Question

How much force is needed to punch a circular hole 1.2cm in radius in a metal plate of thickness 0.3 cm? The shear modulus of the metal is 150.0 x 106 N·m

Answer 1

$$F=SA=S*\pi *d*t\\ =150*10^6*3.14*(2*0.012)*0.003\\ =34000\:\rm N$$