期刊
COMPOSITE STRUCTURES
卷 128, 期 -, 页码 381-394出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2015.03.066
关键词
3D braided composites; Impact compression; Finite element (FE); Multi-scale structure
资金
- National Science Foundation of China [11272087]
- Foundation for the Author of National Excellent Doctoral Dissertation of PR China (FANEDD) [201056]
- Shanghai Rising-Star Program [11QH1400100]
- Fundamental Research Funds for the Central Universities of China
This paper presents a comprehensive study aimed at the compressive properties of three-dimensional (3D) braided composites subjected to quasi-static and high strain rate loadings using finite element method from fiber/matrix scale to composite scale. It focuses on a computationally efficient multi-scale methodology for prediction of the effective elastic properties and the failure strength of 3D braided composites. First, finite element models with strain rate sensitive elasto-plastic constitutive relationship and ductile and shear failure criterion were established to investigate the mechanical properties and failure mechanism. Second, the failure mechanism in micro-scale fiber/matrix was investigated. The mechanical properties of the interior unit cell, surface unit cell and corner unit cell were predicted and compared, which shows that the surface and corner region of braided preform play an important role during both quasi-static and high strain rate loading. The results obtained from the whole structure heterogeneous composite model and the homogeneous composite model were also analyzed and compared. Finally, the numerical results were verified by the experimental data and the results are encouraging. This method can provide an important guidance for evaluating the mechanical properties and selecting structural parameters for braided composites. (C) 2015 Elsevier Ltd. All rights reserved.
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