Cut-edge effect of three-dimensional full five-directional braided composites

被引：0
|
作者：
Liu Z. [1 ]
Huang X. [1 ]
Ya J. [1 ]
Lei B. [1 ]
Li X. [1 ]
Cheng X. [2 ]
机构：
[1] School of Aeronautic Science and Engineering, Beihang University, Beijing
[2] Xi'an Aerospace Composites Research Institute, Xi'an
来源：
Liu, Zhenguo (liuzg@buaa.edu.cn) | 1600年 / Chinese Society of Astronautics卷 / 38期
关键词：
3DF5D; Braiding angle; Cut-edge effect; Experimental study; Mechanical property;
D O I：
10.7527/S1000-6893.2017.220885
中图分类号：
学科分类号：
摘要：
Experimental research on cut-edge and uncut-edge effects of the mechanical performance of three-Dimensional Full five-Directional (3DF5D) braided composites is conducted. The specimens include two different braiding angles and three different cutting ways (uncut-edge, cut along the thickness direction and cut along the width direction). The mechanical performances of the specimens are obtained and studied to get the conclusion of the cut-edge influence. It is found that for the specimen cut along the thickness direction, there is approximately 10% reduction in average stiffness and 25% reduction in average strength, compared with specimens without cut-edge; while for the specimen cut along the width direction, the stiffness and strength decrease by 3% and 18%, respectively. The progressive damage and failure process of mesoscopic braided structures are investigated based on the repeated unit cells, and then the stress-strain curve of the specimen is obtained. Good agreement is obtained between the numerical and experimental results. Results show that the tensile stiffness and strength decrease with the increase of the braiding angle. The cut-edge effect on the performance of full 5-directional braided composites performance weakens and comes close to a constant with the increase of inner cells. © 2017, Press of Chinese Journal of Aeronautics. All right reserved.
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