Consider the brass alloy for which the stress-strain behavior is shown in the Animated Figure 7.12. A cylindrical specimen of this material 9.5 mm (0.3740 in.) in diameter and 98.2 mm (3.866 in.) long is pulled in tension with a force of 9000 N (2023 lbf). If it is known that this alloy has a value for Poisson's ratio of 0.35, compute (a) the specimen elongation, (b) the reduction in specimen diameter. Note: because the diameter decreases, enter a minus sign in your answer. (a) i mm (b) i mm Tensile strength 450 MPa (65,000 psi) Strain = 0 Stress = 0 MPA Stress = 0 psi 500 70 - Strain = 0 Stress = 0 MPA Stress = 0 psi 60 400 50 A 10B psi 40 MPa 300 Yield strength 250 MPa (36,000 psi) - 40 200 30 - Stress (MPa) 200 30 - 20 Stress (10 psi) 100 - 20 10 100 o - 10 o to.obs 0 0 0.10 0.20 0.30 0.40 Strain