A cylindrical specimen of a brass alloy having a length of 60 mm (2.36 in.) must elongate only 10.8 mm (0.425 in.) when a tensile load of 50,000 N (11,240lbf) is applied. Under these circumstances, what must be the radius of the specimen? Consider this brass alloy to have the stress-strain behavior shown in Figure.

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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 Stess (MPa) (sd ot) ssens