Research on Acoustic Emission Signal of Three-dimensional Braided Composite Material

2011 ◽  
Author(s):  
Li Yi ◽  
Wan Zhen-kai ◽  
Li Jia-lu
Keyword(s):  
Acoustic Emission ◽  
Composite Material ◽  
Acoustic Emission Signal ◽  
Three Dimensional ◽  
Braided Composite ◽  
Emission Signal

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].

scholarly journals MODEL OF ACOUSTIC EMISSION SIGNAL AT THE PREVAILING MECHANISM OF COMPOSITE MATERIAL MECHANICAL DESTRUCTION

Aviation ◽  
2010 ◽  
Vol 14 (4) ◽  
pp. 95-103 ◽  
Author(s):  
Sergey Filonenko ◽  
Tatiana Nimchenko ◽  
Alexandr Kosmach
Keyword(s):  
Acoustic Emission ◽  
Composite Material ◽  
Acoustic Emission Signal ◽  
Theoretical Research ◽  
Variable Velocity ◽  
Destruction Process ◽  
Mechanical Destruction ◽  
Research Results ◽  
Emission Signal ◽  
Signal Modelling

A model of acoustic emission signal formation at the prevailing mechanism of the destruction of composite materials is considered. The results of acoustic emission signal modelling are presented, taking into account the variable velocity of loading change. Acoustic emission signal experimental research results corresponding to theoretical research results are considered in this paper. It is shown that irregularity of the trailing edge of the acoustic emission signal is influenced by the change in the rate of the destruction process in composites. Santrauka Išnagrinetas akustines emisijos signalo modelis su vyraujančiu kompozitiniu medžiagu irimo mechanizmu. Pateikti akustines emisijos signalu modeliavimo rezultatai, ivertinant skirtinga apkrovos pasikeitimo greiti. Taip pat pateikti eksperimentinio akustines emisijos signalu tyrimo rezultatai, kurie sutampa su teoriniais tyrimais. Parodyta, kad akustines emisijos signalo galinio fronto netolygumas atsiranda tuomet, kai kinta kompozitines medžiagos irimo greitis.

scholarly journals IMPACT OF ROTATIONAL SPEED OF COMPOSITE FRICTION PAIR ON ENERGY ACCUMULATION IN ACOUSTIC EMISSION SIGNAL FORMATION

Aviation ◽  
2013 ◽  
Vol 17 (4) ◽  
pp. 129-136
Author(s):  
Sergey Filonenko ◽  
Aleksandr Kosmach
Keyword(s):  
Acoustic Emission ◽  
Composite Material ◽  
Total Energy ◽  
Acoustic Emission Signal ◽  
Rotational Speed ◽  
Friction Pair ◽  
Average Energy ◽  
Energy Accumulation ◽  
Emission Signal

The paper considers the results of modelling acoustic emission signals that form under variations in the rotational speed of a friction pair made of a composite material. It is found that the energy accumulation in acoustic emission signals that form relative to time takes place in accordance with linear law under normal wear of a friction pair. If the rotational speed of a friction pair increases, the rates of accumulated average energy and accumulated total energy of the acoustic emission signals that form also grow. The resulting acoustic emission signals have both accumulated average energy and accumulated total energy. A comparison of these two types of energy is conducted. It is shown that the application of data averaging reduces the rate of the accumulated energy of the acoustic emission signals that form.

Simulation Research on Acoustic Emission Signal of Tank Corrosion

2012 ◽  
Vol 503-504 ◽  
pp. 727-730
Author(s):  
Yang Yu ◽  
Yang Yu
Keyword(s):  
Acoustic Emission ◽  
Point Source ◽  
Acoustic Emission Signal ◽  
Three Dimensional ◽  
Simulation Software ◽  
Two Dimensional ◽  
Source Position ◽  
Emission Signal ◽  
Oil Tank ◽  
Dimensional Simulation

This paper studies the cylindrical acoustic emission signal generation, propagation and attenuation. Acoustic emission signal is a form of elastic waves and mechanical waves also. The large finite element physics simulation software COMSOL is used to simulate the propagation of acoustic emission signals coursed by the oil tank bottom corrosion. Simulation is divided into two parts，they are separately two-dimensional simulation and three-dimensional simulation. The bottom part of oil tank is two-dimensional simulation and the entire tank is three-dimensional simulation. Two-dimensional simulation is achieved in different situations. Strength of point source are the same in different positions, and the same point source position has different intensity. Acoustic emission wave propagation has a greater relationship with the media of dissemination, the point source position and the different interfaces.

scholarly journals ACOUSTIC EMISSION IN THE FRICTION OF COMPOSITE MATERIALS

Aviation ◽  
2014 ◽  
Vol 18 (2) ◽  
pp. 57-63 ◽  
Author(s):  
Sergey Filonenko ◽  
Aleksandr Kosmach
Keyword(s):  
Acoustic Emission ◽  
Composite Material ◽  
Composite Materials ◽  
Acoustic Emission Signal ◽  
Rotation Speed ◽  
Experimental Results ◽  
Material Surface ◽  
Parameter Change ◽  
Surface Layers ◽  
Emission Signal

The model of acoustic emission signal formation during friction and wearing of surfaces of composite materials was examined. The forms of acoustic emission resultant signals were shown. The regularities of parameter change in acoustic emission resultant signals with an increasing rotation speed were determined according to the results of modeling. It was found that theoretical and experimental results of acoustic emission signals registered during friction of composite material surface layers agree well.

Research of the cold resistance of metals by indentation with registration of an acoustic emission signal

2020 ◽  
pp. 61-64
Author(s):  
Yu.G. Kabaldin ◽  
A.A. Khlybov ◽  
M.S. Anosov ◽  
D.A. Shatagin
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Acoustic Emission ◽  
Acoustic Emission Signal ◽  
Low Temperatures ◽  
Cold Resistance ◽  
Emission Signal ◽  
Impact Bending ◽  
Artificial Neural

The study of metals in impact bending and indentation is considered. A bench is developed for assessing the character of failure on the example of 45 steel at low temperatures using the classification of acoustic emission signal pulses and a trained artificial neural network. The results of fractographic studies of samples on impact bending correlate well with the results of pulse recognition in the acoustic emission signal. Keywords acoustic emission, classification, artificial neural network, low temperature, character of failure, hardness. [email protected]

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