– Data are given in Table P8.50 for compact specimens of 7075-T651 aluminum in the same sizes as those photographed in Fig. 8.47. All had dimensions, as defined in Fig. 8.16, of b = 50.8 and h = 30.5 mm, and initial sharp precracks and thickness as tabulated. For each test, perform the following tasks: (a) Calculate K Q, and determine whether or not K Q qualifies as a valid (plane strain) KI c. (b) Estimate the plastic zone size at K Q, using 2roσ or 2roε as applicable. (c) Determine whether analysis by LEFM is applicable. (d) Plot K Q versus thickness t, and comment on the trend observed and its relationship to the fracture surfaces in Fig. 8.47. (e) For each test, employ the crack length ai and Fig. A.16(c) in Appendix A to estimate the fully plastic force. Then compare these values to the highest forces Pmax reached prior to fracture. What is the significance of the trend observed?