Problem 1 A cylindrical rod of cross-sectional area Ar is inserted into a tube of the same length L and of cross- sectional area At. The left ends of the rod and tube are attached to a rigid support and the right ends to a rigid plate. The rod and tube are both made of perfectly elastoplastic materials (Rod: Er, Syr, Tube Et, Syt). a) Draw the stress strain curve of the rod and tube materials When an axial load P is applied: b) Determine the elastic limit load and displacement c) Determine the maximum limit load and displacement d) Draw the tube-rod assembly load-displacement curve L= 1.2 m, Cross-section areas: Ar = 45 mm, At = 60 mm, Young's modulus: Er = 200 GPa, Et = 100 GPa, Yield stress: Syr = 250 MPa, Syt = 310 MPa Rod Tube B P Rigid plate