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RESEARCH PAPERS

Investigation of the Relaxation of Residual Stresses in Autofrettaged Cylinders

[+] Author and Article Information
Victor C. D. Dawson

Hydroballistics and Mechanics Division, U. S. Naval Ordnance Laboratory, White Oak, Silver Spring, Md.

J. W. Jackson

Mechanical Engineering, University of Maryland, College Park, Md.

J. Basic Eng 91(1), 63-66 (Mar 01, 1969) (4 pages) doi:10.1115/1.3571029 History: Received July 24, 1968; Online November 03, 2011

Abstract

Autofrettaged cylinders have been restricted in their use to relatively low temperatures because of the stress relieving effect of high temperatures. Thus, it was felt that high-temperature operation would alter the stress pattern to such an extent that the auto-frettage process would be of little benefit. This study was conducted to determine what the effects of time and temperature would be on the residual stresses. Small-size autofrettaged cylinders were subjected to temperatures varying from 400 to 850 F for times varying from 1 hr to 72 hr. The residual stresses were determined using a modification of the Sachs’ boring-out technique. The results indicated a stress relief in all the cylinders subjected to high temperatures. However, it was found that for a given temperature and time the bore tangential stress relaxes in a manner that can be predicted by means of creep data. This relation appears to have a limiting value related to the creep-resistant characteristics of the material.

Copyright © 1969 by ASME
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