Home Ask the Expert David answers your questions Hi sir, How much the % of variation of 0.2% proof stress, when using with extensometer and without extensometer (by autographic methd), is it within 1

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Hi sir, How much the % of variation of 0.2% proof stress, when using with extensometer and without extensometer (by autographic methd), is it within 1

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Sivakumar
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Monday, 23 February 2009
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Answer

Some calculations eg Young's Modulus and Proof Stress can only be determined accurately using an extensometer. If you attempt to measure using crosshead movement as your strain axis, the accuracy of the measurement will be much worse than 1%
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