2. (15') Consider a cylindrical steel specimen with 10 mm in diameter and 70 mm long under tensile test. Its tensile stress-strain curve is plotted below
600 500 400 500 Stress (MPa) 300 400 300 Stress (MPa) 200 200 100 100 - 0.000 0.006 0.002 0.004 Strain 0.024 0.00 0.04 0.12 0.16 0.20 0.08 Strain a. (2) Based on the close-up of the stress - strain behavior, determine the yield strength of the specimen from the diagram. b. (5') When a tensile load of 7000 N is applied to this specimen, will it yield? Please explain why. C. (4') Determine the plastic deformation of the specimen when loaded up to 500MPa. d. (4') What is the length of the specimen after unloading from 500MPa?
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