纺织学报 ›› 2019, Vol. 40 ›› Issue (12): 162-168.doi: 10.13475/j.fzxb.20190806707

• 纺织科技新见解学术沙龙专栏:碳纤维及其复合材料制备技术及应用 • 上一篇    下一篇

含变异结构的三维机织复合材料的轴向拉伸性能

刘俊岭1,2, 孙颖1,2, 陈利1,2()   

  1. 1.天津工业大学 先进纺织复合材料天津市和教育部共建重点实验室, 天津 300387
    2.天津工业大学 纺织科学与工程学院, 天津 300387
  • 收稿日期:2019-08-26 修回日期:2019-09-15 出版日期:2019-12-15 发布日期:2019-12-18
  • 通讯作者: 陈利
  • 作者简介:刘俊岭(1990—),男,博士生。主要研究方向为复合材料结构设计与液体模塑成型工艺的数值模拟。
  • 基金资助:
    天津市科技重大专项与工程项目(18ZXJMTG00190);山西省科技重大专项项目(20181102022);天津市高等学校创新团队培养计划项目(TD13-5043)

Axial tensile properties of three-dimensional woven composites with variant structure

LIU Junling1,2, SUN Ying1,2, CHEN Li1,2()   

  1. 1. Key Laboratory of Advanced Textile Composites, Tianjin and Ministry of Education, Tiangong University, Tianjin 300387, China
    2. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
  • Received:2019-08-26 Revised:2019-09-15 Online:2019-12-15 Published:2019-12-18
  • Contact: CHEN Li

摘要:

为克服加纱或减纱造成三维机织预制体交织结构的局部变异,进而对复合材料的力学性能产生一定的影响,采用加纱和减纱相结合的方法分别制备了4种三维机织石英纤维树脂基复合材料,结合拓扑方法建立了加减纱区域的路径,利用数字图像相关技术研究了拉伸过程中全场纵向应变变化。结果表明:引入加、减纱变异结构试样的拉伸强度和拉伸模量的保留率分别大于93.0%和88.0%,断裂伸长率无明显差异,且与未引入加、减纱试样在拉伸过程中的力学响应规律、断裂失效模式基本一致;应变云图表明损伤起始于交织点,引入加减纱的试样其高应变集中在加减纱“点”处,同时存在富树脂低应变区域与之对应。

关键词: 三维机织复合材料, 变异结构, 加纱, 减纱, 拉伸性能

Abstract:

Aiming at the problem that adding yarns or cutting yarns method will cause local variation of the interlace structure of the three-dimensional (3-D) woven preform, which will further affect the mechanical properties of the composite, four types of 3-D woven quartz fiber resin matrix composites were manufactured by adding yarns and cutting yarns in combination. The yarn path of the adding and cutting yarns regions were established by observation and topological method, and the digital image correlation technology was adopted to study the full field longitudinal strain change during the stretching process. The experiment results show that the samples with added and cut yarns have higher strength and modulus retention of more than 93.0% and 88.0% respectively, and have no significant difference in elongation at break. The mechanical response and fracture failure mode during the tensile test are consistent with the samples without the added and cut yarns. The strain map indicates that the damage oneset at the interlacing point, and the high strain of the samples with added and cut yarns was concentrated at the point of adding and cutting yarns, which is correspondent to the resin-rich low strain region.

Key words: three-dimensional woven composite, variant structure, adding yarn, cutting yarn, tensile property

中图分类号: 

  • TB332

表1

试样结构参数"

类别 试样
编号
经纱 衬经纱 纬纱 衬纬纱
层数 线密
密度/
(根·cm-1)
层数 线密
密度/
(根·cm-1)
层数 线密
密度/
(根·cm-1)
层数 线密
密度/
(根·cm-1)
层层正交角联锁 A4 4 190 tex×2 10 190 tex×2 5 190 tex×3 4.2 190 tex×3
衬经层层正交角联锁 A4P 4 190 tex×2 5 4 190 tex×2 5 5 190 tex×3 4.2 190 tex×3
层层斜交角联锁 A4T 4 190 tex×2 10 190 tex×2 5 190 tex×3 2.1 3 190 tex×3 2.1
衬经层层斜交角联锁 A4PT 4 190 tex×2 5 4 190 tex×2 5 5 190 tex×3 2.1 3 190 tex×3 2.1

图1

经纱排列"

图2

预制件表面形貌及结构示意图 注:试样编号中J表示“加、减纱”。"

表2

经纱偏移角"

试样
编号
次数 经纬纱夹角-90°/(°)
减纱点左 减纱点右 加纱点左 加纱点右
A4-J 第1次 17.8 19.7 18.7 16.4
第2次 12.2 12.6 12.1 11.6
A4T-J 第1次 5.5 5.8 5.3 4.2
第2次 2.7 3.7 3.1 2.4
A4P-J 第1次 16.7 17.5 17.2 17.1
第2次 6.1 5.3 6.3 5.6
A4PT-J 第1次 6.4 7.4 6.7 5.6
第2次 3.4 3.4 3.5 3.1

图3

DIC系统联合拉伸实验"

表3

8种试样拉伸测试结果"

试样
编号
拉伸模量/GPa 拉伸强度/MPa 泊松比
经向 CV值/% 经向 CV值/% 经向 CV值/%
A4 17.22 6.3 279.09 4.20 0.113 10.6
A4-J 16.39 4.6 260.98 8.0 0.116 7.8
A4T 24.33 4.7 405.07 5.4 0.105 24.3
A4T-J 21.49 5.2 389.48 6.2 0.145 12.2
A4P 21.64 7.2 400.27 5.7 0.134 17.8
A4P-J 19.81 6.2 379.08 4.6 0.127 16.5
A4PT 22.56 4.0 415.63 6.0 0.103 22.3
A4PT-J 20.56 6.1 392.45 4.1 0.097 14.5

图4

8种试样应力-应变曲线"

图5

8种试样在不同应变阶段的纵向应变分布"

图6

8种试样的断裂形貌"

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