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Question

A hole of 40mm diameter is pierced in a steel sheet of 4mm thickness without shear on the tool. Shear strength of steel is 400N/mm2 and penetration is 25%. What is the expected percentage load reduction if a shear of 1mm is provided on the punch?

A
25.00
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B
33.33
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C
50.00
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D
66.67
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Solution

The correct option is C 50.00
As s=pt
F=FmaxKtKt+S=Fmax×0.25×40.25×4+1=Fmax2
Hence, 50% reduction in punching load.

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