纺织学报 ›› 2020, Vol. 41 ›› Issue (05): 79-84.doi: 10.13475/j.fzxb.20190507806

• 纺织工程 • 上一篇    下一篇

开孔三维编织复合材料的压缩性能

梁双强1, 陈革1,2(), 周其洪1   

  1. 1.东华大学 机械工程学院, 上海 201620
    2.新疆大学 纺织与服装学院, 新疆 乌鲁木齐 830000
  • 收稿日期:2019-05-29 修回日期:2020-02-15 出版日期:2020-05-15 发布日期:2020-06-02
  • 通讯作者: 陈革
  • 作者简介:梁双强(1991—),男,博士生。主要研究方向为纺织复合材料。

Compression property of notched 3-D braided composites

LIANG Shuangqiang1, CHEN Ge1,2(), ZHOU Qihong1   

  1. 1. College of Mechanical Engineering, Donghua University, Shanghai 201620, China
    2. College of Textile and Clothing, Xinjiang University, Urumqi, Xinjiang 830000, China
  • Received:2019-05-29 Revised:2020-02-15 Online:2020-05-15 Published:2020-06-02
  • Contact: CHEN Ge

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摘要：

为研究机械开孔对三维编织复合材料压缩性能的影响,测试了2种三维编织复合材料试验件的压缩性能。1种为基本编织(100%编织纱)结构,另1种为含有编织纱/轴向纱(58/42)的结构,试验件编织角约为±12°。根据相关标准要求,分别进行有开孔和无开孔的复合材料试验件准静态压缩试验,并与层合板的压缩性能进行对比。研究结果表明:2种三维编织结构无缺陷材料的压缩强度较为接近,但引入开孔后,无增强纱结构可保留更高比列的压缩强度;引入开孔后,2种三维编织复合材料保留的压缩强度均高于层合板;在失效形式上,2种三维编织复合材料的宏观失效形式较为相似,均为剪切失效,表现出横向断裂且无分层现象。

关键词: 三维编织复合材料, 开孔缺陷, 压缩强度, 轴向纱

Abstract:

In order to study the open-hole notch effect on compression properties of three dimensional (3-D) braided composites, two types of 3-D braided specimens with ±12° braiding angles were fabricated and tested. One was a purely braided structure, and the other was made by incorporating 58% braiding yarns and 42% longitudinal lay-in yarns. According to relevant standards, quasi-static compression tests of composite specimens with and without notch were carried out respectively, and the results of which were compared with that of laminates. The results show that the compression strength of the two types of 3-D braided composites is very similar, but the pure 3-D braided structure with open holes can retain higher proportion of compression strength. Compared with laminated composites, both types of 3-D braided composites retain to show a higher proportion of compression strength. With regard to the failure behavior under compression loading, the two types of 3-D braided composites are also similar, the specimens fail in shear, showing transverse fracture without delamination.

Key words: 3-D braided composite, open-hole notch, compression strength, axial yarn

中图分类号: 

  • TB332

表1

纤维和基体材料性能参数"

材料 弹性模量/GPa 拉伸强度/MPa 应变/%
基体 2.74 51 3.6
AS4-6 K碳纤维 231 4 447 1.7

图1

试验件尺寸和几何形状"

图2

三维编织复合材料截面图"

图3

开孔试验件支撑夹具"

图4

IITRI试验装置"

图5

无缺陷试验件准静态下压缩载荷-位移曲线"

图6

含开孔试验件准静态下压缩载荷-位移曲线"

表2

各组试验件压缩性能数据"

试验件 试验件
编号		 横截面积/
mm2		 纤维
体积比/
%		 失效载荷/
kN		 强度/
MPa
开孔
试验件		 Style I-22 74.7 59 25.4 340.50
Style I-23 74.6 59 28.8 385.70
Style I-24 74.8 59 29.7 396.80
Style I-25 71.2 59 24.8 348.20
Style II-8 75.4 62 31.3 415.19
Style II-9 75.5 62 28.0 371.00
Style II-10 76.6 62 33.0 431.70
无开
孔试
验件		 Style I-01 71.8 59 36.9 513
Style I-12 72.8 59 48.3 663
Style I-13 72.3 59 42.3 585
Style I-17 71.8 59 42.6 593
Style II-04 71.8 62 40.1 558
Style II-05 72.2 62 43.9 608
Style II-06 72.5 62 45.0 621

表3

压缩性能数据对比"

试验件 无开孔
强度/MPa		 含开孔
强度/MPa		 模量/
GPa		 无缺陷失效
应变/%		 强度
保留/%
Style I 589 368 54.75 1.09 62.5
Style II 596 406 49.00 1.20 68.0

图7

2种三维编织复合材料与层合板压缩性能对比"

图8

无开孔压缩失效形式"

图9

含缺陷压缩失效形式"

图10

开孔试验件断裂裂纹"

图11

复合材料试验件断裂截面"

图12

Style II无缺陷试验件断裂面电镜照片"

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