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Glossary of Materials Testing Terms

Extensometer gauge length (Le)

length of the parallel portion of the test piece used for the measurement of extension by means of an extensometer
NOTE It is recommended that for measurement of yield and proof strength parameters Le should span as much of
the parallel length of the test piece as possible. Ideally, as a minimum, Le should be greater than 0,50 L0 but less than
approximately 0,9 Lc. This should ensure that the extensometer detects all yielding events that occur in the test piece. It is
further recommended that for measurement of parameters "at“ or "after“ maximum force, Le is approximately equal to L0.

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