Multiaxial fatigue life prediction using an improved Smith-Watson-Topper model

authored by: Jing Li, Feng shan Shao, Zheng wei He, Juan Ma, Yuan ying Qiu, Michael Beer
Abstract: In this paper, the SWT model was improved by incorporating the Walker equation into the strain–life curve. The established model takes into account the material's sensitivity to mean stress by introducing the Walker exponent, w. Under uniaxial loading condition, the proposed model can reduce to the SWT model, Manson-Coffin equation, and Walker model for w values of 0.5, 1, and 0, respectively. Under multiaxial symmetric loading, when w = 0.5, the proposed model can be simplified as another SWT correction model (CXH) proposed by Chen et al. The prediction accuracy of the established model was validated using about 200 data points collected from literature. These data points were obtained from tests conducted on eight different kinds of metals under various multiaxial loading paths. The verification results indicate that 96.8% and 97.9% of the data points fall within the factor-of-three boundary for the loading paths without and with mean stresses, respectively.
Organisation(s): Institute for Risk and Reliability
External Organisation(s): Xidian University
Type: Article
Journal: Fatigue and Fracture of Engineering Materials and Structures
Volume: 47
Pages: 1944-1961
No. of pages: 18
ISSN: 8756-758X
Publication date: 02.05.2024
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Materials Science, Mechanics of Materials, Mechanical Engineering
Electronic version(s): https://doi.org/10.1111/ffe.14285 (Access: Closed)

BibTeX

@article{85317c226e2f4931954cab8c940a7f34,
title = "Multiaxial fatigue life prediction using an improved Smith-Watson-Topper model",
abstract = "In this paper, the SWT model was improved by incorporating the Walker equation into the strain–life curve. The established model takes into account the material's sensitivity to mean stress by introducing the Walker exponent, w. Under uniaxial loading condition, the proposed model can reduce to the SWT model, Manson-Coffin equation, and Walker model for w values of 0.5, 1, and 0, respectively. Under multiaxial symmetric loading, when w = 0.5, the proposed model can be simplified as another SWT correction model (CXH) proposed by Chen et al. The prediction accuracy of the established model was validated using about 200 data points collected from literature. These data points were obtained from tests conducted on eight different kinds of metals under various multiaxial loading paths. The verification results indicate that 96.8% and 97.9% of the data points fall within the factor-of-three boundary for the loading paths without and with mean stresses, respectively.",
keywords = "fatigue life prediction, multiaxial cyclic loading, strain energy density, SWT model, Walker exponent",
author = "Jing Li and Shao, {Feng shan} and He, {Zheng wei} and Juan Ma and Qiu, {Yuan ying} and Michael Beer",
note = "Publisher Copyright: {\textcopyright} 2024 John Wiley & Sons Ltd.",
year = "2024",
month = may,
day = "2",
doi = "10.1111/ffe.14285",
language = "English",
volume = "47",
pages = "1944--1961",
journal = "Fatigue and Fracture of Engineering Materials and Structures",
issn = "8756-758X",
publisher = "Wiley-Blackwell Publishing Ltd",
number = "6",
}