PROBLEM 3.109 The magnitude of the torque T applied to the tapered shaft of Prob. 3.108 is slowly increased. Determine (a) the largest torque that may be applied to the shaft, (b) the length of portion BE that remains fully elastic. PROBLEM 3.108 A shaft of mild steel is machined to the shape shown and then twisted by torques of magnitude 40 kip · in. Assuming the steel to be elastoplastic with ?Y = 21 ksi, determine (a) the thickness of the plastic zone in portion CD of the shaft, (b) the length of portion BE that remains fully elastic.


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