Using the data for aluminum given in Problem #2, plot the true stress-true strain curve of Al over the stress-strain range for which this is possible. Compare the engineering and true strain at the necking point.

Data From problem 2.

The tensile stress-strain behavior of pure aluminum is shown in the graphs following. Determine the following properties for pure Al. a) Young’s modulus, b) 0.2% offset yield strength, c) tensile strength and d) engineering fracture strain.

150 10 60 Polycrystalline aluminum Aluminum - 100- 15 low-strain region 10 20 01 0.2 03 0.4 0 0.001 0.002 0.003 0.004 a (MN/m)- 50 a (10' psi) a (MN/m") - +(sd o1) o