Analysis of Misalignment in the Tension Test

[+] Author and Article Information
Han C. Wu

Division of Materials Engineering, University of Iowa, Iowa City, Iowa 52242

D. R. Rummler

Materials Division, NASA - Langley Research Center, Hampton, Va. 23665

J. Eng. Mater. Technol 101(1), 68-74 (Jan 01, 1979) (7 pages) doi:10.1115/1.3443653 History: Received April 13, 1978; Online August 17, 2010


Many experimenters fail to appreciate the significance of test system alignment during a tensile test. Poor alignment can increase data scatter and significantly influence some of the test results. In this paper a comprehensive analytical study of the misalignment problem in the plastic strain range is presented and errors caused by misalignment estimated. The results show that the stress-strain curve is not significantly affected by misalignment. However, the strains at the outer most fibers of the specimen cross-section are stongly affected by misalignment. Therefore, the effect of misalignment is most important when properties sensitive to local strain concentrations are being investigated.

Copyright © 1979 by ASME
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