Fatigue Life Prediction of Notched Details Using SWT Model and LEFM-Based Approach

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2023-03
Department
Structures – Structural Engineering, Mechanics and Computation
Xi'an Jiaotong University
Department of Civil Engineering
Major/Subject
Mcode
Degree programme
Language
en
Pages
16
Series
Materials, Volume 16, issue 5
Abstract
The fatigue crack initiation life of unwelded steel components accounts for the majority of the total fatigue life, and the accurate prediction of it is of vital importance. In this study, a numerical model utilizing the extended finite element method (XFEM) and Smith–Watson–Topper (SWT) model is established to predict the fatigue crack initiation life of notched details extensively used in orthotropic steel deck bridges. Using the user subroutine UDMGINI in Abaqus, a new algorithm was proposed to calculate the damage parameter of SWT under high-cycle fatigue loads. The virtual crack-closure technique (VCCT) was introduced to monitor crack propagation. Nineteen tests were performed, and the results were used to validate the proposed algorithm and XFEM model. The simulation results show that the proposed XFEM model with UDMGINI and VCCT can reasonably predict the fatigue lives of the notched specimens within the regime of high-cycle fatigue with a load ratio of 0.1. The error for the prediction of fatigue initiation life ranges from −27.5% to 41.1%, and the prediction of total fatigue life has a good agreement with the experimental results with a scatter factor of around 2.
Description
Keywords
fatigue, Xfatigue; XFEM; numerical simulation; fatigue life prediction; UDMGINIFEM, numerical simulation, fatigue life prediction, UDMGINI
Other note
Citation
Hao , R , Wen , Z , Xin , H & Lin , W 2023 , ' Fatigue Life Prediction of Notched Details Using SWT Model and LEFM-Based Approach ' , Materials , vol. 16 , no. 5 , 1942 . https://doi.org/10.3390/ma16051942