10.14489/td.2017.10.pp.028-035

2017, 10 October

DOI: 10.14489/td.2017.10.pp.028-035

Murashov V. V., Yakovleva S. I.
APPLICATION OF THE ACOUSTIC FREE VIBRATION METHOD FOR CONTROL OF THE STRUCTURES CONTAINING LAYERS FROM NON-METALLIC MATERIALS
(pp. 28-35)

Abstract. The physical principles of the acoustic free vibration method, areas ofits application and control features of the products from layered plastics, multilayerglud constructions, and also constructions with heat-protective coverings arediscussed. It is shown that the efficiency of the method largely depends on the range of frequencies spectrum excited by the product during an impact. It is established that the main sign of defects bythe control method of free vibration is changes in the amplitude of the signal in a specified band of frequencies and the main resonance frequency of the pulse freely damped oscillations. It is shown that the depth of the defect can be determined by experimentally determined logarithmic level of the oscillation amplitude and the known logarithmic level of the amplitude of the plate in the area of the defect located at a known depth. Operational opportunities and constraints in the application of free vibration method in identifying defects such as delaminations, disbonds, porosity of material etc. were identified.Methodical questions ofcontrol oftheconstructions containing layers from non-metallic materials are in detailconsidered. It is indicated that for the control of parts and constructions by the acoustic free vibration method the sizes of the detected defects is smaller than true defects.

Keywords: layered plastics, multilayer constructions, heat-protective coverings, non-destructivetesting, acoustic methods, free vibration method.

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V. V. Murashov, S. I. Yakovleva (FSUE “VIAM” SSC of the Russian Federation, Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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DOI: 10.14489/td.2017.10.pp.028-035

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