期刊
THIN-WALLED STRUCTURES
卷 119, 期 -, 页码 531-543出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.tws.2017.07.004
关键词
Damage model; Composite; Waved beam; Crashworthiness; Trigger geometry
资金
- National Natural Science Foundation of China [11402011]
- Fundamental Research Funds for the Central Universities [201401390741]
A nonlinear progressive damage model is proposed to predict the failure response of composite waved beam subjected to quasi-static axial crushing. To predict the failure model, both of the intra-laminar failure and de lamination are considered. Based on continuum damage mechanics(CDM), the in-plane damage initiation is modeled with the maximum-stress failure criterion. To simulate the failed material, a stiffness degradation method combined with exponential damage evolution laws is adopted. A fracture-energy approach in conjunction with the characteristic element length is chosen to predict the damage evolution. The delamination initiation is given by a quadratic nominal-stress criterion. Considering the progressive delamination failure process, a cohesive stiffness degradation method and an exponential softening law based on a mix-mode fracture criterion are presented to predict the delamination propagation. To achieve better crashworthiness of composite waved beam, the wedge-trigger, two types of W-triggers and bevel-triggers with hybrid angles are proposed. Additionally, effect of the angle of chamfer-trigger on crashworthiness is investigated. Numerical results show that predictions correlate well with experimental results. Moreover, the present damage model can accurately capture intra-laminar and inter-laminar failure mechanisms. The proposed bevel-triggers perform significant effect in decreasing the peak load, and angles of chamfer-trigger make little difference in the crashworthiness.
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