Question: Problem 4 . [ 1 0 Marks ] ( a ) A solid shaft of diameter D = 5 0 m m rotates and carries

Problem 4.[10 Marks]
(a) A solid shaft of diameter D=50mm rotates and carries the minor shock loading as shown in figure. Calculate the fatigue safety factor n and yielding factor of safety ny for the shaft. Given: D=75mm,Sy=550MPa, Su=660MPa. The torque fluctuates 5% each way from the mean value, and the shaft is to be machined from unnotched steel. [5 Marks]
Problem 4 . [ 1 0 Marks ] ( a ) A solid shaft of

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