An aluminum bar subjected to tensile forces P has length L = 150 in. and cross-sectional area A = 2.0 in.2 The stress-strain behavior of the aluminum may be represented approximately by the bilinear stress-strain diagram shown in the figure.
Calculate the elongation δ of the bar for each of the following axial loads: P = 8 k, 16 k, 24 k, 32 k, and 40 k. From these results, plot a diagram of load P versus elongation δ (load-displacement diagram).

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12,000 psi | / E2 = 24 106 psi E,-10 10% psi