card 1, entry TYPE.

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Chapter 2: Building A Model 17 Finite Elements

Rigid (Fixed, Pinned)

This subordinate MPC form appears when the Define Terms button is selected on the Finite Elements form, and Rigid (Fixed or Pinned) is the selected type. The name RIGID will appear in Packet 14, Data Card 1, entry TYPE.

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18 PATRAN 2 Neutral File Preference Guide Finite Elements

Linear Surface to Surface (LSS) MPCs

This subordinate MPC form appears when the Define Terms button is selected on the Finite Elements form, and Linear Surf-Surf is the selected type. The name LSS will appear in Packet 14, Data Card 1, entry TYPE.

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Chapter 2: Building A Model 19 Finite Elements

Linear Surface to Volume (LSV) MPCs

This subordinate MPC form appears when the Define Terms button is selected on the Finite Elements form, and Linear Surf-Vol is the selected type. The name LSV will appear in Packet 14, Data Card 1, entry TYPE.

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20 PATRAN 2 Neutral File Preference Guide Finite Elements

Linear Volume to Volume (LVV) MPCs

This subordinate MPC form appears when the Define Terms button is selected on the Finite Elements form, and Linear Vol-Vol is the selected type. The name LVV will appear in Packet 14, Data Card 1, entry TYPE.

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Chapter 2: Building A Model 21 Finite Elements

Quadratic Surface to Surface (QSS) MPCs

This subordinate MPC form appears when the Define Terms button is selected on the Finite Elements form, and Quadratic Surf-Surf is the selected type. The name QSS will appear in Packet 14, Data Card 1, entry TYPE.

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22 PATRAN 2 Neutral File Preference Guide Finite Elements

Quadratic Surface to Volume (QSV) MPCs

This subordinate MPC form appears when the Define Terms button is selected on the Finite Elements form, and Quadratic Surf-Vol is the selected type. The name QSV will appear in Packet 14, Data Card 1, entry TYPE.

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Chapter 2: Building A Model 23 Finite Elements

Quadratic Volume to Volume (QVV) MPCs

This subordinate MPC form appears when the Define Terms button is selected on the Finite Elements form, and Quadratic Vol-Vol is the selected type. The name QVV will appear in Packet 14, Data Card 1, entry TYPE.

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24 PATRAN 2 Neutral File Preference Guide Finite Elements

Slide MPCs

This subordinate MPC form appears when the Define Terms button is selected on the Finite Elements form, and Slider(12) is the selected type. The name SLIDE will appear in Packet 14, Data Card 1, entry TYPE.

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Chapter 2: Building A Model 25 Material Library

Material Library The Materials form will appear when the Material toggle is chosen. The selections made on the Materials menu will determine which material form appears, and ultimately, which material will be created. Two analysis types are available for the PATRAN 2 Neutral File Preference: Structural and Thermal. If the analysis type is structural, the following material types may be defined: Isotropic (type 1), 2D Anisotropic (type 2), 3D Anisotropic (type 6), 2D orthotropic (type 3), 3D Orthotropic (type 3), and Composite (types 11 to 13). If the analysis type is thermal, the following material types may be defined: Isotropic (type 4) and Anisotropic (type 5). Structural materials include thermal material properties (e.g, conductivity and specific heat) while thermal materials only include the thermal material properties. Each material definition will be stored in a unique Neutral File Packet 03 (see Packet Type 03: Material Properties (p. 720) in the Patran Reference Manual. The following pages discuss the Materials forms, and details of all the material property definitions supported by the PATRAN 2 Neutral File Preference.

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26 PATRAN 2 Neutral File Preference Guide Material Library

Materials Form This form appears when Materials is selected on the main menu when the analysis type is Structural. The analysis type may also be Thermal.

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Chapter 2: Building A Model 27 Material Library

Structural Isotropic Linear Elastic

This subordinate form appears when the Input Properties button is selected on the Materials form when Structural Isotropic is selected on the Material form, and when Linear Elastic is the selected Constitutive Model on the Input Options form. Use this form to define the linear elasticity values and other miscellaneous values for an Isotropic material (material type = 1). All entered values appear in Packet 03, Data Card 2.

Thermal Properties

This subordinate form appears when the Input Properties button is selected on the Materials form when Isotropic is selected on the Material form, and when Thermal Properties is the selected Constitutive Model on the Input Options form. Use this form to define the linear thermal values for an Isotropic material (material type = 1). All entered values appear in Packet 03, Data Card 2.

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28 PATRAN 2 Neutral File Preference Guide Material Library

2D Orthotropic Linear Elastic

This subordinate form appears when the Input Properties button is selected on the Materials form when 2D Orthotropic is the selected Object, and Linear Elastic is the selected Constitutive Model on the Input Options form. Use this form to define the elasticity properties, and other miscellaneous data for a 2 dimensional Orthotropic material (material type = 3). All entered values appear in Packet 03, Data Card 2.

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Chapter 2: Building A Model 29 Material Library

The remaining Linear Elastic properties for 2D Orthotropic materials and their location in the PATRAN 2 Neutral File are shown.

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30 PATRAN 2 Neutral File Preference Guide Material Library

Thermal Properties

This subordinate form appears when the Input Properties button is selected on the Materials form when 2D Orthotropic is selected on the Material form, and when Thermal Properties is the selected Constitutive Model on the Input Options form. Use this form to define the linear thermal values for an 2D Orthotropic material (material type = 3). All entered values appear in Packet 03, Data Card 2.

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Chapter 2: Building A Model 31 Material Library

3D Orthotropic Linear Elastic

This subordinate form appears when the Input Properties button is selected on the Materials form when 3D Orthotropic is the selected Object, and Linear Elastic is the selected Constitutive Model on the Input Options form. Use this form to define the elasticity properties and other miscellaneous data for a 3D Orthotropic material. (material type = 3). All entered values appear in Packet 03, Data Card 2.

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32 PATRAN 2 Neutral File Preference Guide Material Library

The remaining Linear Elastic properties for 3D Orthotropic materials and their location in the PATRAN 2 Neutral File are shown.

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Chapter 2: Building A Model 33 Material Library

Thermal Properties

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 Thermal Properties is the selected Constitutive Model on the Input Options form. Use this form to define the linear thermal values for an 3D Orthotropic material (material type = 3). All entered values appear in Packet 03, Data Card 2.

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34 PATRAN 2 Neutral File Preference Guide Material Library

2D Anisotropic Linear Elastic

This subordinate form appears when the Input Properties button is selected on the Materials form when 2D Anisotropic is the selected Object, and Linear Elastic is the selected Constitutive Model on the Input Options form. Use this form to define the elasticity properties and other miscellaneous data for a 2D Anisotropic material (material type = 2). All entered values appear in Packet 03, Data Card 2.

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Chapter 2: Building A Model 35 Material Library

The remaining Linear Elastic properties for 2D Anisotropic materials and their location in the PATRAN 2 Neutral File are shown.

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36 PATRAN 2 Neutral File Preference Guide Material Library

Thermal Properties

This subordinate form appears when the Input Properties button is selected on the Materials form when 2D Anisotropic is selected on the Material form, and when Thermal Properties is the selected Constitutive Model on the Input Options form. Use this form to define the linear thermal values for an 2D Anisotropic material (material type = 2). All entered values appear in Packet 03, Data Card 2.

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Chapter 2: Building A Model 37 Material Library

3D Anisotropic Linear Elastic

This subordinate form appears when the Input Properties button is selected on the Materials form when 3D Anisotropic is the selected Object, and Linear Elastic is the selected Constitutive Model on the Input Options form. Use this form to define the elasticity properties and other miscellaneous data for a 3D Anisotropic material (material type = 6). All entered values appear in Packet 03, Data Card 2.

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38 PATRAN 2 Neutral File Preference Guide Material Library

More of the Linear Elastic properties for 3D Anisotropic materials and their location in the PATRAN 2 Neutral File are shown.

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Chapter 2: Building A Model 39 Material Library

The remaining Linear Elastic properties for 3D Anisotropic materials and their location in the PATRAN 2 Neutral File are shown.

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40 PATRAN 2 Neutral File Preference Guide Material Library

Thermal Properties

This subordinate form appears when the Input Properties button is selected on the Materials form when 3D Anisotropic is selected on the Material form, and when Thermal Properties is the selected Constitutive Model on the Input Options form. Use this form to define the linear thermal values for an 3D Anisotropic material (material type = 6). All entered values appear in Packet 03, Data Card 2.

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Chapter 2: Building A Model 41 Material Library

Composite The Composite forms provide alternate ways of defining the linear elastic properties of materials. All composite options, except for Laminated Composite, will always result in a homogeneous elastic material. Three composite material types are currently supported in the neutral file: Halpin-Tsai (HAL, type = 11), Laminate (LAM, type = 12) and Rule of Mixtures (MIX, type = 13). The HAL and MIX options are stored in Neutral File Packet 03 as are the other homogeneous materials. The LAM option is also stored in Packet 03; however, an additional data card, Data Card 3, is used to store the associated ply data (thicknesses, orientation angles and material IDs). The number of associated ply data values (the number of defined plies) is stored on the Header Card, entry N1. Patran will compute and store, for a composite material, in Packet 03 the equivalent engineering properties (Data Card 2, Material Constants 27 to 35), 21 material stiffness matrix terms (Data Card 2, Material Constants 37 to 57), 6 2D membrane stiffness (A) matrix terms (Data Card 2, Material Constants 58 to 63), 6 2D bending stiffness (D) matrix terms (Data Card 2, Material Constants 64 to 69) and 9 2D membrane/bending (B) coupling terms (Data Card 2, Material Constants 70 to 78). Neutral file import of a Halpin-Tsai (HAL) material will be converted to a 3D Orthotropic material in Patran. Similarly, import of a neutral file containing a Rule of Mixtures (MIX) material will be converted

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42 PATRAN 2 Neutral File Preference Guide Material Library

to a 3D Anisotropic material in Patran. The reason for the conversion is that, although Patran supports creation of these material types, the PATRAN 2 Neutral File does not provide for a complete definition. This is also the reason that a neutral file export of these material types results in the creation of a homogeneous elastic material. The PATRAN 2 Neutral File only supports full definition of a Laminated (LAM) composite material. For detailed discussions on how to build composite materials, please refer to Composite Materials Construction (p. 116) in the Patran Reference Manual.

Laminated This subordinate form appears when the Input Properties button is selected on the Materials form when Composite is the selected Object, and Laminate is the selected Method. Use this form to define the laminate lay-up data for a composite laminate material (LAM, material type = 12). Each defined composite laminate material will be stored in a unique Neutral File Packet 03. The total thickness, number of plies and offset are defined on Data Card 2, Material Constants 3, 4 and 5, respectively. The total number of associated ply data values is stored on the Header Card, entry N1.

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Chapter 2: Building A Model 43 Material Library

Thermal Isotropic Linear Elastic

This subordinate form appears when the Input Properties button is selected on the Materials form when Thermal Isotropic (TIS) is selected on the Material form, and when Linear Elastic is the selected Constitutive Model on the Input Options form. Use this form to define the linear elastic thermal material values for an Thermal Isotropic material (material type = 4). All entered values appear in Packet 03, Data Card 2.

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44 PATRAN 2 Neutral File Preference Guide Material Library

Thermal Anisotropic Linear Elastic

This subordinate form appears when the Input Properties button is selected on the Materials form when Thermal is the analysis type, Anisotropic is the selected Object, and Linear Elastic is the selected Constitutive Model on the Input Options form. Use this form to define the elasticity properties Thermal Anisotropic (TAN) material (material type = 5). All entered values appear in Packet 03, Data Card 2.

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Chapter 2: Building A Model 45 Material Library

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46 PATRAN 2 Neutral File Preference Guide Element Properties

Element Properties The Element Properties form appears when the Element Properties toggle 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 element will be created. Element properties are simply categorized as Generic 0D, Generic 1D, Generic 2D and Generic 3D. An element configuration ID, required for each property set definition, is used to distinguish element types (e.g., Generic 3D, Configuration 8 might represent an 8-node hexahedral while Generic 3D, Configuration 10 might represent a 10-node tetrahedral). Each category of element dimension has a number of pre-defined property definitions. For example, Generic 1D properties include Configuration ID, Orientation, Offset at Nodes 1 and 2, and Pinned degrees-of-freedom at nodes 1 and 2. The remaining properties are generically defined as Prop 1, Prop 2, etc. Each of the generic properties can contain real scalar, string, integer or material property name data. Element property data is stored in Neutral File Packet 04 (see Packet Type 04: Element Properties (p. 721) in the Patran Reference Manual). Finite element definitions, stored in Packet 02, reference the associated Packet 04 element properties by the property ID. Two analysis types are available under the PATRAN 2 Neutral File Preference: Structural and Thermal. Element property sets can reference materials. For those element property sets created under the Structural type, the following materials are available: Isotropic, 2D Orthotropic, 3D orthotropic, 2D Anisotropic, 3D Anisotropic and Composite. Element property sets created under the Thermal type can only reference Thermal Isotropic (TIS) and Thermal Anisotropic (TAN) materials. For more details about these materials, please refer to the Material Librarysection of this document. The following pages give an introduction to the Element Properties form, and details of all the element property definitions supported by the PATRAN 2 Neutral File Preference.

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Chapter 2: Building A Model 47 Element Properties

Element Properties Form This form appears when Element Properties is selected on the main menu. There are four option menus on this form, each will determine which element type will be created, and which property forms will appear.

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48 PATRAN 2 Neutral File Preference Guide Element Properties

Generic 0D This subordinate form appears when the Input Properties button is selected on the Element Properties form. The data entered is stored in Neutral File Packet Types 02 (Element Data) and 04 (Property Data). The shape code will be 2 (Packet 02, Header Card, entry IV and Packet 04, Header Card, entry N1). In addition to the Configuration Id entry, the remaining entries are generically described as “Prop N” where N = 1, 2, ...39. The data entered in these boxes is stored in Packet 04 Data Cards. Each Data Card contains five data entries. Thus, Prop 1 through Prop 5 are on the first Data Card, Prop 6 through Prop 10 on the second Data Card, etc. All of these entries are optional. Only the first data entry up to the largest data box number with entered data are stored in Packet 04. The number of data fields stored is indicated in Packet 04, Header Card, entry N4.

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Chapter 2: Building A Model 49 Element Properties

Generic 1D This subordinate form appears when the Input Properties button is selected on the Element Properties form. The data entered is stored in Neutral File Packet Types 02 (Element Data) and 04 (Property Data). The shape code will be 2 (Packet 02, Header Card, entry IV and Packet 04, Header Card, entry N1).

The remaining entries are generically described as “Prop N” where N = 1, 2, ...34. The data entered in these boxes is stored in Packet 04 Data Cards. Each Data Card contains five data entries. Thus, Prop 1 through Prop 5 are on the first Data Card, Prop 6 through Prop 10 on the second Data Card, etc. All of these entries are optional. Only the first data entry up to the largest data box number with entered data are stored in Packet 04. The number of data fields stored is indicated in Packet 04, Header Card, entry N4.

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50 PATRAN 2 Neutral File Preference Guide Element Properties

Generic 2D This subordinate form appears when the Input Properties button is selected on the Element Properties form. The data entered is stored in Neutral File Packet Types 02 (Element Data) and 04 (Property Data). The shape code will be 3 or 4 for a triangle or quadrilateral, respectively (Packet 02, Header Card, entry IV and Packet 04, Header Card, entry N1). In addition to the Configuration Id and Material Orientation entries, the remaining entries are generically described as “Prop N” where N = 1, 2, ...38. The data entered in these boxes is stored in Packet 04 data cards. Each data card contains 5 data entries. Thus, Prop 1 through Prop 5 are on the first data card, Prop 6 through Prop 10 on the second data card, etc. All of these entries are optional. Only the first data entry up to the largest data box number with entered data are stored in Packet 04. The number of data fields stored is indicated in Packet 04, Header Card, entry N4.

Main Index

Chapter 2: Building A Model 51 Element Properties

Generic 3D This subordinate form appears when the Input Properties button is selected on the Element Properties form. The data entered is stored in Neutral File Packet Types 02 (Element Data) and 04 (Property Data). The shape code will be 5, 7, or 8 for a tetrahedral, wedge or hexahedral, respectively (Packet 02, Header Card, entry IV and Packet 04, Header Card, entry N1). In addition to the Configuration Id entry, the remaining entries are generically described as “Prop N” where N = 1, 2, ...39. The data entered in these boxes is stored in Packet 04 Data Cards. Each Data Card contains five data entries. Thus, Prop 1 through Prop 5 are on the first Data Card, Prop 6 through Prop 10 on the second Data Card, etc. All of these entries are optional. Only the first data entry up to the largest data box number with entered data are stored in Packet 04. The number of data fields stored is indicated in Packet 04, Header Card, entry N4.

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52 PATRAN 2 Neutral File Preference Guide Element Properties

Main Index

Chapter 2: Building A Model 53 Loads and Boundary Conditions

Loads and Boundary Conditions The Loads and Boundary Conditions (LBCs) form will appear when the Loads/BCs toggle, located on the Patran application selections, is chosen. When creating a loads and boundary condition 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 loads and boundary conditions will be created. Each defined LBC will result in the creation of one or more associated neutral file packets. Currently available Structural LBCs include Displacement (Packet 08), Force (Packet 07), Pressure (Packets 06 and 07) and Temperature (Packets 10 and 11). The following Thermal LBCs are available: Heat Flux (Packets 15 and 16), Heat Source (Packet 16), Convection (Packet 17), Temperature (Packets 10 and 11) and View Factor Data (Packet 19). 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 2 Neutral File Preference.

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54 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

Structural Displacement This form defines the Displacement LBCs. The associated data will be stored in Neutral File Packet 08. The constraint set ID (Packet 08, Header Card, entry IV) is controlled by the associated Load Case (see the Load Cases documentation for more details).

This subordinate form appears when the Input Data button is selected on the LBCs form when the Current Load Case Type is Static and the LBC Type is Displacement.

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Chapter 2: Building A Model 55 Loads and Boundary Conditions

This subordinate form appears when the Select Application Region button is selected on the Loads and Boundary Conditions form when the Current Load Case Type is Static and the Loads and Boundary Condition Type is Displacement. The nodes can either be explicitly selected (Geometry Filter = FEM) or indirectly through their association with one or more geometrical entities (Geometry Filter = Geometry). In either case, each selected node will generate a Packet 08. The node ID is stored in the Header Card, entry ID.

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56 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

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Chapter 2: Building A Model 57 Loads and Boundary Conditions

Structural Force This form defines the Force LBCs. The associated data will be stored in Neutral File Packet 07. The Load Set ID (Packet 07, Header Card, entry IV), is controlled by the associated Load Case (see the Load Cases documentation for more details).

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 and the LBC Type is Force.

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58 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

This subordinate form appears when the Select Application Region button is selected on the Loads and Boundary Conditions form when the Current Load Case Type is Static and the LBC Type is Force. The nodes can either be explicitly selected (Geometry Filter = FEM) or indirectly through their association with one or more geometrical entities (Geometry Filter = Geometry). In either case, each selected node will generate a Packet 07. The node ID is stored in the Header Card, entry ID.

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Chapter 2: Building A Model 59 Loads and Boundary Conditions

s

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60 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

Structural Pressure This form defines the Pressure Loads and Boundary Conditions. The associated data will be stored in Neutral File Packet 06. The Load Set ID (Packet 06, Header Card, entry IV), is controlled by the associated Load Case (see the Load Cases documentation for more details).

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 Target Element Type is 3D and the Loads and Boundary Condition Type is Pressure. This form is applicable for both element uniform and variable pressures. If the load type is Uniform, then only one pressure value is stored; otherwise, three or four pressure values, for triangles or quadrilaterals, are stored for Variable load types.

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Chapter 2: Building A Model 61 Loads and Boundary Conditions

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 Target Element Type is 2D and the Loads and Boundary Condition Type is Pressure. This form is applicable for both element uniform and variable pressures. If the load type is Uniform, then only one pressure value is stored; otherwise, three or four pressure values, for triangles or quadrilaterals, are stored for Variable load types.

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62 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

This subordinate form appears when the Select Application Region button is selected on the Loads and Boundary Conditions form when the Current Load Case Type is Static, LBC Type is Pressure and the Target Element Type is 3D. This form is applicable for both element uniform and variable load types. The elements’ faces can either be explicitly selected (Geometry Filter = FEM) or indirectly through their association with one or more geometrical entities (Geometry Filter = Geometry). In either case, each selected element will generate a Packet 06. The element ID is stored in the Header Card, entry ID.

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Chapter 2: Building A Model 63 Loads and Boundary Conditions

This subordinate form appears when the Select Application Region button is selected on the Loads and Boundary Conditions form when the Current Load Case Type is Static, LBC Type is Pressure and the Target Element Type is 2D. This form is applicable for both element uniform and variable load types. The elements and element’s edges can either be explicitly selected (Geometry Filter = FEM) or indirectly through their association with one or more geometrical entities (Geometry Filter = Geometry). In either case, each selected element will generate a Packet 06. The element ID is stored in the Header Card, entry ID.

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64 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

Structural and Thermal Temperature This form defines the Structural and Thermal Temperature LBCs. The associated data will be stored in Neutral File Packets 10 (nodal) and 11 (element uniform). The Load Set ID (Header Card, entry IV), is controlled by the associated Load Case (see the Load Cases documentation for more details). The locations of data within either Packet 10 or 11, as input on these forms, are discussed below.

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Chapter 2: Building A Model 65 Loads and Boundary Conditions

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 and the Loads and Boundary Condition Type is Temperature. This input data form is applicable for nodal, element uniform and variable temperatures loads. Nodal temperature data will be stored in Packet 10 and element temperature data in Packet 11.

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66 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

This subordinate form appears when the Select Application Region button is selected on the Loads and Boundary Conditions form when the Current Load Case Type is Static, LBC Type is Nodal Temperature. The nodes can either be explicitly selected (Geometry Filter = FEM) or indirectly through their association with one or more geometrical entities (Geometry Filter = Geometry). In either case, each selected node will generate a Packet 10. The node ID is stored in the Header Card, entry ID.

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Chapter 2: Building A Model 67 Loads and Boundary Conditions

This subordinate form appears when the Select Application Region button is selected on the LBCs form when the Current Load Case Type is Static, LBC Type is Temperature and the Target Element Type is 3D. This form is applicable for both uniform and variable element temperature loads. The elements can either be explicitly selected (Geometry Filter = FEM) or indirectly through their association with one or more geometrical entities (Geometry Filter = Geometry). Each selected element will generate a Packet 11 for uniform loads and one or more Packet 10’s, one for each element node, for variable loads. The element ID is stored in the Header Card, entry ID.

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68 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

This subordinate form appears when the Select Application Region button is selected on the LBCs form when the Current Load Case Type is Static, LBC Type is Temperature and the Target Element Type is 2D. This form is applicable for both uniform and variable element temperature loads. The elements can either be explicitly selected (Geometry Filter = FEM) or indirectly through their association with one or more geometrical entities (Geometry Filter = Geometry). Each selected element will generate a Packet 11 for uniform loads and one or more Packet 10’s, one for each element node, for variable loads. The element ID is stored in the Header Card, entry ID.

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Chapter 2: Building A Model 69 Loads and Boundary Conditions

This subordinate form appears when the Select Application Region button is selected on the LBCs form when the Current Load Case Type is Static, LBC Type is Temperature and the Target Element Type is 1D. This form is applicable for both uniform and variable element temperature loads. The elements can either be explicitly selected (Geometry Filter = FEM) or indirectly through their association with one or more geometrical entities (Geometry Filter = Geometry). Each selected element will generate a Packet 11 for uniform loads and one or more Packet 10’s, one for each element node, for variable loads. The element ID is stored in the Header Card, entry ID.

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70 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

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Chapter 2: Building A Model 71 Loads and Boundary Conditions

Thermal Convection This form defines the Thermal Convection LBCs. The associated data will be stored in Neutral File Packet 17. The Convection Coefficient Set ID (Header Card, entry IV), is controlled by the associated Load Case (see the Load Case documentation for more details).

This subordinate form appears when the Input Data button is selected on the LBCs form when the Current Load Case Type is Static, the Target Element Type is 3D and the LBC Type is Thermal Convection.This form is applicable for both element uniform and variable convection coefficients. If the load type is Uniform, then only one convection coefficient is stored; otherwise, from one to four convection coefficients are stored for Variable load types. Uniform load types are indicated by setting the node flag

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72 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

NFLAG = 0 (Data Card 1). Variable load types are indicated by setting the node flag NFLAG = 1 (Data Card 1) and identifying the location and number of element nodes with the eight integer node flags NODE (Data Card 1); each node flag is 0 if no coefficient is defined and 1 for a defined coefficient.

This subordinate form appears when the Input Data button is selected on the LBCs form when the Current Load Case Type is Static, the Target Element Type is 2D and the LBC Type is Thermal Convection. This form is applicable for both element uniform and variable pressures. If the load type is Uniform, then only one pressure value is stored; otherwise, from one to four heat flux values are stored for Variable load types.

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Chapter 2: Building A Model 73 Loads and Boundary Conditions

This subordinate form appears when the Select Application Region button is selected on the LBCs form when the Current Load Case Type is Static, LBC Type is Pressure and the Target Element Type is 3D. This form is applicable for both element uniform and variable load types. The element’s faces can either be explicitly selected (Geometry Filter = FEM) or indirectly through their association with one or more geometrical entities (Geometry Filter = Geometry). In either case, each selected element will generate a Packet 17. The element ID is stored in the Header Card, entry ID.

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74 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

This subordinate form appears when the Select Application Region button is selected on the LBCs form when the Current Load Case Type is Static, LBC Type is Thermal Convection and the Target Element Type is 2D. This form is applicable for both element uniform and variable load types. The elements can either be explicitly selected (Geometry Filter = FEM) or indirectly through their association with one or more geometrical entities (Geometry Filter = Geometry). In either case, each selected element will generate a Packet 17. The element ID is stored in the Header Card, entry ID.

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Chapter 2: Building A Model 75 Loads and Boundary Conditions

Thermal Heat Flux This form defines the Thermal Heat Flux LBCs. The associated data will be stored in Neutral File Packet 16. The Heat Flux Set ID (Header Card, entry IV), is controlled by the associated Load Case (see the Load Case documentation for more details). The locations of data within Packet 16, as input on these forms, are discussed below.

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76 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

This subordinate form appears when the Input Data button is selected on the LBCs form when the Current Load Case Type is Static, the Target Element Type is 3D and the LBC Type is Thermal Heat Flux. This form is applicable for both element uniform and variable heat flux. If the load type is Uniform, then only one heat flux value is stored; otherwise, from one to four values are stored for Variable load types. Uniform load types are indicated by setting the node flag NFLAG = 0 (Data Card 1). Variable load types are indicated by setting the node flag NFLAG = 1 (Data Card 1) and identifying the location and number of element nodes with the eight integer node flags NODE (Data Card 1); each node flag is 0 if no heat flux is defined and 1 for a defined flux. As heat flux is currently only supported as a per unit area value, the dimension code N3 = 2 on Packet 16’s Header Card.

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Chapter 2: Building A Model 77 Loads and Boundary Conditions

This subordinate form appears when the Input Data button is selected on the LBCs form when the Current Load Case Type is Static, the Target Element Type is 2D and the LBC Type is Thermal Heat Flux.This form is applicable for both element uniform and variable pressures. If the load type is Uniform, then only one pressure value is stored; otherwise, from one to four heat flux values are stored for Variable load types.

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78 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

This subordinate form appears when the Select Application Region button is selected on the LBCs form when the Current Load Case Type is Static, LBC Type is Thermal Heat Flux and the Target Element Type is 3D. This form is applicable for both element uniform and variable load types. The element’s free faces can either be explicitly selected (Geometry Filter = FEM) or indirectly through their association with one or more geometrical entities (Geometry Filter = Geometry). In either case, each selected element will generate a Packet 16. The element ID is stored in the Header Card, entry ID.

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Chapter 2: Building A Model 79 Loads and Boundary Conditions

This subordinate form appears when the Select Application Region button is selected on the LBCs form when the Current Load Case Type is Static, LBC Type is Thermal Heat Flux and the Target Element Type is 2D. This form is applicable for both element uniform and variable load types. The elements and element’s edges can either be explicitly selected (Geometry Filter = FEM) or indirectly through their association with one or more geometrical entities (Geometry Filter = Geometry). In either case, each selected element will generate a Packet 16. The element ID is stored in the Header Card, entry ID.

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80 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

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Chapter 2: Building A Model 81 Loads and Boundary Conditions

Thermal Heat Source This form defines the Thermal Heat Source LBCs. The associated data will be stored in Neutral File Packet 15 (Nodal) or 16 (Element Uniform). The Heat Source Set ID (Header Card, entry IV), is controlled by the associated Load Case (see the Load Case documentation for more details).

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82 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

This subordinate form appears when the Input Data button is selected on the LBCs form when the Current Load Case Type is Static and the LBC Type is Thermal Heat Source. This form is applicable for both nodal and element uniform heat sources. If the load type is Nodal, then the heat source data is stored in Packet 15 with the node stored on the Header Card, entry ID and the heat source value in entry HEAT on Data Card 1. Uniform heat source loads are stored in Packet 16 and are indicated by setting the node flag NFLAG = 0 (Data Card 1). The Element ID is stored on the Header Card in the entry ID and the heat source value on Data Card 2, entry HEAT. If a uniform element heat source is defined, the dimension code N3 = 3 on Packet 16’s Header Card, indicating a per unit volume value.

This subordinate form appears when the Select Application Region button is selected on the LBCs form when the Current Load Case Type is Static and the LBC Type is Thermal Heat Source. The nodes can either be explicitly selected (Geometry Filter = FEM) or indirectly through their association with one or more geometrical entities (Geometry Filter = Geometry). In either case, each selected node will generate a Packet 15. The node ID is stored in the Header Card, entry ID.

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Chapter 2: Building A Model 83 Loads and Boundary Conditions

This subordinate form appears when the Select Application Region button is selected on the LBCs form when the Current Load Case Type is Static, LBC Type is Element Uniform Thermal Heat Source. The elements can either be explicitly selected (Geometry Filter = FEM) or indirectly through their association with one or more geometrical entities (Geometry Filter = Geometry). In either case, each selected element will generate a Packet 16. The element ID is stored in the Header Card, entry ID.

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84 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

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Chapter 2: Building A Model 85 Loads and Boundary Conditions

Thermal View Factor This form defines the Thermal View Factor Loads and Boundary Conditions. The associated data will be stored in Neutral File Packet 19.

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86 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

This subordinate form appears when the Input Data button is selected on the LBCs form when the Current Load Case Type is Static and the LBC Type is Thermal View Factor. This form is valid for 1D, 2D and 3D elements.

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Chapter 2: Building A Model 87 Loads and Boundary Conditions

The remaining input on the previous form is as follows.

This subordinate form appears when the Select Application Region button is selected on the LBCs for3m when the Current Load Case Type is Static, LBC Type is Thermal View Factor. The elements can either be explicitly selected (Geometry Filter = FEM) or indirectly through their association with one or more geometrical entities (Geometry Filter = Geometry). In either case, each selected element will generate a Packet 19. The element ID is stored in the Header Card, entry ID.

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88 PATRAN 2 Neutral File Preference Guide Loads and Boundary Conditions

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Chapter 2: Building A Model 89 Load Cases

Load Cases Load Cases in Patran are used to group a series of Loads and Boundary Conditions (LBCs) into one load environment for the model.

Load Cases

Load case names can be used to control the Loads and Boundary Conditions Set IDs in the neutral file. If a load case name is of the format “load_case_name.xxx” where xxx is a valid integer, all associated LBCs will retain this number as a Set ID upon export to the neutral file. If no Load Case names use the valid integer extension, then the non-empty Load Cases (ones with assigned LBCs) will be sequentially numbered beginning from 1. If one or more Load Cases exist with a valid integer extension, the largest integer extension is used as the base and all subsequent non-empty Load Cases without a valid integer extension are numbered as sequential increments off this value. For more detailed discussions of this form, refer to Create Load Cases (p. 166) in the Patran Reference Manual.

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90 PATRAN 2 Neutral File Preference Guide Load Cases

Main Index

Chapter 3: Running an Analysis PATRAN 2 Neutral File Preference Guide

3

Running an Analysis 

Main Index

Review of the Analysis Form

92

92 PATRAN 2 Neutral File 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. Currently, the available options on the Analysis form are to export and import a PATRAN 2 Neutral File. The following pages describe these forms.

Main Index

Chapter 3: Running an Analysis 93 Review of the Analysis Form

Analysis Form This form appears when the Analysis toggle is chosen on the main menu. The Apply button simply accesses the File Export or Import form under the File option on the Patran control panel.

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94 PATRAN 2 Neutral File Preference Guide Review of the Analysis Form

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Chapter 4: Results Templates PATRAN 2 Neutral File Preference Guide

4

Main Index

Results Templates 

Introduction



Generic Nodal Results File



Generic Element Results File

96 97 99

96 PATRAN 2 Neutral File Preference Guide Introduction

Introduction The PATRAN 2 Neutral File Preference provides two generic PATRAN 2 type results file templates. PATRAN 2 provided for the import of results, defined in a text file and defined by a template file. Patran also supports this means of results import. Two generic results templates are delivered with this Preference. The intention is to provide a mechanism to import both nodal and element based results. These templates can be copied and edited to match specific results file formats. For more information on results file templates, please refer to Patran 2.5 Results Files (p. 46) in the Patran Reference Manual.

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Chapter 4: Results Templates 97 Generic Nodal Results File

Generic Nodal Results File The PATRAN 2 Neutral File Preference includes a generic nodal results template, p2nf_nod.res_tmpl. Typically, this template is located in the directory $P3_home/res_templates. The following documents the results file contents expected by the generic nodal results template.

Record

Description

Record 1

TITLE, NNODES, MAXNOD, VALMAX, NDMAX, NWIDTH

Record 2

SUBTITLE 1

Record 3

SUBTITLE 2

Record 4 to NNODES+3

NODID, VAL(1), VAL(2), VAL(3), VAL(4), VAL(5), VAL(6)

Record

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Description (Format)

Record 1

TITLE (80A1)

Record 2

NNODES, MAXNOD, VALMAX, NDMAX, NWIDTH (2I9, E15.6, 2I9)

Record 3

SUBTITLE 1 (80A1)

Record 4

SUBTITLE 2 (80A1)

Record 5 to NNODES+4

NODID, (VAL(J), J =1 TO NWIDTH) (I8, (5E13.7))

98 PATRAN 2 Neutral File Preference Guide Generic Nodal Results File

where the parameters are:

Parameter

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Description

TITLE

Title (up to 80 characters)

SUBTITLE 1

Same format as TITLE.

SUBTITLE 2

Same format as TITLE.

NNODES

Number of nodes (integer)

MAXNOD

Highest node ID number (integer)

VALMAX

Maximum absolute nodal result value (real)

NDMAX

Node ID where VALMAX occurs (integer)

NWIDTH

Number of columns of data (integer)

NODID

Node ID (integer)

VAL(J)

Result value #J (J =1 TO 6) for Node # NODID (real)

Chapter 4: Results Templates 99 Generic Element Results File

Generic Element Results File The PATRAN 2 Neutral File Preference includes a generic element results template, p2nf_els.res_tmpl. This template is modeled after the PATRAN 2 element stress results file template. Typically this template is located in the directory $P3_home/res_templates. The following documents the results file contents expected by the generic element results template.

Record

Description

Record 1

TITLE, NWIDTH

Record 2

SUBTITLE 1

Record 3

SUBTITLE 2

Record 4 to N+3

ID, NSHAPE, (VAL(J), J=1 TO NWIDTH)

Record N+4

ID = 0 or end-of-file

Record

Description (Format)

Record 1

TITLE (80A1)

Record 2

NWIDTH (I5)

Record 3

SUBTITLE 1 (80A1)

Record 4

SUBTITLE 2 (80A1)

Record 5 to NNODES+4

ID, SHAPE, (VAL(J), J =1 TO NWIDTH) (2I8, /, (6E13.7))

where the parameters are:

Parameter

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Description

TITLE

Title (up to 80 characters)

SUBTITLE 1

Same format as TITLE.

SUBTITLE 2

Same format as TITLE.

NWIDTH

Number of columns of data (integer)

ID

Element ID (integer)

100 PATRAN 2 Neutral File Preference Guide Generic Element Results File

Parameter

Description

NSHAPE

Essential shape code (BAR = 2, TRI = 3, QUAD = 4, TET = 5, PYR = 6, WEDGE = 7, HEX = 8; integer)

VAL(J)

Result value(s) (real)

The generic element results template is defined such that NWIDTH = 20 where the columns 1 - 6 are labeled as “Generic Tensor 1,” columns 7 - 12 as “Generic Tensor 2” and columns 13 - 20 as “Scalar 1,” “Scalar 2,”...”Scalar 8,” respectively. The intent of providing this format for the generic elements results template is not to force a particular results file format but rather provide an illustration as to how an element results file template can be defined to describe a results file format containing both tensor and scalar results.

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Chapter 5: Files PATRAN 2 Neutral File Preference Guide

5

Files 

Main Index

Files

102

102 PATRAN 2 Neutral File Preference Guide Files

Files These files are associated with the PATRAN 2 Neutral File Preference.

File Name

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Description

*.db

This is the Patran database. This file typically resides in the current directory.

*.out

This is the PATRAN 2.5 neutral file. These files typically reside in the current directory.

p2nf_nod.res_tmpl

The generic nodal results template. This file typically resides in the /res_templates directory.

p2nf_els.res_tmpl

The generic element results template. This file typically resides in the /res_templates directory.

Chapter 6: Unsupported Neutral File Packets PATRAN 2 Neutral File Preference Guide

6

Unsupported Neutral File Packets 

Main Index

Unsupported Neutral File Packets

104

104 PATRAN 2 Neutral File Preference Guide Unsupported Neutral File Packets

Unsupported Neutral File Packets The intent of the PATRAN 2 Neutral File Preference is to support as much of the PATRAN 2 Neutral File contents as possible. However, a few Data Packets remain unsupported.

Packet

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Description

Packet 09

Bar element initial displacements

Packet 12

Degree-of-freedom (DOF) lists

Packet 13

Mechanism Entities

Packet 36

Data-line data

Packet 37

Data-patch data

Packet 38

Data-hyperpatch data

Packet 40

LIST card

Packet 41

DATA card

Packet 46

Primitive data

Packet 47

Primitive face data

Packet 48

Field data (PCL format)

jp`Kc~íáÖìÉ=nìáÅâ=pí~êí=dìáÇÉ

Index PATRAN 2 Neutral File Preference Guide

fåÇÉñ Index

A

analysis, 92 Analysis Preferences, 6 analysis type, 7 structural, 7, 25 thermal, 7, 25

B

base.db, 4

C

composite materials Halpin-Tsai, 41 Rule of Mixtures, 41 coordinate frame, 8

E

element properties, 46 generic 0D, 46, 48 generic 1D, 46, 49 generic 2D, 46, 50 generic 3D, 46, 51

F

finite elements, 9

H

Halpin-Tsai, 41

L

LBCs, see load and boundary conditions

Main Index

load and boundary conditions, 53 convection, 53, 71 displacement, 53, 54 force, 53, 57 heat flux, 53, 75 heat source, 53, 81 pressure, 53, 60 temperature, 53, 64 view factor, 53, 85 load cases, 89 load_patran2nf(), 4

M

materials, 25 2D anisotropic, 25, 34 2D orthotropic, 25, 28 3D anisotropic, 25, 37 3D orthotropic, 25, 31 composite, 25, 41 composite, also see composite materials, 41 isotropic, 25 laminate, 41 structural isotropic, 27 thermal anisotropic, 44 thermal isotropic, 43 MPCs, see multi-point constraints multi-point constraints, 11 degrees-of-freedom, 15 explicit, 13, 16 linear surface to surface (LSS), 13, 18 linear surface to volume (LSV), 13, 19 linear volume to volume (LVV), 13, 20 quadratic surface to surface (QSS), 14, 21 quadratic surface to volume (QSV), 14, 22 quadratic volume to volume (QVV), 14, 23 rigid (fixed), 13, 17 rigid (pinned), 13, 17 slide, 14, 24

106 PATRAN 2 Neutral File Preference Guide

N

neutral file export, 93 import, 93 Packet 01, 9 Packet 02, 10 Packet 03, 25 Packet 04, 46 Packet 05, 8 Packet 06, 60 Packet 07, 57 Packet 08, 54 Packet 09, 104 Packet 10, 64 Packet 11, 64 Packet 12, 104 Packet 13, 104 Packet 14, 11 Packet 15, 81 Packet 16, 75, 81 Packet 17, 71 Packet 19, 85 Packet 36, 104 Packet 37, 104 Packet 38, 104 Packet 40, 104 Packet 41, 104 Packet 46, 104 Packet 47, 104 Packet 48, 104 unsupported packets, 104 nodes, 9

P

patran2nf.plb, 3

R

results file templates, 96 Rule of Mixtures, 41

S

structural, 7

Main Index

T

template.db, 4 thermal, 7

U

unsupported neutral file packets, 104