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Glossary of Materials Testing Terms
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Strain
Change per unit length in a linear dimension of a part or specimen, usually expressed in % Strain, as used with most mechanical tests, is based on original length of the specimen. True or natural strain is based on instantaneous length, and is equal to: ln X l lo , where l is instantaneous length and lo is original length of the specimen. Shear strain is the change in angle between two lines originally at right angles.
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