Comparison of numerical and effective-medium modeling of porosity in layered media

In this study, modeling approaches for porosity in layered media are presented and compared. First, an effective-medium model is used to account for the frequency-dependent attenuation of the elastic waves. The effective-medium model is based on a single-scattering approach, i.e, it neglects multipl...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2015-06, Vol.62 (6), p.1086-1094
Main Authors: Veres, Istvan A., Smith, Robert A., Pinfield, Valerie J.
Format: Article
Language:English
Subjects:
Acoustics
Attenuation
Finite element analysis
Laminates
Numerical models
Scattering
Solid modeling
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Summary:In this study, modeling approaches for porosity in layered media are presented and compared. First, an effective-medium model is used to account for the frequency-dependent attenuation of the elastic waves. The effective-medium model is based on a single-scattering approach, i.e, it neglects multiple-scattering effects. Then, the effective-medium model is compared in time-domain finite element simulations. The numerical model allows the study of the scattering of the elastic waves on randomly distributed spherical cavities and also accounts for multiple-scattering effects. The models are compared to investigate the validity of the effective-medium model approach. The calculated reflected laminate responses and transmission spectra from the two models show a good agreement.
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2014.006837