Prob.#3(30%)
The assembly consists of two posts AB and CD each made from material 1 having a modulus of
elasticity of E1and a cross-sectional area A1, and a central post made from material 2 having a
modulus of elasticity E2 and cross-sectional area A2. If a load P is applied to the rigid cap, determine
the force in each material.(請注意:Free body diagram 、 Equilibrium equations 以及
Compatibility都必須清楚標示出來)