6. consider a plate containing a center crack with 2a = 0.2 in. the yield stress of the material is 0o = 90 ksi. the plate is under remote tensile stress o = 30 ksi which is perpendicular to the center crack plane. answer the following questions: estimate the plastic zone size 2rp. (consider both the plane stress and the plane strain conditions) (0.0111 in, 0.0037 in) check the validation of linear elastic fracture mechanics (lefm) for this plate 6) sa, bih c) repeat the process in a) and b) for the yield stress 0o = 45 ksi. (0.0444 in, 0.0148 identify the relationship between 0 and 2rp. what is the effect of plate thickness on the plastic zone size.