The 2000 mm long composite bar shown in Figure 1.46 consists of an aluminum bar having a modulus of elasticity E_Al = 70 GPa and length L_Al = 500 mm, which is securely fastened to a steel bar having modulus of elasticity E_St = 210 GPa and length L_St = 1500 mm. After the force P is applied, a tensile normal strain of ε_AL = 1000 × 10−6 is measured in the aluminum bar.
Find the tensile normal stress in each bar and the total elongation of the composite bar.

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P -0 FIGURE 1.46 Steel Aluminum 500 mm 1500 mm P