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A study was conducted to compare two methods of determining the total percent elongation from standard tension tests. For each test, total percent elongation was measured by two methods: the conventional manually “measured” method where the broken specimen halves are fitted back together after the test, and the automated “extensometer” method where elongation to fracture is determined by an extensometer that is left on the specimen up to the moment of fracture.
Comparison of “measured” and “extensometer” elongation results reveals excellent agreement between the two methods. The difference between the two elongation values is generally less than 1% elongation, with the measured value normally being higher.
A model was developed that could be used to predict the “measured” elongation from the “extensometer” elongation to within 1% to 1.5% of the actual “measured” value.
uniaxial tension tests, mechanical properties, total percent elongation, automated tension tests, variability
Engineer, Research and Technology, Armco, Inc., Middletown, OH