期刊
ENGINEERING STRUCTURES
卷 227, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2020.111414
关键词
Fatigue crack propagation; Phantom nodes-based extended finite element method; Virtual Crack Closure Technique; Mean stress effects
资金
- National Natural Science Foundation of the People's Republic of China [51808398, 52078362]
- CONSTRUCT -Instituto de I&D em Estruturas e Construcoes - national funds through the FCT/MCTES (PIDDAC) [UIDB/04708/2020, UIDP/04708/2020]
- project grant (FiberBridge Fatigue strengthening and assessment of railway metallic bridges using fiber-reinforced polymers) by FEDER funds through COMPETE2020 (POCI) [POCI-01-0145-FEDER-030103]
- national funds (PIDDAC) through the Portuguese Science Foundation (FCT/MCTES)
The assessment of fatigue crack propagation in steel structures is crucial for improving the application of high strength steel in construction. The study used the Walker equation to fit the fatigue crack propagation rate of steel grades S355 and S690, and developed a three-dimensional simulation subroutine which was successfully validated for both grades.
The assessment of fatigue crack propagation of steel structures is essential and important especially to improve the application of high strength steel in construction. The load ratio R, reflecting mean stress effects, will be changed with crack extension in the steel structures with complicated geometry. In this paper, the Walker equation is employed to fit the fatigue crack propagation rate of steel grades S355 and S690 based on experimental data in the literature to incorporate the mean stress effects. The material fatigue crack propagation parameters with 95%, 97.7%, and 99% guarantee of Walker equation were obtained by a stochastic analysis using the Monte Carlo method. The fatigue life was firstly predicted by the analytical method and was used as a baseline for numerical fatigue crack propagation simulation. A user-defined fatigue crack propagation subroutine based on the Walker equation was developed using phantom nodes-based extended finite element method (PN-XFEM) and Virtual Crack Closure Technique (VCCT) to consider the mean stress effects. The proposed three-dimensional fatigue crack propagation simulation subroutine is successfully validated of both steel grades, S355 and S690.
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