Let us consider the following engineering stress-strain curve from an Al alloy. The diameter of Al bar is 10 mm. (a) Determine the elastic modulus E and the yield strength (Y.S.). (b) Sketch the shape change of tensile specimen at the points 1, 2 and 3. (c) Calculate the elastic recovery that would occur upon removal of the load at the point of tensile strength. 80 70 60 50 40 Stress (N/mm) 30 20 10 0 0 1 0.02 0.04 0.06 Strain 0.08 0.1 0.12