Measurement of the Elastic-Plastic Boundary Around Coldworked Fastener Holes

[+] Author and Article Information
S. Poolsuk

Royal Thai Air Force Academy, Bangkok, Thailand

W. N. Sharpe

Department of Metallurgy, Mechanics, and Materials Science, Michigan State University, East Lansing, Mich. 048824

J. Appl. Mech 45(3), 515-520 (Sep 01, 1978) (6 pages) doi:10.1115/1.3424354 History: Received October 01, 1977; Revised December 01, 1977; Online July 12, 2010


Coldworking the material near the edge of a fastener hole is one important means of increasing fatigue life. The stresses, strains, and location of the boundary between elastic and plastic regions have been analyzed by various theoretical studies. The purpose of this research is to experimentally evaluate the theories’ capabilities of predicting the boundary location. Specimens of 7075-T6 aluminum 6.35 mm and 3.18 mm thick with a 6.60 mm hole were coldworked various amounts by an industrial process. The elastic-plastic boundary was located by foil gage and thickness change measurements; both techniques gave similar results. Theories based on plane stress agreed well for the thinner specimens.

Copyright © 1978 by ASME
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