A steel alloy specimen having a rectangular cross section of dimensions 18.6 mm × 3.4 mm (0.7323 in. × 0.1339 in.) has the stress-strain behavior shown in the Animated Figure 6.22b. If this specimen is subjected to a tensile force of 105000 N (23600 lbf) then (a) Determine the amount of elastic strain induced. (b) Determine the amount of plastic strain induced. (c) If its original length is 690 mm, what will be its final length after this force is applied and then released? The elastic modulus for steel is 207 GPa

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Strain energy

The term strain indicates the variation in an object's length, area, and volume when the object is subjected to an external force. The external force may be of normal, shear, moment, torque, etc. The strain in an object depends on the types of external force and cross-section of the object. Mathematically, the evaluation of strain can be obtained with the help of elastic constants.