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

18.03.2024

Publication status

E-pub ahead of print

Peer reviewed

Yes

ASJC Scopus subject areas

Materials Science(all), Mechanics of Materials, Mechanical Engineering

Electronic version(s)

https://doi.org/10.1111/ffe.14285 (Access: Closed)