It is require to punch a hole of diameter 10 mm on a sheet

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It is require to punch a hole of diameter 10 mm on a sheet of thickness 3 mm. The shear strength of the work material is 420 MPa. The required punch force is

1. 19.78 kN
2. 39.58 kN
3. 98.9 kN
4. 395.6 kN

Correct Option: B

Punching force = πDtτ
= π × 10 × 3 × 420 = 39.58 KN