Question: A tensile specimen is elongated to twice its original length. Determine the engineering strain and true strain for this test. If the metal had been strained in compres-sion, determine the final compressed length of the spec-imen such that
(a) the engineering strain is equal to the same value as in tension (it will be negative value be-cause of compression), and
(b) the true strain would be equal to the same value as in tension (again, it will be negative value because of compression).
Note that the answer to part (a) is an impossible result. True strain is theiefore a better measure of strain during plastic de-formation.