An engineering member is to be made of 18-Ni maraging steel (vacuum melted). The member is a plate loaded in tension, and it may have a crack in one edge as shown in Fig. 8.12(c). The dimensions are width b = 35 and 1= 5.0 mm, and the crack may be as long as a = 7.0 mm. The member must resist a tension force of P = 60 kN. Determine:

(a) the safety factor against brittle fracture,

(b) the safety factor against fully plastic yielding, and

(c) the overall (controlling) safety factor.