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Communication dans un congrès
Numerical modeling of nonlinear modulation of coda wave interferometry in a multiple scattering medium with the presence of a localized micro-cracked zone
Abstract : The spectral element method is used to perform a parametric sensitivity study of the nonlinear coda wave interferometry (NCWI) method in a homogeneous sample with localized damage [1]. The influence of a strong pump wave on a localized nonlinear damage zone is modeled as modifications to the elastic properties of an effective damage zone (EDZ), depending on the pump wave amplitude. The local change of the elastic modulus and the attenuation coefficient have been shown to vary linearly with respect to the excitation amplitude of the pump wave as in previous experimental studies of Zhang et al. [2]. In this study, the boundary conditions of the cracks, i.e. clapping effects is taken into account in the modeling of the damaged zone. The EDZ is then modeled with random cracks of random orientations, new parametric studies are established to model the pump wave influence with two new parameters: the change of the crack length and the crack density. The numerical results reported constitute another step towards quantification and forecasting of the nonlinear acoustic response of a cracked material, which proves to be necessary for quantitative non-destructive evaluation.
https://hal-univ-lemans.archives-ouvertes.fr/hal-01872819
Contributeur : Mathieu Chekroun <>
Soumis le : mercredi 12 septembre 2018 - 15:06:57
Dernière modification le : mercredi 13 janvier 2021 - 03:03:45
Archivage à long terme le : : jeudi 13 décembre 2018 - 16:00:33
Contributeur : Mathieu Chekroun <>
Soumis le : mercredi 12 septembre 2018 - 15:06:57
Dernière modification le : mercredi 13 janvier 2021 - 03:03:45
Archivage à long terme le : : jeudi 13 décembre 2018 - 16:00:33
Fichier
QNDE_2017.pdf
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