Prediction of stitch crack evolution and gas permeability in multidirectional composite laminates

被引：17
|
作者：
Xu, Jianlong [1 ]
Sankar, Bhavani V. [1 ]
机构：
[1] Univ Florida, Dept Mech & Aerosp Engn, Gainesville, FL 32611 USA
来源：
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2008年 / 39卷 / 10期
关键词：
Laminates; Polymer-matrix composites (PMCs); Finite element analysis (FEA); Permeability;
D O I：
10.1016/j.compositesa.2008.07.003
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Stitch cracks in multidirectional laminates were observed by many researchers in the literature. In the present work, the damage evolution in multidirectional laminates is investigated using the strain energy release rate concept. Two methods are used to compute the strain energy release rate. The effects of ply angle and ply thickness on stitch crack evolution are investigated. Then, a model based on Darcy's law for porous materials is developed for predicting gas permeability in composite laminates containing microcracks and delaminations. Gas permeability is presented as a function of crack density and crack intersection area. Then the intersection areas formed by crack opening displacements are computed using 3D finite element analysis. The progressive gas permeability in multidirectional laminates is predicted and compared with the gas permeability predicted in the cross-ply laminates in our previous work. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1625 / 1631
页数：7
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