Using the data in Problem 6.28 and Equations 6.15, 6.16, and 6.18a, generate a true stress true strain plot for aluminum. Equation 6.18a becomes invalid past the point at which necking begins; therefore, measured diameters are given below for the last four data points, which should be used in true stress computations.

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Load Length Diameter lb 10,400 10100 9,600 8,200 nin 56.896 57.658 58.420 59.182 in 0.461 0.431 0.418 0.370 iHI 46,100 42,400 42,600 36,400 2.240 2.270 2.300 2.330 10.95 10.62 9.40