고체역학 (Gere) — Torsion: Problem 3.3-12

3.3-12 A propeller shaft for a small yacht is made of a solid steel bar 104 mm in diameter. The allowable stress in shear is 48 MPa, and the allowable rate of twist is \(2.0^\circ\) in 3.5 meters. (a) Assuming that the shear modulus of elasticity is \(G = 80 \text{ GPa}\), determine the maximum torque \(T_{\max}\) that can be applied to the shaft. (b) Repeat part (a) if the shaft is now hollow with an inner diameter of \(5d/8\). Compare \(T_{\max}\) values to corresponding values from part (a).