When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the

Question

When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)

Options:

A . d.t.τu

B . πd.t.τu

C . π/4 × d².τu

D . π/4 × d² × tτu

Answer: Option B

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