고체역학 (Beer) — Torsion: Problem 3.58

3.57 At a time when rotation is prevented at the lower end of each shaft, a 50-N·m torque is applied to end A of shaft AB. Knowing that G = 77.2 GPa for both shafts, determine (a) the maximum shearing stress in shaft CD, (b) the angle of rotation at A. 3.58 Solve Prob. 3.57, assuming that the 80-N·m torque is applied to end C of shaft CD.