An Improved Split-Ring Method for Measuring the Level of Autofrettage in Thick-Walled Cylinders

[+] Author and Article Information
M. Perl

Perlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel

J. Pressure Vessel Technol 120(1), 69-73 (Feb 01, 1998) (5 pages) doi:10.1115/1.2841887 History: Received September 16, 1996; Revised August 04, 1997; Online February 11, 2008


A simple, yet improved, experimental method for measuring the level of autofrettage in thick-walled cylinders, such as gun barrels, is proposed. A representative ring cut from the barrel serves as the test specimen. The ring is split by cutting it radially, while measuring the released hoop strain at the inner and outer surfaces diametrically opposite from the split line. The opening angle resulting from the spring apart from the ring is also monitored. An analysis based on Hill’s residual stress field yields an approximate relation which readily enables the determination of the prevailing level of autofrettage from strain measurements as well as from the value of the opening angle. This relation is found to be practically universal for all relevant cylinder configurations b/a = 1.6–2.2 and all levels of autofrettage of up to φ = 100 percent.

Copyright © 1998 by The American Society of Mechanical Engineers
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