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Effects of Mean Stress and Multiaxial Loading on Fatigue Life of Springs
Version 1
: Received: 26 April 2023 / Approved: 28 April 2023 / Online: 28 April 2023 (11:11:04 CEST)
A peer-reviewed article of this Preprint also exists.
Kobelev, V. Effects of Mean Stress and Multiaxial Loading on the Fatigue Life of Springs. Eng 2023, 4, 1684-1697. Kobelev, V. Effects of Mean Stress and Multiaxial Loading on the Fatigue Life of Springs. Eng 2023, 4, 1684-1697.
Abstract
In this paper, we investigate the effects of mean stress, multiaxial loading, and residual stresses on the fatigue life of springs. We study the fatigue life of a homogeneously stressed material subjected to cyclic loading with nonzero mean stress. Traditional methods for estimating fatigue life are based on Goodman and HAIGH diagrams. The formal analytical descriptions, namely "stress-life" and "strain-life" approaches, are found to be more suitable for the numerical methods. The fatigue analysis method described above, which describes crack growth per cycle, is extended. The extensions allow consideration of the mean stress of a load cycle. Closed-form expressions for crack length versus number of cycles are derived. The complementary effects on the fatigue life of springs, which ultimately have a significant influence on the fatigue life of springs, are summarized. For the proposed unified fatigue life functions, the ranges for the stress loading factor are extended by introducing the effective stress intensity. The solution leads to the factor range for the effective stress intensity, the effective mean value of the stress intensity factor and the effective stress ratio. The developed method assumes the homogeneous stress state in the whole spring element. For the non-homogeneously loaded structural elements, the weak-link concept is applied to account for fatigue.
Keywords
fatigue life of springs; SMITH-WATSON-TOPPER approach; WALKER approach; BERGMANN approach; Accumulation of damage; sequence effects in fatigue
Subject
Engineering, Mechanical Engineering
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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