a) = Consider a Co-Cr alloy used for vascular stent application. The alloy has a fracture toughness of K;c = 60 MPaym, a yield strength of Quieid=547 MPa an ultimate tensile strength of 1449 MPa, a Young's modulus of E = 243 GPa a 30% total elongation at failure, and a fatigue limit of Sfax = 200 MPa. Use the information provided to the answer the following questions; i) Sketch a tensile stress-strain curve for this alloy. Label the values of the yield strength, the ultimate tensile strength, and the plastic strain at failure. 11) What features of the tensile stress-strain curve shown in your answer (1) would change if the alloy was cold worked? Explain your answer. [10 Marks] [CO2, PO2, C4] b) A cylindrical rod 500 mm long and 12.7 mm diameter is to be deformed using a tensile load of 29.000 N. It must NOT experience plastic deformation and the elongation must NOT more than 1.3 mm. Which of the four metals or alloys listed in Table 1 are possible candidates? Justify your choice(s). Table 1: Mechanical Properties of Metal Alloy Modulus of Material Elasticity (GPa) 70 Yield Strength Tensile Strength (MPa) (MPa) 255 420 100 345 420 Aluminum alloy Brass alloy Copper Steel alloy 110 210 210 207 450 550 [10 Marks) [CO2, PO2, C4] c) A sample of carbon steel has a tensile strength of 400 MPa and a percentage elongation of 35%. A sample of an aluminium-manganese alloy has a tensile strength of 140 MPa and a percentage elongation of 10%. What does this data tell you about the mechanical behavior of the materials? [5 Marks