For the same material and member as in Prob. 11.37, the initial crack length is a_i = 0.5 mm, and the load history is replaced by repeated applications of the sequence shown in Fig. P11.52. Estimate the number of repetitions to failure.

 

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MW-WM time one repettion Figure P11.52 M. Moment, N-m MW-WM time one repettion Figure P11.52 M. Moment, N-m

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Express the maximum nominal stress Here shaft radius is thickness is t and maximum bending moment is Substitute for 12 mm for t and 60 mm for b step 2 ... View the full answer