The maximum drawing force is

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Direction: A cup is to be drawn to a diameter of 70 mm with 35 mm depth from a 0.5 mm thick sheet metal. The cup is drawn in one operation. Assume σ_u = 430 MPa.

The maximum drawing force is

1. 0.047 MN
2. 0.082 MN
3. 0.83 MN
4. 9.69 MN

Correct Option: B

Drawing force = πDtτ
= π × 121.24 × 0.5 × 430 = 0.082 MN