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Question

# 10 mm diameter holes are to be punched in a steel sheet of 3 mm thickness. Shear strength of the material is 400 N/mm2 and penetration is 40%. Shear provided on the punch is 2 mm. The blanking force during the operation will be

A
22.6 kN
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B
37.7 kN
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C
61.6 kN
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D
94.3 kN
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Solution

## The correct option is A 22.6 kN Shear strength: τ=400N/mm2 Sheet thickness: t=3m Diameter of hole: d=10mm Shear on punch: t1=2mm Penetration of punch in fraction, p=0.4 Blanking force when shear is applied on the punch =πdt(tpt1)τ=π×10×3×(3×0.42)×400=22.6kN

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