Dispersion of Elastic Waves and the Nondestructive Testing of Composite Materials

2009 ◽  
pp. 165-165-19 ◽  
Author(s):  
W Sachse ◽  
CS Ting ◽  
A Hemenway
Keyword(s):  
Composite Materials ◽  
Nondestructive Testing ◽  
Elastic Waves

Specific Features of Nondestructive Testing of Polymer and Composite Materials Using Air-Coupled Ultrasonic Excitation and Laser Vibrometry

2021 ◽  
Vol 57 (8) ◽  
pp. 647-655
Author(s):  
V. Yu. Shpil’noi ◽  
V. P. Vavilov ◽  
D. A. Derusova ◽  
N. V. Druzhinin ◽  
A. Yu. Yamanovskaya
Keyword(s):  
Composite Materials ◽  
Nondestructive Testing ◽  
Laser Vibrometry

scholarly journals Application and evaluation of the technical condition of composite materials in aircraft and unmanned aerial vehicles by acoustic emission method of nondestructive testing

2022 ◽  
Vol 21 (4) ◽  
pp. 328-336
Author(s):  
A. V. Popov ◽  
A. O. Samuylov ◽  
I. S. Cherepanov
Keyword(s):  
Acoustic Emission ◽  
Composite Materials ◽  
Nondestructive Testing ◽  
Unmanned Aerial Vehicles ◽  
Technical Condition ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Software Complex ◽  
Aerial Vehicles ◽  
Aerial Vehicle

Introduction. The paper analyzes the application of composite materials as the main determining method of reducing the mass of the airframe and an unmanned aerial vehicle. Advanced nondestructive testing methods provide assessing the technical condition of these materials, as well as determining stress concentrators on the airframe and an unmanned aerial vehicle with high accuracy in order to make a decision on the further operation of this object under control. The objective of the work was to increase the accuracy and efficiency of the assessment of crack resistance of composite materials through the acoustic emission control.Materials and Methods. This paper presents the nomenclature of composite materials used in the construction of various aircraft, including unmanned aerial vehicles. The most possible probable defects of these materials due to the influence of operational factors are presented. The applied methods of nondestructive testing of composite material and selection of the most suitable one according to specific advantages were compared. An experiment was carried out to determine the strength limits of carbon fiber using a hardware and software complex by acoustic emission method. The research results are presented in the form of drawings projected by the hardware and software complex.Results. The application of the acoustic-emission method of composite material control is described.Discussion and Conclusions. The results obtained experimentally can be used in the process of determining the strength limits of various composite materials by the acoustic emission method of nondestructive testing to assess the technical condition in mechanical engineering, shipbuilding, and aircraft construction. The paper is recommended to researchers involved in the design of aircraft and unmanned aerial vehicles.

Elastic Waves in Periodic Composite Materials

1996 ◽  
pp. 143-164 ◽  
Author(s):  
M. Kafesaki ◽  
E. N. Economou ◽  
M. M. Sigalas
Keyword(s):  
Composite Materials ◽  
Elastic Waves ◽  
Periodic Composite

scholarly journals Using Hilbert Transform in Diagnostic of Composite Materials by Impedance Method

2020 ◽  
Vol 64 (4) ◽  
pp. 334-342 ◽  
Author(s):  
Volodymyr Eremenko ◽  
Artur Zaporozhets ◽  
Vitalii Babak ◽  
Volodymyr Isaienko ◽  
Kateryna Babikova
Keyword(s):  
Composite Materials ◽  
Nondestructive Testing ◽  
Hilbert Transform ◽  
Instantaneous Frequency ◽  
Information Quality ◽  
Low Frequency ◽  
Mechanical Impedance ◽  
Phase Characteristic ◽  
Impedance Method ◽  
Materials Testing

The article is devoted to the problem of the increasing of information quality for the impedance method of nondestructive testing. The purpose of this article is to get for the pulsed impedance method of nondestructive testing the additional informative parameters. Instantaneous values of the information signal's amplitude is a sensitive parameter to the effects of interference, in particular friction, which necessitates the use of additional informative features. It was experimentally measured signals from defective and defectless areas of the test pattern. Using of the Hilbert transform gave possibility to determine phase characteristics of these signals and realize demodulation to extract a low-frequency envelope for further analysis of its shape. It was received the informative features as a result of researches. Among them are instantaneous frequency of a signal, the integral of a phase characteristic on the selected interval and the integral of a difference signal phase characteristics. In order to compare quality of the defect detection using selected parameters it was carried out evaluation of the testing result reliability for a product fragment made of a composite material. Considering the influence of the change in the mechanical impedance of the researched area on the phase-frequency characteristics of the output signal of the converter, it is proposed to use as the diagnostic signs: the instantaneous frequency and the value of the phase characteristic of the current signal for certain points in time. The proposed informative features enable to increase general reliability of composite materials testing by the pulsed impedance method.

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