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) For Plane Stress, r., (0) 2) For Plane Strain, 1| K ys (0) 1 K ys r, (0) 1 K 2|. ys 3. Plot Crack tip plastic zone shapes estimated from the elastic solution and the Tresca yield criterion and compare with the results of Problem 2 (Extra Credit). r 1 (0) 1 K 2 0. 2 ys 1 40 = 1 + cos0+ - sin 0 3 2sin 1 (1-2v) (1+cose)+ = COS [14 2 1+ sin ] 3 + 2 sin0].0 = 1/ 3 2 2 = = cos [ 2 3 (1-2v)+ sin