Problem 1 An engineering memebr is to be made of 18-Ni maraging steel (vacuum melted). The memebr is a plate loaded in tension, and it may have a crack in one edge (shown as figure c). The dimensions are width b = 35 and t = 5 mm, and the crack may be as long as a = 7 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. b (b) 5 K=FS/X F P (a,b) 4 (c) (c) 3 2 1 (a) (b) 0 0.2 04 0.6 0.8 1.0 "Hab Values for small a/b and limits for 10% accuracy: (a) K=S (a/b 0.4) (b) K 1.125 (a/b 0.6) (c) K=1.125a (a/b0.13) Expressions for any = a/b: (a) F- 1-0.50 +0.326a (b) F= (1+0.122 cos) (h/b1.5) 2 tan (h/b2) 2 (c) F 0.265 (1-a)+ 0.857+0.265 (1-3/2 (h/b1)