8-1. A tension test was performed on a steel specimen having an original diameter of 12.5 mm and gauge length of 50 mm. The data is listed in the table. Plot the stress- strain diagram and determine approximately the modulus of elasticity, the yield stress, the ultimate stress, and the rupture stress. Use a scale of 25 mm = 140 MPa and 25 mm = 0.05 mm/mm. Redraw the elastic region, using the same stress scale but a strain scale of 25 mm-0.001 mm/mm. Load (kN) Elongation (mm) 0 0 7.0 0.0125 21.0 0.0375 36.0 0.0625 50.0 0.0875 53.0 0.125 53.0 0.2 54.0 0.5 75.0 1.0 90.0 2.5 97.0 7.0 87.8 10.0 83.3 11.5 Prob. 8-1