1. Fatigue Crack Propagation Path and Life Prediction Based on XFEM
- Author
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Longlong He, Kunfa Men, Jinliang Wang, Zhifang Liu, and Junjie Gu
- Subjects
Materials science ,abaqus ,crack propagation ,02 engineering and technology ,01 natural sciences ,0203 mechanical engineering ,xfem ,0101 mathematics ,Extended finite element method ,strain energy release rate ,Motor vehicles. Aeronautics. Astronautics ,Strain energy release rate ,business.industry ,General Engineering ,Fracture mechanics ,TL1-4050 ,Structural engineering ,Paris' law ,fatigue life prediction ,010101 applied mathematics ,020303 mechanical engineering & transports ,Amplitude ,paris formula ,fracture mechanics ,Path (graph theory) ,Constant (mathematics) ,business ,Damage tolerance - Abstract
Based on the theory of linear elastic fracture mechanics, the relationships between material constants c3, c4 required in Abaqus and constants C, m in Paris formula are derived. Then extended finite element method (XFEM) of Abaqus software is used to is used to predict the crack propagation path and life of the plate with center inclined through crack and typical stiffened wing spar with initial crack under the constant amplitude fatigue load. The results show that the predicted crack propagation path is in good agreement with the experimental results, and the crack propagation life error is less than 6.3%. It also shows that this method can accurately predict the fatigue crack growth path and life of two-dimensional and three-dimensional complex structures under constant amplitude loads. This study can provide an effective way for damage tolerance analysis of structures and has certain engineering application value.
- Published
- 2019