Probabilistic fatigue framework of notched specimens based on modified strain energy density model under multiaxial loadings

doi:10.1016/j.engfracmech.2022.108401

CORC > 兰州理工大学 > 兰州理工大学 > 机电工程学院

	Probabilistic fatigue framework of notched specimens based on modified strain energy density model under multiaxial loadings
	Ran, Yong; Liu, Jianhui; Wei, Yaobing
刊名	Engineering Fracture Mechanics
	2022-05-01
卷号	266
关键词	Fatigue of materials Hardening Strain energy Stress concentration Welds Density modeling Energy-based models Modified strain energy density Multi-axial loadings Non-proportional hardening Notch effect and size effect Notched specimens Probabilistic fatigue Sizes effect Strain energy density
ISSN号	0013-7944
DOI	10.1016/j.engfracmech.2022.108401
英文摘要	Notch features often raise critical effects on fatigue lives of engineering components, which deserve particular attention for assessing their structural integrity and reliability. In this study, through modifying the strain energy density model, a probabilistic framework for assessing the fatigue life of notched specimens is established under multiaxial loadings. Firstly, the strain energy density is calculated by the finite element method on an arbitrarily material plane is investigated. Secondly, a modified energy-based model is proposed by incorporating the notch effect and size effect, the non-proportional hardening and the stress concentration factors. Finally, combining the modified strain energy density model with the Weibull distribution as well as the theory of critical distance, a new probabilistic fatigue framework is developed to estimate the fatigue life of notched specimens under different survival probabilities. Experimental data of TC4 alloy, Al7050-T7451, GH4196 alloy and medium steel En8 notched specimens are employed to validate the proposed model and other six energy-based models (MSWT model, CXH model, CCB model, VF model, Liu model). The comparison results exhibit that the proposed model yields a higher accuracy than six other models within the ±2 life factor. Meanwhile, novel Pf-W-Nf curves of multiaxial notched specimens with different survival probabilities are presented and analyzed. © 2022 Elsevier Ltd
WOS研究方向	Mechanics
语种	英语
出版者	Elsevier Ltd
WOS记录号	WOS:000788103300001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/157964]
专题	机电工程学院兰州理工大学
作者单位	School of Mechanical & Electronical Engineering, Lanzhou University of Technology, Gansu, Lanzhou, China
推荐引用方式 GB/T 7714	Ran, Yong,Liu, Jianhui,Wei, Yaobing. Probabilistic fatigue framework of notched specimens based on modified strain energy density model under multiaxial loadings[J]. Engineering Fracture Mechanics,2022,266.
APA	Ran, Yong,Liu, Jianhui,&Wei, Yaobing.(2022).Probabilistic fatigue framework of notched specimens based on modified strain energy density model under multiaxial loadings.Engineering Fracture Mechanics,266.
MLA	Ran, Yong,et al."Probabilistic fatigue framework of notched specimens based on modified strain energy density model under multiaxial loadings".Engineering Fracture Mechanics 266(2022).