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RESEARCH PAPERS: Reliability, Stress Analysis, and Failure Prevention

Safety Factor in Fatigue Under Fluctuating Stresses

[+] Author and Article Information
V. A. Avakov

Mechanical Engineering Dept., University of Alabama, Tuscaloosa, AL 35487

J. Vib., Acoust., Stress, and Reliab 109(4), 397-401 (Oct 01, 1987) (5 pages) doi:10.1115/1.3269459 History: Received June 08, 1987; Online November 23, 2009

Abstract

It is common to assume identical allowable safety factors in static strength [m ], defined by mean stress (S m ), and in fatigue [a ], defined by stress amplitude (S a ), in order to find the full safety factor (F ) under asymmetrical cycles, or to plot any type of the S m –S a diagram of allowable stresses. Here additional modification is considered to generalize expression of the full factor of safety in fatigue under asymmetrical stresses, utilizing unequal allowable safety factors in static strength (by mean stress) and in fatigue (by stress amplitude): ([a ] ≠ [m ]). We assume that loading is stationary, and cumulated number of cycles is large enough to consider high cycle fatigue.

Copyright © 1987 by ASME
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