SYMPOSIA PAPER Published: 01 January 1993

A Comparison of Automated Versus Manual Measurement of Total Elongation-Tension Testing


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.

Author Information

Scherrer, DK
Research and Technology, Armco, Inc., Middletown, OH
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Developed by Committee: E28
Pages: 65–74
DOI: 10.1520/STP19266S
ISBN-EB: 978-0-8031-5253-3
ISBN-13: 978-0-8031-1868-3