고체역학 (Gere) — Torsion: Problem 3.12-3

3.12-3 A full quarter-circular fillet is used at the shoulder of a stepped shaft having diameter \(D_2 = 25\text{ mm}\) (see figure). A torque \(T = 115\text{ N}\cdot\text{m}\) acts on the shaft. Determine the shear stress \(\tau_{max}\) at the stress concentration for values as follows: \(D_1 = 18, 20\) and \(22\text{ mm}\). Plot a graph showing \(\tau_{max}\) versus \(D_1\).