2- The load--extension curve of an aluminum alloy, shown in Figure E3.5.1 was taken directly from...

 

 

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2- The load--extension curve of an aluminum alloy, shown in Figure E3.5.1 was taken directly from a testing machine. A strain-gage extensometer was used, so machine stiffness effects can be ignored. From this curve, obtain the true and engineering stress-strain curves. Also, calculate the following parameters: Lo 50 mm; Do = 5 mm and D = 4 mm 19 10 80 7 Force (kN) 5 4 6 3 2 1 0 1 2 3 4 Change in length (mm) a) Young's modulus b) the UTS c) the 0.2%-offset yield stress d) the uniform strain e) the total strain f) the reduction in area at the fracture. 5 2- The load--extension curve of an aluminum alloy, shown in Figure E3.5.1 was taken directly from a testing machine. A strain-gage extensometer was used, so machine stiffness effects can be ignored. From this curve, obtain the true and engineering stress-strain curves. Also, calculate the following parameters: Lo 50 mm; Do = 5 mm and D = 4 mm 19 10 80 7 Force (kN) 5 4 6 3 2 1 0 1 2 3 4 Change in length (mm) a) Young's modulus b) the UTS c) the 0.2%-offset yield stress d) the uniform strain e) the total strain f) the reduction in area at the fracture. 5