Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 31, Issue 3, Pages 501-507Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2008.04.008
Keywords
Ratcheting strain; Mean stress effect; S-N curve; Modified Goodman equation; Smith-Watson-Topper parameter; Walker parameter
Funding
- National Research Foundation of Korea [과C6A1807] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Stress-control fatigue tests have been conducted on a copper alloy at room temperature with and without mean stress. Ratcheting strain was measured to failure under four sets of stress amplitude and mean stress. The ratcheting strain versus cycle curve is similar to the conventional creep curve under static load consisting of primary, steady-state and tertiary stages. The steady-state rate and ratcheting strain at failure increase with mean stress for a given stress amplitude and with stress amplitude for a given mean stress. Ratcheting strain increases as the stress rate decreases. The S-N curve approach and mean stress models of Smith-Watson-Topper and Walker yielded good correlation of fatigue lives in the life range of 10(2)-10(5) cycles. (C) 2008 Elsevier Ltd. All rights reserved.
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