Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (03): 95-102.doi: 10.13475/j.fzxb.20210303508

• Textile Engineering • Previous Articles     Next Articles

Torsional mechanical properties and failure mechanism of braided carbon fiber reinforced composite tubes

GU Yuanhui1, ZHOU Hongtao1, ZHANG Diantang2, LIU Jingyan2(), WANG Shudong1   

  1. 1. Yancheng Polytechnic College, Yancheng, Jiangsu 224005, China
    2. Key Laboratory of Eco-Textiles(Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China
  • Received:2021-03-09 Revised:2021-08-07 Online:2022-03-15 Published:2022-03-29
  • Contact: LIU Jingyan E-mail:liujy@jiangnan.edu.cn

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Abstract:

In order to investigate the effect of layers on the torsional mechanical properties and failure modes of braided composite tubes, the over-braiding process and the vacuum-assisted resin infusion molding process were adopted in preparing 3 types of carbon fiber/resin braided composite tubes with 2, 3 and 4 layers. By setting up a non-contact full-field torsion strain test platform, the torsional mechanical responses of the braided composite tubes with different layers were studied. Using the scanning electron microscopy and microcomputer tomography technologies, the torsion failure mechanism of the braided composite tubes was analyzed. The results show that the braided composite tubes exhibit elastic and brittle fracture characteristics under torsional load, and spatial spiral shear band damage zones through the tube wall are formed. The increase in the number of braided layers promotes the stable spread of stress and strain, and reduces delamination damage of the overall structure. The failure torque of the composite tube with 4 braided layers reaches 450.00 N·m, which is 1.39 times and 2.20 times that of tubes with 3 and 2 braided layers, respectively. The failure modes mainly include fiber fracture or splitting, debonding, matrix cracking or chipping. There is little difference in the types of failure modes at the macro scale. But at the micro scale, the less the number of braided layers is associated to, the more obvious the fiber failure in the tubes.

Key words: carbon fiber reinforced composite, braided composite, tube, torsion property, braided layers, mechanical behavior, failure mechanism

CLC Number: 

  • TB332

Fig.1

Schematic of VARI"

Tab.1

Braided composite tubes structure parameters"

编织层数 内径d/mm 壁厚t/mm 纤维体积分数Vf/%
2 24.77 1.18 47.98
3 24.86 1.84 46.65
4 24.64 2.04 46.33

Fig.2

Design of torsion specimen of braided composite tube"

Fig.3

Torsional mechanical properties of specimens with different braiding layers. (a) Torque-twist angle curves; (b) Torsional stiffness"

Fig.4

Strain field cloud. (a) 2 layers; (b) 3 layers; (c) 4 layers"

Fig.5

Macroscopic torsional damage morphologies of specimens with different braiding layers. (a) 2 layers; (b) 3 layers; (c) 4 layers"

Fig.6

Micro computed tomograms of internal damage of specimens with different braiding layers. (a) 2 layers; (b) 3 layers; (c) 4 layers"

Fig.7

SEM images of damaged areas of specimens with different braiding layers. (a) 2 layers; (b) 3 layers; (c) 4 layers"

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