고체역학 (Beer) — Stress and Strain—Axial Loading: Problem 2.118

2.118 Solve Prob. 2.117, assuming that the temperature of the rod is raised to 150°C and then returned to 25°C. 2.117 The steel rod ABC is attached to rigid supports and is unstressed at a temperature of 25°C. The steel is assumed elastoplastic with \(E = 200 \text{ GPa}\) and \(\sigma_Y = 250 \text{ MPa}\). The temperature of both portions of the rod is then raised to 150°C. Knowing that \(\alpha = 11.7 \times 10^{-6}/^{\circ}\text{C}\), determine (a) the stress in both portions of the rod, (b) the deflection of point C. From Fig. P2.117: Portion AC: \(L_1 = 150 \text{ mm}\), \(A_1 = 500 \text{ mm}^2\) Portion CB: \(L_2 = 250 \text{ mm}\), \(A_2 = 300 \text{ mm}^2\)