Research on Health Monitor for Three-dimensional Braided Composite Material

2011 ◽  
Author(s):  
Li Yi ◽  
Wan Zhenkai ◽  
Li Jialu
Keyword(s):  
Composite Material ◽  
Three Dimensional ◽  
Braided Composite ◽  
Health Monitor

Fatigue behaviors of four-step three-dimensional braided composite material: a meso-scale approach computation

2014 ◽  
Vol 84 (18) ◽  
pp. 1915-1930 ◽  
Author(s):  
Liwei Wu ◽  
Bohong Gu
Keyword(s):  
Composite Material ◽  
Three Dimensional ◽  
Scale Model ◽  
Bending Fatigue ◽  
Braided Composite ◽  
Three Point Bending ◽  
High Fatigue ◽  
Distribution Energy ◽  
Bending Loading ◽  
Meso Scale

This paper reports the computational results of the bending fatigue behaviors of four-step three-dimensional rectangular braided composite materials from a meso-scale approach. A full-size meso-scale model of a four-step three-dimensional braided composite was established to numerically analyze the deformation and damage under cyclic bending loading. The stress distribution, energy absorption, hysteresis loop features and damage morphologies were obtained to explain the structural effects on the deformation and damage of the three-dimensional braided composite material subjected to three-point bending cyclic loading. The influences of the microstructure on the fatigue behaviors have been discussed for designing the three-dimensional braided composite material with high fatigue damage tolerance.

Research on Acoustic Emission Signal of Three Dimensional Braided Composite Material

2011 ◽  
Vol 48-49 ◽  
pp. 1395-1400
Author(s):  
Yi Li ◽  
Zhen Kai Wan ◽  
Jia Lu Li
Keyword(s):  
Acoustic Emission ◽  
Composite Material ◽  
Mechanical Test ◽  
Three Dimensional ◽  
Emission Source ◽  
Wave Form ◽  
Form Analysis ◽  
Braided Composite ◽  
Emission Signal ◽  
Acoustic Emission Source

This paper discusses the application and experimental method of acoustic emission for the three-dimensional (3D) braided composite material under flexural testing. It describes the feature of acoustic emission when applied to three-dimensional braided composite material under flexural testing. In order to know the materials damage position precisely, it is very important to collect the signal of acoustic emission source. The results of flexural experiment show that it is precise on the research of acoustic emission source location by the method of wave form analysis .During the collecting signal of acoustic emission , it is compared between parameter analysis and wave form analysis. According to the attenution degree of signal, it is selected signal of acoustic emission source exactly. It is the method to extract the precise acoustic emission signal by the different algorithm of wavelet analysis. We know that humans have been using materials by testing activities support, these tests have developed several centuries. From the traditional rough test to support materials and materials used in all aspects of science and technology, modern, scientific program, at present, there are mutual dependencies between the progress of scientific knowledge and the development of test methods. The 3D braided composite material is a kind of complex structure. Because of the many components and weaving material preparation process characteristic, material mechanics behavior is very complicated. It is characteristics of the 3D braided composite material, that the application on composites is widely more and more. The 3d braided composites have been used widely in aerospace, aviation, transportation, chemical, sports, medical care and other fields, so it is extremely vital significance for research on mechanics performance analysis of 3D braided composite material. Current studies of damage fracture behavior of composite materials are used in homogeneous materials research methods, namely the mechanical test and microscopic observation, but the research cannot distinguish and identify different damage fracture source, due to the combination of mechanical test parameters of the complex fracture micro-mechanism not sensitive. Microscopic observation is in fact observation later, local fracture surface morphology research, so can not observe the interaction of numerous fracture source and micro behavior, and can not study in the character of fracture source of composite materials, therefore the source faults already can not adapt to the traditional methods of composite material damage fracture process. From external or internal force effect material and structure produced deformation or fracture with elastic wave form, the strain energy release phenomenon called acoustic emission or stress wave [1]. Acoustic emission testing method is a kind of material internal defects or potential defects in the dynamic changes in movement, the damage detection method is real-time monitoring and can reflect the characteristics of acoustic emission sources in the load of the dynamic response. The AE information can directly reflect defects and changes [2, 3].

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 Health Monitor for Three-Dimensional Braided Composite Material Products Condition Based on FBG

2010 ◽  
Vol 160-162 ◽  
pp. 1756-1761 ◽  
Author(s):  
Yi Li ◽  
Zhen Kai Wan ◽  
Jia Lu Li
Keyword(s):  
Mechanical Property ◽  
Composite Materials ◽  
Three Dimensional ◽  
Local Strain ◽  
Braided Composites ◽  
Braided Composite ◽  
3D Braided Composites ◽  
Signal Collection ◽  
Fbg Sensors ◽  
Health Monitor

This paper describes the method of Fiber Bragg Grating(FBG)embedded in the three-dimensional(3D) braded composite materials and provides the method of health monitor for 3D braided composite materials condition. The paper 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. In the process of load-supporting, the internal local strain of 3D braided composites is much more, and local strain has certain interference on embedded near FBG output. 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. This research provides basis for the study and application of advanced intelligent composites.

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