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Investigation of Density of Samples Made of Thermally Expanded Graphite by Acoustic Amplitude-Shadow Method

  • ACOUSTIC METHODS
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Abstract

We present results of studying the sensitivity of an acoustic method for gaging the density of thermally expanded graphite (TEG) samples based on recording changes in the amplitude of a signal transmitted through the sample due to a change in density. They show that the maximum sensitivity of the method is comparable with the error of measurement of density and mass by the direct weight method, 26 kg/m3 and 0.02 g, respectively. The unevenness of the density distribution over the area of TEG samples of various thicknesses was estimated, while the deviation of the amplitude of the signal transmitted through the sample, proportional to the density deviation, reached up to 50% for some sheets, 30% for mats, and the smallest did not exceed 10%. During the scanning process, an inversely proportional dependence of the amplitude of the transmitted acoustic signal on the average sample density was revealed. This dependence was most pronounced for small thicknesses of TEG mats and sheets.

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ACKNOWLEDGEMENTS

The authors express their gratitude to the employees of the company OOO SILUR D.V. Smirnov and A.A. Ponomarev for the samples provided and the results of the verification of the methodology by the direct weight method.

Funding

This work was supported by the Russian Science Foundation, project no. 23-29-10167, https://rscf.ru/project/23-29-10167, and made use of the USF “Information and measurement complex for the study of acoustic properties of materials and products” (reg. no. 586308).

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Authors and Affiliations

  1. Kalashnikov Izhevsk State Technical University, 426069, Izhevsk, Russia

    O. P. Bogdan, O. V. Murav’eva, A. V. Blinova & D. V. Zlobin

  2. Udmurt Federal Research Center, Ural Branch, Russian Academy of Sciences, 426067, Izhevsk, Russia

    O. V. Murav’eva

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  1. O. P. Bogdan
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Correspondence to O. V. Murav’eva.

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Bogdan, O.P., Murav’eva, O.V., Blinova, A.V. et al. Investigation of Density of Samples Made of Thermally Expanded Graphite by Acoustic Amplitude-Shadow Method. Russ J Nondestruct Test 59, 857–867 (2023). https://doi.org/10.1134/S106183092370050X

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  • DOI: https://doi.org/10.1134/S106183092370050X

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