Mechanics of solids Starting from Hooke's Law for normal stress and the definitions of stress and strain, Derive the force-displacement relation describing elongation of a member: delta = PL/EA Give...

Starting from Hooke's Law for normal stress and the definitions of stress and strain, Derive the force-displacement relation describing elongation of a member: delta = PL/EA Give the prismatic criteria and one other key assumption about the member must we make for the force-displacement equation above to be valid? For the 2 indeterminate cases below, what are the compatibility equations for each?