Stress Strain Example

Stress-strain curve data from a tension test on hotrolled AISI 1095 steel are in the figure. Curve 1 shows the initial part of the data plotted at a sensitive strain scale (lower scale), and curve 2 shows all of the data to fracture (upper scale). The diameter before testing was 9.07mm, and minimum diameter in the necked region, measured from the fittedtogether broken ends of the specimen, was 8.18mmmm. Determine the following: elastic modulus E, also 0.2% offset yield strength, ultimate strength percent elongation, reduction of area, true stress & true strain at the maximum load, true fracture strain, and true fracture strength. /-;

E. Strain (Curve 2) 0.08 0.04

1200

1000 120

800 2 ,g 600 ti)

1

400 40 200

frtio, — 40 NO9os

20

It)

0 12 160

ct o

CIO We. =

ft ( c o

n

It1004 0 008 tat Strain (Curve 1)

0

0 012

E.

Er (c),o as)

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c

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