고체역학 (Beer) — Torsion: Problem 3.40

3.40 The solid spindle AB has a diameter \( d_s = 1.5 \text{ in.} \) and is made of a steel with \( G = 11.2 \times 10^6 \text{ psi} \) and \( \tau_{\text{all}} = 12 \text{ ksi} \), while sleeve CD is made of a brass with \( G = 5.6 \times 10^6 \text{ psi} \) and \( \tau_{\text{all}} = 7 \text{ ksi} \). Determine the largest angle through which end A can be rotated.