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Why Poisson's ratio different in the elastic and plastic region? Is Poisson's ratio usually bigger in...

Why Poisson's ratio different in the elastic and plastic region?

Is Poisson's ratio usually bigger in the plastic region for metals? WHY??

Engineering   Mechanical-Engineering   
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In elastic region material regains its shape during unloading.But in plastic region material deformed permanantly.poisson'ratio is defined as the ratio of lateral strain to longitudinal strain.in case of plastic deformation value of lateral strains are higher compare to elastic region.

so for plastic regions value of poisson'ratio is higher compare to elastic region. usually for the metals value of poisson's ratio for elastic region is 0.3 and for plastic region it is 0.5.

answered by: anonymous
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