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

A hole of 40 mm diameter is pierced in a steel sheet of 4 mm thickness

1.	A hole of 40 mm diameter is pierced in a steel sheet of 4 mm thickness without shear on the tool. Shear strength of steel is 400 N/mm and penetration is 25%. What is the expected percentage load reduction if a shear of 1 mm is provided on the punch?
A.	25.00
B.	33.33
C.	50.00
D.	66.67
Answer» D. 66.67

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

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