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Our publications on application of the acoustic emission method
Features of the AE Testing of Equipment on Operating Mode

Features of the AE Testing of Equipment on Operating Mode
Dmitry CHERNOV 1, Sergey ELIZAROV 1, Vera BARAT 1, Igor Vasilyev 2
1INTERUNIS-IT LLC, Moscow, Russia; Phone: +7 495 3617673; e-mail: chernovdv@interunis-it.ru
2Blagonravov Institute of Machine Science, Russian Academy of Sciences, Moscow, Russia

Composite materials are very widespread in aerospace, reinfinery and chemical industries. The wide application may be explained by the improved mechanical properties -ultimate tensile strength, flexural modulus and small specific density.
The nondesctructive evaluation of the composite materials is an actual and complicate problem. Traditional ultrasonic, thermal and electromagnetic NDT methods have a limited application which is explained by anisopropic properties of the composite materials. This study focuses on the problems of acoustic emission arrising during the composite materials testing.
In the case of the composite materials AE testing has a set of specific features, for example, high AE activity even at the beginning of the structure loading, diversity of AE signals waveforms and spectra from the different AE source (fiber breakage, matrix cracking, destruction of the adhesive layer). Novel AE data registration method adapted for composite materials was offered in this sudy. This method takes into account the multiform and multiscale character of AE data. It allows to separate AE impulses from the different sources – fiber and matrix and as result - estimate the intensity of destruction for each component of the composite material separetelly. Authors also proposed improved criteria and improved location algorithm for the composite materials.