고체역학 (Beer) — Stress and Strain—Axial Loading: Problem 2.109

2.109 Each cable has a cross-sectional area of \(100 \text{ mm}^2\) and is made of an elastoplastic material for which \(\sigma_Y = 345 \text{ MPa}\) and \(E = 200 \text{ GPa}\). A force \(\mathbf{Q}\) is applied at \(C\) to the rigid bar \(ABC\) and is gradually increased from \(0\) to \(50 \text{ kN}\) and then reduced to zero. Knowing that the cables were initially taut, determine (a) the maximum stress that occurs in cable \(BD\), (b) the maximum deflection of point \(C\), (c) the final displacement of point \(C\). (Hint: In part \(c\), cable \(CE\) is not taut.)