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Analysis of the Anisotropy of Sound Propagation Velocity in Thin Wooden Plates Using Lamb Waves
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SYSNO ASEP 0585292 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Analysis of the Anisotropy of Sound Propagation Velocity in Thin Wooden Plates Using Lamb Waves Author(s) Faktorova, D. (SK)
Stanciu, M. D. (RO)
Krbata, M. (SK)
Savin, A. (RO)
Kohutiar, M. (SK)
Chlada, Milan (UT-L) RID, ORCID
Nastac, S. M. (RO)Number of authors 7 Article number 753 Source Title Polymers. - : MDPI - ISSN 2073-4360
Roč. 16, č. 6 (2024)Number of pages 17 s. Publication form Online - E Language eng - English Country CH - Switzerland Keywords elastic-constants ; spruce ; varnish ; anisotropy ; Lamb waves ; coating treatments ; spruce ; maple OECD category Mechanical engineering Method of publishing Open access Institutional support UT-L - RVO:61388998 UT WOS 001192895900001 EID SCOPUS 85189101230 DOI https://doi.org/10.3390/polym16060753 Annotation The objective of the study was to analyze the influence of coating treatments on sound propagation speeds in thin boards, along the longitudinal and radial directions of resonance wood. The samples studied were thin boards made of spruce and maple wood with dimensions of 240 mm x 80 mm x 4 mm (length x width x thickness) subjected to different coating treatments (oil-based varnish and alcohol varnish) as well as unvarnished samples, exposed to radiation UV, and specimens treated in the saline fog. The test method consisted of evaluating the propagation speeds of Lamb waves applied to thin plates, according to a semicircular test model, so that the results highlighted both the acoustic response in the longitudinal and radial directions as well as the variation in the anisotropy of the samples with the change in the sound propagation direction relative to wood fibers. Based on the statistical analysis, sound propagation speed profiles were obtained in each of the 38 directions analyzed for all wood samples. The results highlighted that the oil-based varnish led to a decrease in the speed of propagation in the radial direction, compared to the alcoholic varnish, whose major effect was in the longitudinal direction, on the spruce wood. On maple wood, increasing the number of varnish layers, regardless of the type of varnish, led to a decrease in the anisotropy ratio between the longitudinal and radial directions. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2025 Electronic address https://www.mdpi.com/2073-4360/16/6/753
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