8) A sample of unknown material is being stressed in a tensile testing machine. Stress is found to be linear with strain in the elastic region. When initially loaded f = 5 ksi, c = .0005, at a greater load, f = 20 ksi, = .002. Determine the E value for steel. Using information from the appendix, select a material that may have been the one tested. (3 pts.) E = Material selected