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This question belongs to Mechanical Engineering Machine Design

Machine Design

?

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 $${\tau _{\text{u}}}$$ = Ultimate shear strength of the material of the plate)

A) $${\text{dt}}{\tau _{\text{u}}}$$ B) $$\pi {\text{dt}}{\tau _{\text{u}}}$$ C) $$\frac{\pi }{4} \times {{\text{d}}^2}{\tau _{\text{u}}}$$ D) $$\frac{\pi }{4} \times {{\text{d}}^2} \times {\text{t}}{\tau _{\text{u}}}$$

Answer & Solution

Correct Answer: Option B

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