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· Engineering stress and strain
are related by Hooke's
law in the elastic range with the slope of the line being
Youngs modulus, E.
· At
the end of the elastic range, P, the material starts to plastically deform and
removal of the applied stress does not return the material to its original
length.
· To provide a reproducible
measure of the transition between elastic and plastic behavior the Offset
Yield Stress, σy
, is defined as the stress that produces a permanent strain of 0.002
From:
Callister, "Materials Science and Engineering," Wiley (1997) |
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