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Estimation via Laser Ultrasonics of the Ultrasonic Attenuation in a Polycrystalline Aluminum Thin Plate Using Complex Wavenumber Recovery in the Vicinity of a Zero-Group-Velocity Lamb Mode

Abstract : In this paper, we present a method to recover the complex wavenumber dispersion relations using spatial Laplace transform from experimental spatiotemporal signals measured by laser ultrasonic technique. The proposed method was applied on zero-group-velocity Lamb modes in order to extract the ultrasonic attenuation in a polycrystalline aluminum plate of about 70 μm thickness. The difference between the experimental and theoretical Laplace Fourier transforms was minimized in the least square sense to extract the complex amplitudes and complex wavenumbers of the modes at about 40 MHz. The experimental results were compared to values reported in the literature that were measured by other means and those estimated by using the quality factor extracted from a single temporal signal.
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https://hal-univ-lemans.archives-ouvertes.fr/hal-03752628
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Soumis le : mercredi 17 août 2022 - 09:43:29
Dernière modification le : jeudi 18 août 2022 - 03:35:16

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Guqi Yan, Samuel Raetz, Jean-Philippe Groby, Aroune Duclos, Alan Geslain, et al.. Estimation via Laser Ultrasonics of the Ultrasonic Attenuation in a Polycrystalline Aluminum Thin Plate Using Complex Wavenumber Recovery in the Vicinity of a Zero-Group-Velocity Lamb Mode. Applied Sciences, MDPI, 2021, 11 (15), pp.6924. ⟨10.3390/app11156924⟩. ⟨hal-03752628⟩

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