Mixed-mode fatigue crack propagation simulation by means of G<sub>eq</sub> and walker models of the structural steel S355

Journal article (2023)

Authors

Haohui Xin Xi’an Jiaotong University
Jielin Liu Xi’an Jiaotong University
J.A.F.O. Correia Xi’an Jiaotong University, Engineering Structures , Universidade do Porto
Filippo Berto Norwegian University of Science and Technology (NTNU), Xi’an Jiaotong University
M. Veljkovic Steel & Composite Structures - CEG
Guian Qian Beijing Institute of Mechanical and Electrical Engineering
Department
Engineering Structures
Copyright: © 2023 Haohui Xin, Jielin Liu, J.A.F.O. Correia, Filippo Berto, M. Veljkovic, Guian Qian
DOI
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https://doi.org/10.1016/j.tafmec.2022.103717
Extended finite element method (XFEM) Equivalent energy release rate () Mixed mode fatigue crack propagation Virtual Crack Closure Technology (VCCT) Walker equation
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Published Date

2023

Language

English

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Department

Engineering Structures

Abstract

In this paper, a numerical simulation method of mixed-mode fatigue crack propagation was explored using the extended finite element method (XFEM) and the Virtual Crack Closure Technique (VCCT). Both 2D and 3D numerical models were selected to simulate the fatigue crack propagation of steel specimens. Two coefficients were proposed to calculate the equivalent energy release rate (Geq) for a better simulation of the mixed-mode fatigue crack propagation of S355 steel. The Walker equation and the calculation formula of Geq were realized by a user-defined subroutine. A set of optimal correction coefficients of mode II energy release rate (GII) and mode III energy release rate (GIII) were quantitatively comparing the simulation results and test data. The results will contribute to fatigue crack propagation prediction of steel structures in the civil engineering field.