Internal damage detection of three-dimensional four-step six-directional braided composites based on carbon nanotube thread sensor

Carbon nanotube (CNT) yarn sensors were embedded in 3D braided composites in the form of arrays to detect the internal damage of specimens and study the internal damage monitoring of the 3D braided composites. The signals collected by the sensor array of CNT yarn were preprocessed using the dynamic wavelet threshold algorithm. The exact position of the damage was calculated based on the main features of the resistance signal matrix, which was calculated using the quadratic matrix singular value. The results show that the internal damage localization of the specimens was consistent with the actual damage. The localizations in this study can provide a basis for enhancing the structural health monitoring of smart 3D braided composites.

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Characteristic analysis of carbon nanotube thread embedded into three-dimensional braided composite under bending load

Science and Engineering of Composite Materials ◽

10.1515/secm-2015-0447 ◽

2017 ◽

Vol 24 (5) ◽

pp. 791-798 ◽

Cited By ~ 2

Author(s):

Jian-Min Guo ◽

Li-Ying Gong ◽

Yan Liu

Keyword(s):

Carbon Nanotube ◽

Compressive Loading ◽

Three Dimensional ◽

Strain Sensing ◽

Braided Composites ◽

Characteristic Analysis ◽

Resistance Change ◽

Braided Composite ◽

Bending Load ◽

Embedded Method

AbstractIn this paper, we introduce an embedded method of carbon nanotube threads (CNTs) in three-dimensional (3-D) braided composite material preform. We investigate the strain sensing properties of CNTs embedded into 3-D braided composites using three-point bend test under different loads. The resistance change rate properties of CNTs in composites under tensile and compressive loading are analyzed in detail. Experimental results show that in the three-point bending process, the resistance of CNTs exponentially increases with the increase of strain until the specimen loading to fracture. Moreover, the residual resistance of CNTs has been observed after unloading. Our experiments have shown that structure health status of 3-D braided composites can be sensed and monitored in real-time using CNTs sensor under bending load. This study provides an experimental basis to lay the foundation for the structural health monitoring system construction of 3-D braided composites.

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Progressive Failure Simulation of Notched Tensile Specimen for Triaxially-Braided Composites

Materials ◽

10.3390/ma12050833 ◽

2019 ◽

Vol 12 (5) ◽

pp. 833 ◽

Cited By ~ 4

Author(s):

Zhenqiang Zhao ◽

Haoyuan Dang ◽

Jun Xing ◽

Xi Li ◽

Chao Zhang ◽

...

Keyword(s):

Three Dimensional ◽

Textile Composites ◽

Fiber Bundles ◽

Progressive Damage ◽

Interfacial Damage ◽

Braided Composites ◽

Internal Damage ◽

Notched Specimen ◽

Damage Behavior ◽

Damage Initiation

The mechanical characterization of textile composites is a challenging task, due to their nonuniform deformation and complicated failure phenomena. This article introduces a three-dimensional mesoscale finite element model to investigate the progressive damage behavior of a notched single-layer triaxially-braided composite subjected to axial tension. The damage initiation and propagation in fiber bundles are simulated using three-dimensional failure criteria and damage evolution law. A traction–separation law has been applied to predict the interfacial damage of fiber bundles. The proposed model is correlated and validated by the experimentally measured full field strain distributions and effective strength of the notched specimen. The progressive damage behavior of the fiber bundles is studied by examining the damage and stress contours at different loading stages. Parametric numerical studies are conducted to explore the role of modeling parameters and geometric characteristics on the internal damage behavior and global measured properties of the notched specimen. Moreover, the correlations of damage behavior, global stress–strain response, and the efficiency of the notched specimen are discussed in detail. The results of this paper deliver a throughout understanding of the damage behavior of braided composites and can help the specimen design of textile composites.

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Damage detection of three-dimensional braided composite materials using carbon nanotube thread

Science and Engineering of Composite Materials ◽

10.1515/secm-2013-0284 ◽

2017 ◽

Vol 24 (2) ◽

pp. 213-220 ◽

Cited By ~ 4

Author(s):

Zhenkai Wan ◽

Jianmin Guo ◽

Minrui Jia

Keyword(s):

Carbon Nanotube ◽

Damage Detection ◽

Electrical Resistance ◽

Early Stage ◽

Three Dimensional ◽

Effective Solution ◽

Strain Sensing ◽

Braided Composite ◽

Behavior Monitoring ◽

Surface Method

AbstractStructural health monitoring (SHM) takes advantage of the recent advances in structural behavior monitoring to assess the performance of a structure, identifying the damage in the early stage. In this study, a carbon nanotube thread strain sensor was fabricated into a three-dimensional (3D) braided composite preform for the strain sensing of SHM. We present the results of an investigation on a carbon nanotube thread network in 3D composites for damage detection, in which the variation of the electrical resistance of the carbon nanotube thread embedded into 3D composites was recorded. Based on the variation of the electrical resistance, the location and size of damages were estimated by the response surface method, providing an effective solution for the estimation of the location and size of damages in 3D composites.

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Strain-Sensing Characteristics of Carbon Nanotube Yarns Embedded in Three-Dimensional Braided Composites under Cyclic Loading

Discrete Dynamics in Nature and Society ◽

10.1155/2021/2427954 ◽

2021 ◽

Vol 2021 ◽

pp. 1-9

Author(s):

Huixiao Bai ◽

Gang Ding ◽

Shusheng Jia ◽

Jinguo Hao

Keyword(s):

Carbon Nanotube ◽

Cyclic Loading ◽

Damage Accumulation ◽

Three Dimensional ◽

Progressive Damage ◽

Strain Sensing ◽

Braided Composites ◽

3D Braided Composites ◽

Sensing Characteristics ◽

Carbon Nanotube Yarns

Carbon nanotube yarns are embedded in three-dimensional (3D) braided composites with five-axis yarns, which are used as strain sensors to monitor the damage of 3D braided composites. In the cyclic mechanical loading experiment, the strain-sensing characteristics of 3D braided composites were studied by in situ measuring the resistance change of the embedded carbon nanotube yarn. The 3D five-directional braided composite prefabricated part based on carbon nanotube yarns was developed, and the progressive damage accumulation experiments were carried out on carbon nanotube yarns and specimens embedded in carbon nanotube yarns. The research results show that there is a good correlation between the change of relative resistance of the carbon nanotube yarn and the strain of the composite specimen during cyclic loading and unloading. When the tensile degree of the specimen increases beyond a certain range, the carbon nanotube yarn sensor embedded in the specimen shows resistance hysteresis and produces residual resistance. Therefore, the fiber can better monitor the progressive damage accumulation of 3D five-direction braided composites.

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