Low-cycle multiaxial random fatigue life prediction model based on equivalent stress transformation

doi:10.1108/IJSI-07-2022-0095

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	Low-cycle multiaxial random fatigue life prediction model based on equivalent stress transformation
	He, Yingbao; Liu, Jianhui; Hua, Feilong; Zhao, He; Wang, Jie
刊名	International Journal of Structural Integrity
	2022-09-12
卷号	13 期号:5 页码:870-882
关键词	Fatigue testing Stress analysis Titanium alloys Additional strengthening effect Critical plane method Equivalent stress Equivalent stress transformation method Mean stress effects Multiaxial Multiaxial random fatigue Random fatigue Strengthening effect Stress transformation Transformation methods
ISSN号	1757-9864
DOI	10.1108/IJSI-07-2022-0095
英文摘要	Purpose: Under multiaxial random loading, the material stress–strain response is not periodic, which makes it difficult to determine the direction of the critical plane on the material. Meanwhile, existing methods of constant loading cannot be directly applied to multiaxial random loading; this problem can be solved when an equivalent stress transformation method is used. Design/methodology/approach: First, the Liu-Mahadevan critical plane is introduced into multiaxial random fatigue, which is enabled to determine the material's critical plane position under random loading. Then, an equivalent stress transformation method is proposed which can convert random load to constant load. Meanwhile, the ratio of mean stress to yield strength is defined as the new mean stress influence factor, and a new non-proportional additional strengthening factor is proposed by considering the effect of phase differences. Findings: The proposed model is validated using multiaxial random fatigue test data of TC4 titanium alloy specimens and the results of the proposed model are compared with that based on Miner's rule and BSW model, showing that the proposed method is more accurate. Originality/value: In this work, a new multiaxial random fatigue life prediction model is proposed based on equivalent stress transformation method, which considers the mean stress effect and the additional strengthening effect. Results show that the predicted fatigue lives given by the proposed model are in well accordance with the tested data. © 2022, Emerald Publishing Limited.
WOS研究方向	Engineering
语种	英语
出版者	Emerald Publishing
WOS记录号	WOS:000847526100001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/159742]
专题	机电工程学院
作者单位	School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou, China
推荐引用方式 GB/T 7714	He, Yingbao,Liu, Jianhui,Hua, Feilong,et al. Low-cycle multiaxial random fatigue life prediction model based on equivalent stress transformation[J]. International Journal of Structural Integrity,2022,13(5):870-882.
APA	He, Yingbao,Liu, Jianhui,Hua, Feilong,Zhao, He,&Wang, Jie.(2022).Low-cycle multiaxial random fatigue life prediction model based on equivalent stress transformation.International Journal of Structural Integrity,13(5),870-882.
MLA	He, Yingbao,et al."Low-cycle multiaxial random fatigue life prediction model based on equivalent stress transformation".International Journal of Structural Integrity 13.5(2022):870-882.