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)

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

1.	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)
A.	d.t.τu
B.	πd.t.τu
C.	π/4 × d².τu
D.	π/4 × d² × tτu
Answer» C. π/4 × d².τu

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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)

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