Q2/ A punch for making holes in steel plates is shown in fig.2a . Assume that a punch having diameter d = 20 mm is used to punch a hole in an 8 mm plate, as shown fig.2b, if a force P= 110 kN is required to create the hole , what is the average shear stress in the plate and the average compressive stress in the punch? (10 Marks) P P= 110 kN -d D20 mm T=8.0 mm (a) (b)