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An
ideal plastic material is one that experiences no work-hardening during
plastic deformation. The stress-strain curve shown in the diagram is for
an ideal elastoplastic material which has linear elastic properties up
to the yield stress and then ideal plastic properties. If the material
is unloaded after reaching some deformation strain, it will recover its
elastic strain component as shown by the red line on the diagram. Reapplication
of the stress will result in retracing the red (elastic) line until the
yield stress is reached and then increasing the plastic deformation along
the black curve. The stress-strain diagram represented shows shear stress
and shear strain, a situation that would apply to the torsional loading
of a shaft. |
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