Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (04): 58-63.doi: 10.13475/j.fzxb.20190404506

• Textile Engineering • Previous Articles     Next Articles

Damage monitoring of composite materials based on twist energy of carbon nanotube yarns

LI Peng1, WAN Zhenkai2(), JIA Minrui1   

  1. 1. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
    2. Engineering Teaching Center, Tiangong University, Tianjin 300387, China
  • Received:2019-04-16 Revised:2020-01-06 Online:2020-04-15 Published:2020-04-27
  • Contact: WAN Zhenkai E-mail:wanzhenkai@tjpu.edu.cn

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Abstract:

In order to achieve comprehensive monitoring of internal damage of aerospace structural specimens, a new real-time monitoring method was proposed based on the new discovery of the twisting energy feature of carbon nanotube yarns. This method uses three-dimensional six-directional braiding technology to embed carbon nanotube yarns into aerospace composite structural specimens to construct the new type of intelligent three-dimensional composite material. Studies have proved that when internal damage occurs in specimens, the twist of the carbon nanotube yarns embedded inside the specimens will change and generate twisting energy. The principal component analysis and damage index theory were used to analyze the twisting energy data of carbon nanotube yarns. The experimental results show that the resin fractures, holes and tiny cracks in the three-dimensional braiding composite specimens will cause changes in twist electric energy. The twist electric energy of carbon nanotube yarns has a high recognition accuracy of the internal damage of the specimens, which reaches 0.002 mm in this research. This finding has of practical significance for the advancement of intelligent monitoring of aerospace structures.

Key words: carbon nanotube yarn, twist electric energy, three-dimensional six-directional braiding, damage index, damage monitoring of composite material

CLC Number: 

  • TS101.2

Fig.1

Schematic diagram of three-dimensional braiding machine"

Fig.2

Schematic diagram of carriers arrangement for three-dimensional six-direction braiding"

Fig.3

Test specimens of composite material"

Tab.1

Parameters of specimen for three-dimensional braided composite material"

试件
编号		 平均编
织角/(°)		 纤维体积
分数/%		 CNT纱线扭
曲角/(°)
1# 29.1 47.1 25
2# 26.3 49.2 27
3# 36.4 56.7 26

Fig.4

Correspondence diagram of stress strain and twist energy charge change"

Fig.5

T2 value of specimens 1# and 2# in first stretching"

Fig.6

Q value of specimens 1# and 2# in first stretching"

Fig.7

T2 value of specimens 1# and 2# in second stretching"

Fig.8

Q value of specimens 1# and 2# in second stretching"

Fig.9

T2 value of specimens 1# and 3# in stretching"

Fig.10

Q value of specimens 1# and 3# in stretching"

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[2] . Damage index characteristics of large-size 3-D braided composites [J]. Journal of Textile Research, 2018, 39(09): 65-70.
[3] . Parameter design and variation characteristics of carbon nanotube yarns in intelligent composites [J]. JOURNAL OF TEXTILE RESEARCH, 2018, 39(06): 58-63.
[4] . Structural damage evaluation of three-dimensional braided composite based on damage index [J]. JOURNAL OF TEXTILE RESEARCH, 2017, 38(05): 69-74.
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