Estimate the Brinell and Rockwell hardnesses for the following:

(a) The naval brass for which the stress?strain behavior is shown in Figure 6.12.

(b) The steel alloy for which the stress?strain behavior is shown in Figure 6.21.

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Part a 500 70 Tensile strength 450 MPa (65,000 psi) 60 400 50 10 psi 40 MPa 300 40 30 200 Yield strength 30 200 250 MPa (36,000 psi) 20 100 20 10 100 10 0.005 0.20 0.10 0.30 0.40 Part b 300 2000 10° psi MPa 2000 300 200 200 1000 1000 100 100 0. 0.000 0.005 0.010 0.015 Strain 0.000 0.020 0.040 0.060 0.080 Strain Stress (MPa) Stress (MPa) Stress Stress (10 psi) Stress (10° psi)