When a hole of diamete

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`tau_u` = Ultimate shear strength of the material of the plat

Options:

A . `d.t.tau_u`

B . `pi d.t.tau_u`

C . `pi/4 xx d^2 tau_u`

D . `pi/4 xx d^2 xx t tau_u`

Answer: Option B

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