고체역학 (Gere) — Analysis of Stress and Strain: Problem 7.2-3

7.2-3 The stresses on an element are \(\sigma_x = 7 \text{ MPa}\), \(\sigma_y = 3.5 \text{ MPa}\), and \(\tau_{xy} = 2.4 \text{ MPa}\). Find the stresses acting on an element oriented at an angle \(\theta = 25^\circ\). Show these stresses on the rotated element.