In a typical tension test a dog bone shaped specimen is pulled in a machine. During the
Question:
σe = F/A0 and εe = L €“ Lo/L0, where L0 and A0 are the initial gauge length and the initial cross-sectional area of the specimen, respectively. The true stress σt and strain εt are defined by σt = F/A0 L/L0 and εt = ln L/L0.
The following are measurements of force and gauge length from a tension test with an aluminum specimen. The specimen has a round cross section with radius 6.4 mm (before the test). The initial gauge length is L0 = 25 mm. Use the data to calculate and generate the engineering and true stress-strain curves, both on the same plot. Label the axes and use a legend to identify the curves. Units: When the force is measured in newtons (N) and the area is calculated in m2, the unit of the stress is pascals (Pa).
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