Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (08): 74-79.doi: 10.13475/j.fzxb.20210505207

• Textile Engineering • Previous Articles     Next Articles

Tensile properties of 3-D woven composites with holes

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

  1. 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 Online:2022-08-15 Published:2022-08-24
  • Contact: ZHANG Yifan E-mail:zhangyifan@tiangong.edu.cn

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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

CLC Number: 

  • TB332

Tab.1

Performance parameters of carbon fiber"

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 —

Fig.1

Sketch diagram of 3-D woven composites"

Tab.2

Parameter of woven fabrics and composites"

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

Fig.2

Tensile test process of 3-D woven composites with holes"

Fig.3

Cross section of open specimen"

Fig.4

Stress-strain curves of tensile tests of 3-D woven composites"

Fig.5

Maximum tensile strain of 3-D woven composites"

Fig.6

Tensile strain contours of 3-D woven composites"

Fig.7

Tensile strength and tensile modulus of 3-D woven composites"

Fig.8

Fracture morphology of 3-D woven composites"

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