开孔三维机织复合材料的拉伸性能

doi:10.13475/j.fzxb.20210505207

纺织学报 ›› 2022, Vol. 43 ›› Issue (08): 74-79.doi: 10.13475/j.fzxb.20210505207

开孔三维机织复合材料的拉伸性能

孙晓伦¹^,², 陈利¹^,², 张一帆¹^,²(), 李默涵¹^,²

1.天津工业大学先进纺织复合材料教育部重点实验室, 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:2021-05-21 修回日期:2021-12-15 出版日期:2022-08-15 发布日期:2022-08-24
通讯作者: 张一帆
作者简介:孙晓伦(1996—),男,硕士生。主要研究方向为纺织复合材料结构设计及力学性能评价。
基金资助:
国家自然科学基金项目(11802203);天津市自然科学基金项目(18JCQNJC73200);装备预研重点实验室基金项目(61429040403);天津市科技计划项目(18ZXJMTG00190);天津市高等学校创新团队培养计划项目(TD13–5043)

Tensile properties of 3-D woven composites with holes

SUN Xiaolun¹^,², CHEN Li¹^,², ZHANG Yifan¹^,²(), LI Mohan¹^,²

1. Key Laboratory of Advanced Textile Composite Materials, Ministry of Education, Tiangong University, Tianjin 300387, China
2. College of Textile Science and Engineering, Tiangong University, Tianjin 300387, China

Received:2021-05-21 Revised:2021-12-15 Published:2022-08-15 Online:2022-08-24
Contact: ZHANG Yifan

摘要/Abstract

摘要：

为研究开孔尺寸对三维机织复合材料拉伸力学行为、破坏模式以及失效机制的影响规律,设计了3种不同孔径的三维机织复合材料试样,利用非接触全场应变测试系统和显微图像技术进行表征。结果表明:6、10、14 mm 的孔径对三维机织复合材料的拉伸模量几乎没有影响,开孔后全截面拉伸强度分别下降35.6％、44.5％和51.8％,但开孔后的净截面拉伸强度基本相同,与未开孔试样相比,平均拉伸强度下降约22.4％;未开孔试样的全场应变呈现均匀分布,而开孔试样在孔左右两侧呈现出应变集中;开孔试样的断口形貌相似,主要表现为经纱的断裂,并伴随有部分纱线的抽拔以及层间开裂。

关键词: 三维机织复合材料, 开孔, 拉伸性能, 孔径, 应力集中, 失效机制

Abstract:

In order to investigate the effect of aperture on the tensile mechanical behavior, damage mode and failure mechanism of three-dimensional(3-D)woven composites with holes, three types of 3-D woven composite samples with different hole apertures were designed and digital image correlation system and micro-image technique were used for characterization. The results showed that the dimension of holes had little effect on the tensile modulus of 3-D woven composites, but the tensile strengths of the cross section of notched specimens with 6 mm, 10 mm and 14 mm holes decreased by 35.6％, 44.5％ and 51.8％ respectively. Their tensile strengths of the net section however were almost the same, and the average tensile strength decreased by approximately 22.4％ compared with the unnotched samples. The strain distributions of the unnotched specimen were uniform, while the strains of the notched specimens were mainly located at the left and right sides of the open holes. The fracture morphologies of the three notched samples were similar, and the main damage modes were the warp fracture along with fiber pull-out and interlaminar cracking.

Key words: three-dimensional woven composite, open hole, tensile property, aperture, stress concentration, failure mechanism

中图分类号:

TB332

孙晓伦, 陈利, 张一帆, 李默涵. 开孔三维机织复合材料的拉伸性能[J]. 纺织学报, 2022, 43(08): 74-79.

SUN Xiaolun, CHEN Li, ZHANG Yifan, LI Mohan. Tensile properties of 3-D woven composites with holes[J]. Journal of Textile Research, 2022, 43(08): 74-79.

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材料	密度/ (g·cm^–3)	线密度/tex	拉伸强度/MPa	弹性模量/GPa	上浆率/％
TG800HX–12K	1.8	500	5 678	290.0	1.5
TG800HXC–6K	1.8	250	5 678	290.0	1.5
TDE–86	1.2	—	80	3.5	—

纱线系统	纱线线密度/ tex	织物密度/ (根·cm^–1)	纱线层数	各纱线纤维体积含量/ ％	复合材料厚度/ mm	纤维体积含量/ ％
纬纱	1 000	4	5	26.02
衬经纱	1 000	4	4	20.82	4.26	54.63
接结经纱	250	4	4	7.79

开孔三维机织复合材料的拉伸性能

Tensile properties of 3-D woven composites with holes

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