A hydraulic press is used to produce circular blanks of

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A hydraulic press is used to produce circular blanks of 10 mm diameter from a sheet of 2 mm thickness. If the shear strength of the sheet material is 400 N/mm2, the force required for producing a circular blank is

1. 8 kN
2. 25.13 kN
3. 31.42kN
4. 125.66 kN

Correct Option: B

Punching force = π Dt τ
= π × 2 × 10 × 400 = 25.13 KN