Fatigue crack initiation prediction using phantom nodes-based extended finite element method for S355 and S690 steel grades

•Phantom nodes-based extended finite element method to predict fatigue crack initiation.•A user-defined fatigue damage initiation subroutine based on Smith, Watson, and Topper (SWT) damage model combined with non-linear isotropic/kinematic cyclic hardening model is implemented.•The SWT damage model...

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Bibliographic Details
Published in:Engineering fracture mechanics 2019-06, Vol.214, p.164-176
Main Authors: Xin, Haohui, Veljkovic, Milan
Format: Article
Language:English
Subjects:
Crack initiation
Crack propagation
Damage
Damage assessment
Extended finite element method (XFEM)
Fatigue crack initiation
Fatigue failure
Fatigue life prediction
Fatigue tests
Finite element analysis
Finite element method
Fracture mechanics
High strength steels
Mathematical analysis
Metal fatigue
Nodes
Nonlinear programming
Phantom nodes
Smith, Watson and Topper damage model
Steel construction
Steel structures
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Summary:•Phantom nodes-based extended finite element method to predict fatigue crack initiation.•A user-defined fatigue damage initiation subroutine based on Smith, Watson, and Topper (SWT) damage model combined with non-linear isotropic/kinematic cyclic hardening model is implemented.•The SWT damage model is validated to predict fatigue crack of steel S355 and S690. The assessment of fatigue crack initiation behavior of steel structures is essential and important especially to improve the application of high strength steel in construction. For a complete understanding of fatigue endurance, it is necessary to combine the phenomenological damage model with finite element numerical approach. In this paper, phantom nodes-based extended finite element method is used to predict the fatigue crack initiation of steel material, considering a prediction by XFEM of coupon tests made of steel grades S355 and S690. A user-defined fatigue damage initiation subroutine based on Smith, Watson, and Topper (SWT) damage model combined with non-linear isotropic/kinematic cyclic hardening model is implemented to predict fatigue crack initiation. The proposed method is successfully validated based on fatigue coupon test results of both steel grades, S355 and S690.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2019.04.026