고체역학 (Gere) — Torsion: Problem 3.5-2

3.5-2 A circular steel tube with an outer diameter of 75 mm and inner diameter of 65 mm is subjected to torques T at its ends. Calculate the maximum permissible torque \(T_{max}\) if the allowable normal strain is \( \epsilon_a = 5 \times 10^{-4} \). Assume that \(G = 75\) GPa.