1. The graph shows the flow stress (plastic true stress-strain curve) of an annealed copper alloy...

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1. The graph shows the flow stress (plastic true stress-strain curve) of an annealed copper alloy which was measured in uniaxial compression. The strain-hardening coefficient is n = 0.45 and the elastic modulus is E = 145 GPa. 800 True or Engineering Stress (MPa) 700 600 500 400 300 200 100 0 0.1 0.2 0.3 0.4 0.5 True or Engineering Strain 0.6 0.7 0.8 Assuming the flow stress in compression and tension are the same, construct the corresponding engineering stress-strain curve on the same graph as follows: (a) Calculate the ultimate tensile strength (UTS) and strain and plot and label the point. (10 pts) (b) Estimate the yield strength (Y) and strain and plot and label the point. (5 pts) (c) Sketch a qualitative engineering-stress strain curve from Y to fracture. Assume a fracture stress of UTS/2 and the corresponding strain based a ductility of 44 % elongation. (5 pts) (d) Estimate the Vickers hardness in the part of the gage section that underwent only uniform elongation. (5 pts) 1. The graph shows the flow stress (plastic true stress-strain curve) of an annealed copper alloy which was measured in uniaxial compression. The strain-hardening coefficient is n = 0.45 and the elastic modulus is E = 145 GPa. 800 True or Engineering Stress (MPa) 700 600 500 400 300 200 100 0 0.1 0.2 0.3 0.4 0.5 True or Engineering Strain 0.6 0.7 0.8 Assuming the flow stress in compression and tension are the same, construct the corresponding engineering stress-strain curve on the same graph as follows: (a) Calculate the ultimate tensile strength (UTS) and strain and plot and label the point. (10 pts) (b) Estimate the yield strength (Y) and strain and plot and label the point. (5 pts) (c) Sketch a qualitative engineering-stress strain curve from Y to fracture. Assume a fracture stress of UTS/2 and the corresponding strain based a ductility of 44 % elongation. (5 pts) (d) Estimate the Vickers hardness in the part of the gage section that underwent only uniform elongation. (5 pts)