Calculate the moduli of resilience for the materials having the stress?strain behaviors shown in Figures 6.12 and 6.21.

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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 100F 20 10 100 10 0.005 0.10 0.20 0.30 0.40 Strain 300 2000 10° psi 300 MPa 2000 200 200 1000 1000 100 100 0.000 0.005 0.010 0.015 Strain 0.000 0.020 0.040 0.060 0.080 Strain Stress (MPa) Stress (M Pa) Stress Stress (10 psi) Stress (10 psi)