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Modelling of attenuation of lamb waves using rayleigh damping: Numerical and experimental studies
Published in Elsevier Ltd
2011
Volume: 93
   
Issue: 8
Pages: 2020 - 2025
Abstract
In this study, the Lamb mode attenuation constants were derived in terms of the attenuation coefficient, group velocity and central frequency of excitation of the Lamb mode, using the Rayleigh damping model. Attenuation of Lamb waves, both fundamental symmetric and anti-symmetric modes, propagating through viscoelastic media (cross-ply glass/epoxy laminate) was modelled using the Finite Element Method. Numerically simulated attenuation of Lamb waves using Lamb mode attenuation constants was found to be in good agreement with the assumed attenuation. Experiments were performed on a quasi-isotropic laminate, employing air-coupled ultrasonic transducers, to measure the attenuation coefficient. Lamb mode attenuation constants, computed using the attenuation coefficient, were used to model the attenuation of the Lamb mode in quasi-isotropic laminates. Numerically simulated amplitude variation was found to be in good agreement with that computed from experiments. © 2011 Elsevier Ltd.
About the journal
JournalData powered by TypesetComposite Structures
PublisherData powered by TypesetElsevier Ltd
ISSN02638223
Open AccessNo
Concepts (16)
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    Damping
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    Laminated composites
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    Laminates
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    Surface waves
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    Transducers
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    Ultrasonic transducers
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    Ultrasonic waves
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    AIR-COUPLED
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    AIR-COUPLED ULTRASONIC TRANSDUCER
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    Attenuation
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    ATTENUATION COEFFICIENT
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    Numerical and experimental study
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    QUASIISOTROPIC LAMINATES
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    RAYLEIGH DAMPING
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    RAYLEIGH DAMPING MODEL
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    Finite element method