For 50% penetration of work material, a punch with single

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For 50% penetration of work material, a punch with single shear equal to thickness will

1. reduce the punch load to half the value
2. increase the punch load by half the value
3. maintain the same punch load
4. reduce the punch load to quarter load

Correct Option: A

Punch load = π Dt τ		P
		t₁

t₁ = shear on punch.
P = 50%

Punch load = π Dt τ ×	0.5t
	t

⇒ 0.5 π Dt τ