Shown is the stress-strain curve developed from the tension test of a steel bar. The specimen used to develop the stress-strain curve has a round cross-section with a diameter of d = 0.36 in. and a gauge length of L = 5 in. If the specimen is stressed to 90 ksi and unloaded, determine the permanent change in length of the bar after unloading. Express your answer in inches to the nearest 0.001 in. Your written solution must also include the following: 1. Calculation of E for this steel 2. The load that must be applied to the bar (in kip) to yield the bar 3. The length of the bar (in inches) when it ruptures a (ksi) 105 90 75 60 45 30 15 (in./in.) 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.001 0.003 0.004 0.005 0.006 0.07

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