Drawing Load, Drawing Stress and Work Done

Q.

Common Data Question
A cup is to be drawn to a diameter of $70mm$ with $35mm$ depth from a $0.5mm$ thick sheet metal. The cup is drawn in one operation. Assume ${\sigma }_u=430MPa$

The maximum drawing force is

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

Q. Common Data Question
A cup is to be drawn to a diameter of $70mm$ with $35mm$ depth from a $0.5mm$ thick sheet metal. The cup is drawn in one operation. Assume ${\sigma }_u=430MPa$

The required blank diameter is

1. $86.7mm$
2. $119.5mm$
3. $121.24mm$
4. $169mm$