2. Plot Crack tip plastic zone shapes estimated from the elastic solution and the von Mises yield criterion. 1) For Plane Stress, 2) For Plane Strain, 1 K, ys r (0) 1 K, I ys = 1 3 1+ cos 0 +-sin 0 = 2 sin 3 1 = = = (1-2) (1+ cos 0)+ sin 20 (1+cose) 2 3