Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (12): 162-168.doi: 10.13475/j.fzxb.20190806707

• Academic Salon Column for New Insight of Textile Science and Technology: Preparation Technology and • Previous Articles     Next Articles

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 E-mail:chenli@tjpu.edu.cn

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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

CLC Number: 

  • TB332

Tab.1

Structure parameters of samples"

类别 试样
编号		 经纱 衬经纱 纬纱 衬纬纱
层数 线密
度		 密度/
(根·cm-1)		 层数 线密
度		 密度/
(根·cm-1)		 层数 线密
度		 密度/
(根·cm-1)		 层数 线密
度		 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

Fig.1

Arrangements of warp yarns"

Fig.2

Surface morphology and structure of performs"

Tab.2

Offset angle of warp"

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

Fig.3

DIC combination of tensile test device"

Tab.3

Tensile test results of 8 specimens"

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

Fig.4

Stress-strain curves of 8 specimens. (a)Without adding or cutting yarn;(b)With adding or cutting yarn"

Fig.5

Longitudinal strain distributions of 8 specimens at different strain level"

Fig.6

Fracture morphologie of 8 specimens"

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