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10 mm diameter holes are to be punched in a steel sheet of 3 mm thickness. Shear strength of the material is 400 N/mm2 and penetration is 40%. Shear provided on the punch is 2 mm. The blanking force during the operation will be
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- 22.6 kN
- 37.7 kN
- 61.6 kN
- 94.3 kN
- 22.6 kN
Correct Option: A
Given, Shear strength, τ = 400 N/mm2, Sheet thickness, t = 3 mm Diameter of hole, d = 10 mm, Shear on punch, t1 = 2 mm
Penetration of punch on fraction, 2p = 0.4
| Blanking force when shear is applied on the punch = πdt |  |  | τ | |
| t1 |
| = π × 10 × 3 × 400 × | | | = 22.61 kN | |
| 2 |
