Volume 37, Number 4, August 2019
|Page(s)||737 - 743|
|Published online||23 September 2019|
Fatigue Crack Propagation Path and Life Prediction Based on XFEM
Aircraft Design & Research Institute, AVIC Harbin Aircraft Industry Group Co. LTD, Harbin 150000, China
2 Shenyang Entry-Exit Inspection and Quarantine Bureau Technology Center, Shenyang 110011, China
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.
Key words: XFEM / strain energy release rate / crack propagation / fatigue life prediction / fracture mechanics / Abaqus / Paris formula
关键字 : XFEM / 应变能释放率 / 裂纹扩展 / 疲劳寿命预测 / 断裂力学 / Abaqus / Paris公式
© 2019 Journal of Northwestern Polytechnical University. All rights reserved.
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