An elastoplastic material with strain hardening has the stress–strain relationship shown in Figure . The modulus of elasticity is 25 * 106 psi, yield strength is 70 ksi, and the slope of the strain-hardening portion of the stress–strain diagram is 3 * 106 psi.a. Calculate the strain that corresponds to a stress of 80 ksi.b. If the 80-ksi stress is removed, calculate the permanent strain.

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