Cycle-Dependent Stress Relaxation of A-286 Alloy

[+] Author and Article Information
A. S. Ross

Boeing Airplane Company, Renton, Wash.

JoDean Morrow

University of Illinois, Urbana, Ill.

J. Basic Eng 82(3), 654-658 (Sep 01, 1960) (5 pages) doi:10.1115/1.3662690 History: Received August 13, 1959; Online November 04, 2011


When an axial fatigue specimen is subjected to repeated strain cycling about a fixed mean strain value, the mean stress decreases with the number of strain cycles. To explore this type of material behavior, tubular fatigue specimens of A-286 alloy have been axially tested under conditions of controlled strain, and the cycle-dependent relaxation of mean stress measured. Fatigue data for five initial mean stresses are also reported. It was found that, in the case of A-286 alloy, most of the relaxation occurred early in the fatigue life, especially during the first ten cycles.

Copyright © 1960 by ASME
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