고체역학 (Beer) — Stress and Strain—Axial Loading: Problem 2.113

2.113 The rigid bar $ABC$ is supported by two links, $AD$ and $BE$, of uniform $37.5 \times 6\text{-mm}$ rectangular cross section and made of a mild steel that is assumed to be elastoplastic with $E = 200\text{ GPa}$ and $\sigma_Y = 250\text{ MPa}$. The magnitude of the force $Q$ applied at $B$ is gradually increased from zero to $260\text{ kN}$. Knowing that $a = 0.640\text{ m}$, determine (a) the value of the normal stress in each link, (b) the maximum deflection of point $B$.