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

2017 ◽  
Vol 24 (5) ◽  
pp. 791-798 ◽  
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.

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

2017 ◽  
Vol 24 (2) ◽  
pp. 213-220 ◽  
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.

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

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.

Research on Fabricating Technology of Three Dimensional Integrated Braided Composite I Beam

2010 ◽  
Vol 136 ◽  
pp. 59-63 ◽  
Author(s):  
X.Y. Pei ◽  
Jia Lu Li
Keyword(s):  
Cross Section ◽  
High Performance ◽  
Research Result ◽  
Three Dimensional ◽  
Void Content ◽  
Braided Composites ◽  
Braided Composite ◽  
Transfer Molding ◽  
3D Braided Composites

In this paper the fabricating technology of three dimensional (3D) integrated braided composite I beam is researched, including: braiding technology of 3D braided I beam preform, the orientation of fiber-tow in the I beam preform, the optimizing of process parameters of resin transfer molding (RTM) for 3D braided composite I beam, and the design of mould for consolidation of composite I beam. The quality of 3D braided composites is good analyzed by ultrasonic A-scan, void content calculation and microscope observation. The research result will provide a good way for designing and fabricating high performance 3D integrated braided composite components with irregular cross section.

Enhancement of mechanical and electromagnetic absorbing properties of carbon/glass hybrid composites with a three-dimensional quasi-isotropic braided structure

2019 ◽  
Vol 89 (23-24) ◽  
pp. 4896-4905 ◽  
Author(s):  
Wei Fan ◽  
Lili Xue ◽  
Tongxue Wei ◽  
Jingjing Dong ◽  
Juanzi Li ◽  
...  
Keyword(s):  
Hybrid Composites ◽  
Glass Fibers ◽  
Three Dimensional ◽  
Laminated Composite ◽  
External Stress ◽  
Braided Composites ◽  
Braided Composite ◽  
Braided Structure ◽  
Electromagnetic Transmission ◽  
Ku Band

Two carbon/glass hybrid composites with different reinforced structures were designed and their mechanical and electromagnetic absorbing properties (EMAPs) were investigated in this paper. It was found that the tensile, bending, and double-notch shear strength of the three-dimensional (3D) quasi-isotropic (QI)-braided composite were 4.50%, 9.64%, and 14.29% higher than those of the QI-laminated composite, respectively. This was because Z-binder yarns in the 3D QI-braided composite can lock all yarn sets together to bear external stress and inhibit crack propagation in interlamination. The EMAPs of the 3D QI-braided composites were larger than that of the QI-laminated composite in the entire Ku band. This was because the Z-directional glass fibers in the 3D QI-braided composite were beneficial for electromagnetic transmission. The uniform arrangement of five sets of yarns (+45°, –45°, 90°, 0°, and Z-yarns) resulted in the 3D QI-braided composites having better QI-EMAPs and QI mechanical properties in plane and outstanding interlayer performance than the traditional carbon fiber laminated composite.

Three-dimensional braided composites with zero, negative and isotropic thermal expansion behavior

2020 ◽  
Vol 54 (13) ◽  
pp. 1761-1781
Author(s):  
SA Pottigar ◽  
B Santhosh ◽  
RG Nair ◽  
P Punith ◽  
PJ Guruprasad ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Volume Fraction ◽  
Coefficient Of Thermal Expansion ◽  
Three Dimensional ◽  
Braided Composites ◽  
Fiber Volume ◽  
Braided Composite ◽  
Expansion Behavior ◽  
Unit Cells ◽  
Composite Configuration

Three-dimensional braided composites with zero, negative and isotropic coefficient of thermal expansion are presented based on an analytical homogenization technique. The configuration of the braided composites is worked out considering the exact jamming condition leading to higher fiber volume fraction. A total of four configurations of three-dimensional-braided composite representative unit cells were analyzed. Among these, two arrangements are 4-axes and the other two are 5-axes. Special emphasis is given on the detailed description of the representative unit cells. Analysis reveals that a three-dimensional-braided composite configuration with thermoelastic isotropic properties having same coefficient of thermal expansion along x-, y-, and z-axes is achievable. As a special case, the homogenization model is used to predict, for the first time, a configuration of braided architecture and material leading to zero coefficient of thermal expansion along x-, y- and z-directions.

Strength Predication for Load-Bearing Lugs of Three-Dimensional Braided Composites

2007 ◽  
Vol 353-358 ◽  
pp. 1948-1951 ◽  
Author(s):  
Xi Tao Zheng ◽  
Qin Sun ◽  
Ying Nan Guo ◽  
Ya Nan Chai
Keyword(s):  
Failure Modes ◽  
Three Dimensional ◽  
Strain Gages ◽  
Braided Composites ◽  
Stress Concentrations ◽  
Shell Elements ◽  
Braided Composite ◽  
Load Response ◽  
Fiber Tension ◽  
Bearing Failures

Load response and failure modes of three-dimensional (3-d) four-directional braided composite lugs were studied analytically and experimentally. The objective of the study was to get information on the stiffness, strength and failure mode of the lug, as well as on the applicability of the analysis method used to predict lug load response and failure. The test lugs were manufactured with the RTM (Resin Transfer Molding) technique. The test specimens were loaded parallel to the lug centerline. Two types of specimens were tested to failure. Three of them were instrumented with 18 strain gages in each type of lug. There are three basic failure modes in braided composite joints: net-tension, shear-out, and bearing. Net-tension failure is associated with matrix and fiber tension failure due to stress concentrations. Shear-out and bearing failures result primarily from the shear and compression failures of fiber and matrix. The analyses were performed using finite element method. Shell elements were used. A steel pin was modeled to apply the loading. The loading was applied with a constant force distribution through the center of the pin. A contact was defined between the pin and the surrounding lug surface. The measured strains showed fairly good correlation with the analysis results. The strain response was almost linear. It can be concluded that with correct material properties the FE approach used in the analyses can provide a reasonable estimate for the load response and failure of 3-d braided composite lugs

Research on Health Monitor for Three-Dimensional Braided Composite Material

2011 ◽  
Vol 48-49 ◽  
pp. 1389-1394
Author(s):  
Yi Li ◽  
Zhen Kai Wan ◽  
Jia Lu Li
Keyword(s):  
Composite Materials ◽  
Health Monitoring ◽  
Three Dimensional ◽  
Dynamic Monitoring ◽  
Monitoring Methods ◽  
Braided Composites ◽  
Monitoring Method ◽  
Braided Composite ◽  
3D Braided Composites ◽  
Health Monitor

This paper describes two methods of Fiber Bragg Grating (FBG) embedded in the three-dimensional (3D) braded composite materials and acoustic emission health monitor for 3D braided composite materials condition. The paper mainly analyses the relations of FBG change and the inner straining under the stretching on materials. It is provided that the way of signal collection and processing. The experimental results proved that FBG sensors have exceptional sense characteristic. The braided angle of composites has a little influence on FBG signal. FBG embedded in the 3D braided composite materials has not more effect mechanical property of materials. According to two health monitoring methods and the particularity of 3D braided composites, the health monitoring method based on FBG much more applies to dynamic monitoring on 3D composites special field. This research provides basis for the study and application of advanced intelligent composites.

Structural Health Monitoring (SHM) of Three-Dimensional Braided Composite Material using Carbon Nanotube Thread Sensors

2013 ◽  
Vol 29 (4) ◽  
pp. 617-621 ◽  
Author(s):  
Z. Wan ◽  
J. D. Li ◽  
M. Jia ◽  
J. L. Li
Keyword(s):  
Composite Material ◽  
Carbon Nanotube ◽  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Smart Materials ◽  
Early Stage ◽  
Three Dimensional ◽  
Braided Composite ◽  
Structural Health ◽  
Smart Composite Materials

ABSTRACTStructural Health Monitoring (SHM) takes advantage of the recent advances in nanotechnology and sensing in order to monitor the behavior of a structure, assess its performance and identify damage at an early stage. Monitoring the state of strain throughout an entire structure is essential to determine its state of stress, detect potential residual stresses after fabrication, and also to help to establish its integrity. The Carbon nanotube thread was integrated into three-dimensional braiding materials and used for the first time as a sensor to monitor strain and also to detect damage in the three-dimensional braided composite material.In this paper a literature review about the application of carbon nanotubes thread for sensors and smart materials used for SHM of braiding structures is presented. The test data show the braided angle is important parameter for structural health monitoring of three-dimensional. The research will provide a new integrated and distributed technologies for the built-in carbon nanotube sensor to detect the health of composite. The subject will provide the new idea and method for the development of smart composite materials research and application.

Research on FBG in 3-D Braided Composite Structure Health Monitoring

2011 ◽  
Vol 298 ◽  
pp. 68-72 ◽  
Author(s):  
Ming Wei Ding ◽  
Zhen Kai Wan ◽  
Yong Xin Ma
Keyword(s):  
Health Monitoring ◽  
Composite Structure ◽  
Three Dimensional ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Braided Composites ◽  
Structure Health Monitoring ◽  
Braided Composite ◽  
Fundamental Structure ◽  
Monitoring Temperature

In this work, the application status and significance of Fiber Bragg Gratings（FBGs） and Three-dimensional (3-D) braided composites were briefly introduced, so were the fundamental structure of 3-D braided composites and the sensing mechanism of FBGs in them. Combined with the characteristics of 3-D braiding technology, this paper presents a primary theoretical solution for synchronously monitoring temperature and strain inside Three-dimensional (3-D) braided composites, and further analysis were made about it. It was shown by experiment that the application of FBGs in the structure health monitoring in 3-D braided composites has great potential.

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