A cylindrical specimen of a brass alloy 7.5 mm (0.30 in.) in diameter and 90.0 mm (3.54 in.) long is pulled in tension with a force of 6000 N (1350lb_f); the force is subsequently released.

(a) Compute the final length of the specimen at this time. The tensile stress?strain behavior for this alloy is shown in Figure 6.12.

(b) Compute the final specimen length when the load is increased to 16,500 N (3700lb_f) and then released.

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500 70 Tensile strength 450 MPa (65,000 psi) 60 400 50 10° psi MPa 40 300 40 30 200 Yield strength 30 250 MPa (36,000 psi) 200 20 100 20 10 100 10 0.005 0.10 0.20 0.30 0.40 Strain Stress (MPa) (sd 01) sseas