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| The
yield stress defines the boundary between the elastic and plastic response
of a material. Above the yield stress the material will deform plastically,
below the yield stress the material response is elastic.
The exact location of this elastic-plastic boundary, P, is hard to determine and an offset yield stress (proof stress), sy, has been defined as that stress which produces a given permenant plastic deformation in the sample. Typically, the permenant strain has the value 0.002. |
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| From: Callister, "Materials Science and Engineering," Wiley (1997) | |||||||||||