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How extensometer sensing the initial strain or at 0.2% strain

Author:
Sivakumar
Date added:
Tuesday, 20 January 2009
Last revised:
Monday, 23 February 2009
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Answer

An extensometer is used to measure the strain in the actual test piece rather than machine movement. As previously mentioned, this is more accurate than measureing machine/crosshead movement. Exctensometers are usually attached to the test piece but optical, non-contacting versions are also available.
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