500 developing a new generation of aluminum alloy from 2014-T6 with a promising virus-resistant surface property. Before it can be explored for use of parts in 400 public transportation, the aluminum was tensile tested in order to meet the Federal and Industrial standards for 300 300 manufacturing. A representative tensile stress-strain Stress (MPa) 200 Stress (MPa) behavior of the aluminum specimen (L = 30 mm and d = 200 100 3 mm) and its corresponding fatigue life are shown in the Figures to the right. (Please mark your work on the 100 D 0.01 D.02 0.03 graph.) Strain (mm/mm) a) Determine the modulus of elasticity for the Al alloy b) Determine the elongation of the specimen when the 0.03 0.06 0.09 0.12 0.15 applied load is 2850 N. Strain (mm/mm) c) Determine the tensile strength of the Al alloy. d) If the plane-strain fracture toughness of the 2014-T6 400 Al is 55 MPavm with an internal crack length of 3 mm, will the fracture occur at 380 MPa when the 300 crack length is 5 mm? Why and why not? Max. Stress, S ( MPa) 2014-T6 Al alloy e) For a cylindrical sample having 30 mm in length and 200 3 mm in diameter, what is its fatigue life if the cyclic loads are + 26.5 N? 100 104 105 10" 107 101 10 Cycles to Failure, N