![]() ![]() ![]() ΔL is the change in length of the original gauge length measured after the specimen fractures and the specimen is fitted togetherĪ punch is often used to apply the gauge marks to each specimen. Elongation is expressed as a percentage of the original gauge length and is given by: Elongation is defined as the increase in the gauge length, L o, of a test piece subjected to tensile forces divided by the original gauge length. ![]() The conventional means by which we obtain Elongation is by pulling a specimen in tension until fracture. Elongation at Break or Elongation is one measure of ductility.
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