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

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 ultraso...

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Bibliographic Details
Published in:Applied sciences 2021-08, Vol.11 (15), p.6924
Main Authors: Yan, Guqi, Raetz, Samuel, Groby, Jean-Philippe, Duclos, Aroune, Geslain, Alan, Chigarev, Nikolay, Gusev, Vitalyi E., Tournat, Vincent
Format: Article
Language:English
Subjects:
Acoustics
Aluminum
complex dispersion curves
Fourier transforms
Lamb waves
Laplace transforms
laser ultrasonics
Lasers
Mechanical properties
Mechanics
Metal plates
non-destructive testing and evaluation
Physics
Polycrystals
Q factors
Thin plates
Ultrasonic attenuation
Ultrasonic methods
Velocity
Wave attenuation
zero-group-velocity Lamb modes
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app11156924