– An engineering member is mad

– An engineering member is made of 300-M (650◦C temper) steel. It is in the shape of a plate loaded in tension and may have a crack in one edge, as shown in Fig. 8.12(c). The dimensions are width b = 80 mm and thickness t = 20 mm, and the member must resist a tension force of P = 150 kN. Determine the length a of the largest edge crack that can be permitted such that the safety factor against brittle fracture is not less than 3.5, and also the safety factor against fully plastic yielding is not less than 2.5.

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