For perfectly plastic material, Poisson’s ratio is equal to ________

For perfectly plastic material, Poisson’s ratio is equal to ________ Correct Answer 0.5

For the perfectly plastic material, volume change on deformation is zero. And the slope of the stress-strain curve is zero (as it is parallel to the x-axis) => E=3K(1-2ν) => 0=3K(1-2ν) => (1-2ν) = 0 => ν=1/2=0.5.
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