고체역학 (Beer) — Torsion: Problem 3.115

3.114 The solid circular drill rod AB is made of a steel that is assumed to be elastoplastic with \(\tau_Y = 22 \text{ ksi}\) and \(G = 11.2 \times 10^6 \text{ psi}\). Knowing that a torque \(T = 75 \text{ kip}\cdot\text{in.}\) is applied to the rod and then removed, determine the maximum residual shearing stress in the rod. 3.115 In Prob. 3.114, determine the permanent angle of twist of the rod. Given Data from Figure P3.114: Length of rod, \(L = 35 \text{ ft} = 420 \text{ in.}\) Radius of rod, \(c = 1.2 \text{ in.}\) (based on visual inspection of the dimension line starting from the center of the shaft).