고체역학 (Gere) — Torsion: Problem R-3.10

R-3.10 A hollow aluminum shaft (\(G = 27 \text{ GPa}\), \(d_2 = 96 \text{ mm}\), and \(d_1 = 52 \text{ mm}\)) has an angle of twist per unit length of \(1.8^\circ/\text{m}\) due to torques \(T\). The resulting maximum tensile stress in the shaft is approximately: (A) \(38 \text{ MPa}\) (B) \(41 \text{ MPa}\) (C) \(49 \text{ MPa}\) (D) \(58 \text{ MPa}\)