A plate 4 in wide, 8 in long, and 0.5 in thick is loaded in tension in

Question:

A plate 4 in wide, 8 in long, and 0.5 in thick is loaded in tension in the direction of the length. The plate contains a crack as shown in Fig. 5–26 with the crack length of 0.625 in. The material is steel with KI c = 70 kpsi .√in, and Sy = 160 kpsi. Determine the maximum possible load that can be applied before the plate (a) yields, and (b) has uncontrollable crack growth.