(f)How to define thin wall? (2%)

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)

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(f)How to define thin wall? (2%)

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