Circular blanks of 10 mm diameter are punched from an aluminum

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Circular blanks of 10 mm diameter are punched from an aluminum sheet of 2 mm thickness. The shear strength of aluminum is 80 MPa. The minimum punching force required in kN is

1. 2.57
2. 3.29
3. 5.03
4. 6.33

Correct Option: C

Punching force = πDtτ
= π × 10 × 2 × 80 = 5.023 KN