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.

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