Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (05): 53-58.doi: 10.13475/j.fzxb.20180503006

• Textile Engineering • Previous Articles     Next Articles

Structural damage identification of intelligent composite materials based on principal component analysis

WAN Li1(), GONG Liying2, JIA Minrui2   

  1. 1. Academic Affairs Office, Tianjin Medical University, Tianjin 300070, China
    2. Information Center, Tianjin Polytechnic University, Tianjin 300387, China
  • Received:2018-05-14 Revised:2019-02-12 Online:2019-05-15 Published:2019-05-21

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Abstract:

Aiming at the key problems in monitoring the structural state of three-dimensional braided composites, a method to build three-dimensional space-structured intelligent composite material was developed by embedding carbon nanotube yarns into the overall composites based on the three-dimensional six-directional braiding process. The damage index was adopte to realize the identification of the internal damage type of the intelligent composite specimen. For the internal damage of three-dimensional six-directional braided composite materials, four damage index performance characteristics were analyzed. Experiments show that combined damage index is better than the other three damage indexes and combined damage index can accurately identify the type of damage within the specimen. The three-dimensional braided composite material has small internal void damage and the combined damage index is less than 100. For internal crack damage of the composite specimen, combined damage index monitoring value is 300-500. When the combined damage index monitoring value is greater than 600, it can be judged that a large crack damage exists in the test specimens. Based on the damage index, the internal damage of the specimen can be calculated and the precision can reach 0.073 mm.

Key words: intelligent braided composite, three-dimensional six-directional braiding, principal component analysis, carbon nanotube yarn sensor, damage index

CLC Number: 

  • TS101.2

Fig.1

Schematic diagram of damage monitoring of 3-D braided composites specimen"

Fig.2

Schematic of three-dimensional braiding machine"

Fig.3

Schematic diagram of arrangement of carriers of three-dimensional six-directional braiding"

Fig.4

Three-dimensional six-directional composites preform embedded in carbon nanotube yarn"

Fig.5

Monitoring flowchart of internal damage for composite material based on PCA"

Tab.1

Parameters of 3-D braided composite materials"

编号 平均编织角/(°) 纤维体积含量/% 密度/(g·cm-3)
1# 30.4 57.1 1.55
2# 32.8 56.5 1.73
3# 29.5 52.1 1.64
4# 38.7 54.3 1.54

Fig.6

Test specimens"

Fig.7

T2 Damage index chart"

Fig.8

Q damage index chart"

Fig.9

Phi damage index chart"

Fig.10

I damage index chart"

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