From the uniaxial stress-strain responses for various metals shown in Figure. Find the yield stress (or if appropriate a 0.2% proof stress), the tensile [10 marks] strengths and the ductility of alloys shown in the table below. Account for the differences in strength, comparing copper with Brass and mild steel with medium carbon steel. a. b. Stress On (MPa) Material 800 700 600 500 400 300 200 100 0 Annealed Copper Annealed Brass Mild Stee Medium C Steel 10 Al alloy Medium carbon steel Drawn brass 20 30 Mild steel Annealed, copper 40 Strain En (%) Annealed brass 50 60 Yield stress, oy (MPa) Tensile strength, OUTS (MPa) Ductility, ef (%)