Impact shear damage characterizations of 3D braided composite with Xray micro-computed tomography and numerical methodologies

被引:55
|
作者
Li, Yuanyuan [1 ]
Sun, Baozhong [1 ]
Gu, Bohong [1 ]
机构
[1] Donghua Univ, Coll Text, Shanghai 201620, Peoples R China
基金
美国国家科学基金会;
关键词
3-D braided composites; Impact behaviour; Finite element analysis (FEA); CT (computed tomography) analysis; REINFORCED COMPOSITES; EVOLUTION; MECHANISMS; 2D;
D O I
10.1016/j.compstruct.2017.04.067
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
This paper presents the impact shear fracture mechanisms of 3D braided composite observed from computed tomography (CT) and the comparisons with finite element analyses (FEA). The effects of braiding parameters on the damage modes have been analyzed from micro-CT and FEA. It revealed that there are multiple damage modes of fiber tows fracture, debonding, resin cracks and inter-yarn delaminations under impact shear loading. The failure mode mainly depends on the braiding structural parameters, which in return determines the energy absorption capacity. A meso-structure geometrical model based on braided preform structure was developed to calculate the stress distribution and to simulate the shear damage modes. The failure modes from FEA were compared with those obtained from the micro-CT. Both the micro-CT and FEA observations capture the impact shear damage morphologies and unveil the energy absorption mechanisms. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:43 / 54
页数:12
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