期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 107, 期 -, 页码 633-646出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2018.02.008
关键词
Laminates; Fatigue; Cohesive interface modelling; Finite element analysis (FEA)
资金
- China Scholarship Council (CSC)
This work presents a cohesive interface model for predicting interlaminar failure of composite laminates under tension-tension fatigue loading. The model features improvements on previous formulations and utilizes four integration-point elements, which offer several new advantages, while maintaining the merits of the previous single-integration-point elements. An element-based crack tip tracking algorithm is incorporated to confine fatigue damage to crack-tip elements only. A new local rate approach is proposed to ensure accurate integration of strain energy release rate from local elements. Furthermore, a dynamic fatigue characteristic length is proposed to offer a more accurate estimation of fatigue characteristic length in complex three-dimensional cases. Fatigue initiation is incorporated by using a strength reduction method, without changing the propagation characteristics. The numerical approach has been verified and validated using multiple cases and was then applied to fatigue damage development in open-hole laminates, where a good agreement between numerical analysis and experimental results was obtained.
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