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If the width is decreased by 20% and length is elongated by 30%. Find the plastic strain ratio of the workpiece?

If the width is decreased by 20% and length is elongated by 30%. Find the plastic strain ratio of the workpiece? Correct Answer 5.71

The plastic strain ratio is defined as: -> ln(Wi/Wf)/ln(LfWf/LiWi) -> ln(w/0.8w)/ln(1.3L*0.8W/L*W) -> ln(1/0.8)/ln(1.3*0.8) -> 0.223/0.039 -> 5.71.

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