Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (05): 79-84.doi: 10.13475/j.fzxb.20190507806

• Textile Engineering • Previous Articles     Next Articles

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 E-mail:chenge@dhu.edu.cn

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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

CLC Number: 

  • TB332

Tab.1

Properties of matrix and carbon fiber"

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

Fig.1

Geometry and dimensions of specimen. (a) Un-notched coupon; (b) Open-hole coupon"

Fig.2

Photographs of cross-sectional areas of 3-D braided composite. (a) Section of test piece 1(×10);(b) Section of test piece 2(×50)"

Fig.3

Support fixture for open-hole test. (a) Fixture assembly; (b) Fixture installation for notched compression testing"

Fig.4

IITRI test equipment. (a) Fixture installation for un-notched compression testing; (b) Un-notched specimen assembly"

Fig.5

Load-Displacement curves of un-notched 3-D braided composites under quasi-static compressive"

Fig.6

Quasi-static compression tests of 3D braided composite with open hole: Load vs. Displacement curves"

Tab.2

Compressive properties"

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

Tab.3

Comparison of compressive properties"

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

Fig.7

Comparison of compression properties of two type 3-D braided composites with laminates"

Fig.8

Photographs of un-notched specimens after compression test"

Fig.9

Photographs of Notched specimens after compression tests"

Fig.10

Fracture crack"

Fig.11

Fracture surface of specimen after compression tests. (a) Open hole; (b) Without hole"

Fig.12

SEM images of fracture surface of Style II"

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