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Critical plane-based fatigue life model under multiaxial random loading

Jie Wang (School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou, China)
Jianhui Liu (School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou, China)
Feilon Hua (School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou, China)
Yingbao He (School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou, China)
Xuexue Wang (School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou, China)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 8 August 2022

Issue publication date: 12 September 2022

142

Abstract

Purpose

Engineering components/structures are usually subjected to complex and variable loads, which result in random multiaxial stress/strain states. However, fatigue analysis methods under constant loads cannot be directly applied to fatigue life prediction analysis under random loads. Therefore, the purpose of this study is how to effectively evaluate fatigue life under multiaxial random loading.

Design/methodology/approach

First, the average phase difference is characterized as the ratio of the number of shear strain cycles to the number of normal strain cycles, and the new non-proportional additional hardening factor is proposed. Then, the determined random typical load spectrum is processed into a simple variable amplitude load spectrum, and the damage in each plane is calculated according to the multiaxial fatigue life prediction model and Miner theory. Meanwhile, the cumulative damage can be calculated separately by projection method. Finally, the maximum projected cumulative damage plane is defined as the critical plane of multiaxial random fatigue.

Findings

The fatigue life prediction capability of the method is verified based on test data of TC4 titanium alloy under random multiaxial loading. Most of the predicting results are within double scatter bands.

Originality/value

The objective of this study is to provide a reference for the determination of critical plane and non-proportional additional hardening factor under multiaxial random loading, and to promote the development of multiaxial fatigue from experimental studies to practical engineering applications.

Keywords

Acknowledgements

Lanzhou Talents Innovation and entrepreneurship Project [2021-RC-23] and Hongliu Youth Fund of Lanzhou University of Technology.

Citation

Wang, J., Liu, J., Hua, F., He, Y. and Wang, X. (2022), "Critical plane-based fatigue life model under multiaxial random loading", International Journal of Structural Integrity, Vol. 13 No. 5, pp. 845-856. https://doi.org/10.1108/IJSI-06-2022-0083

Publisher

:

Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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