고체역학 (Gere) — Axially Loaded Members: Problem 2.6-18

2.6-18 A prismatic bar is subjected to an axial force that produces a tensile stress \(\sigma_\theta = 65 \text{ MPa}\) and a shear stress \(\tau_\theta = 23 \text{ MPa}\) on a certain inclined plane (see figure). Determine the stresses acting on all faces of a stress element oriented at \(\theta = 30^\circ\), and show the stresses on a sketch of the element.