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A part made from annealed AISI 1018 steel undergoes a 20% cold work operation. Prior to cold working, the yield and ultimate strength of this steel are 32 kpsi and

49.5 kpsi,respectively. In addition, the ultimate strain and fracture strain of this steel are 0.25 and1.05, respectively. The strength coefficient and strain-strengthening exponent assume values of 90 kpsi and 0.25, respectively. Estimate the yield strength and ultimate strength of this material after cold working.

Fig: 1