Crack path and life prediction under mixed mode cyclic variable amplitude loading through XFEM

In the present paper, a mesh independent computational algorithm is developed and incorporated into a commercial finite element software (Abaqus) for automated fatigue crack growth analysis under mixed mode variable amplitude loading conditions. The algorithm calculates the stress intensity factor (...

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Bibliographic Details
Published in:International journal of fatigue 2018-09, Vol.114, p.34-50
Main Authors: Dirik, Haydar, Yalçinkaya, Tuncay
Format: Article
Language:English
Subjects:
Algorithms
Amplitudes
Computation
Computer simulation
Crack propagation
Cracks
Fatigue crack growth life
Fatigue crack growth path
Fatigue failure
Fatigue life
Finite element method
Fracture mechanics
Life prediction
Load
Load history
Materials fatigue
Mathematical analysis
Software
Stress intensity factors
Variable amplitude loading
XFEM
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Summary:In the present paper, a mesh independent computational algorithm is developed and incorporated into a commercial finite element software (Abaqus) for automated fatigue crack growth analysis under mixed mode variable amplitude loading conditions. The algorithm calculates the stress intensity factor (SIF) at predetermined small crack growth increments in the finite element software by using Extended Finite Element Method (XFEM) and predict the fatigue crack growth (FCG) path through local symmetry (KII=0) criterion. The aforementioned algorithm also computes the FCG life by means of cycle-by-cycle integration method through Nasgro equation based on the equivalent SIF range. Load history effects are also taken into account by using appropriate retardation models according to nature of the loading. For verification purpose, experimental crack path trajectories and fatigue life data available in the open literature are compared with computational results. Quite good agreements are obtained between the computed and the experimental results.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2018.04.026