고체역학 (Gere) — Axially Loaded Members: Problem 2.6-8

2.6-8 A copper bar with a rectangular cross section is held without stress between rigid supports (see figure). Subsequently, the temperature of the bar is raised 50°C. (a) Determine the stresses on all faces of the elements A and B, and show these stresses on sketches of the elements. (Assume \(\alpha = 17.5 \times 10^{-6}/^\circ\text{C}\) and \(E = 120\text{ GPa}\).) (b) If the shear stress at B is known to be 48 MPa at some inclination \(\theta\), find angle \(\theta\) and show the stresses on a sketch of a properly oriented element.