Nonlinear Coda Wave Interferometry: Sensitivity to wave-induced material property changes analyzed via numerical simulations in 2D - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Ultrasonics Année : 2019

Nonlinear Coda Wave Interferometry: Sensitivity to wave-induced material property changes analyzed via numerical simulations in 2D

(1) , (1) , (1) , (2) , (3) , (3)
1
2
3

Résumé

The numerical studies conducted in this paper are based on our previous research (Chen et al., 2017); through use of the spectral element method, parametric sensitivity studies of Nonlinear Coda Wave Interferometry (NCWI) are established here and divided into two parts. In the first part, CWI observables are found to be proportional to the product of the changes in elastic modulus within the Effective Damaged Zone (EDZ) and the EDZ surface area. The modifications to intrinsic properties are quantified via an overall wave velocity variation, as probed by a reverberated coda wave. However, for high-level changes, CWI may fail due to meaningless decorrelation values. In this context, parametric studies are conducted to yield a maximum range for EDZ contrast and area. To further validate these observations using a more realistic numerical model, instead of introducing a homogeneous EDZ model, the second part of this paper adds random cracks with random orientations into the EDZ of a material sample. The influence of a strong pump wave on localized nonlinear damage is reestablished; results show that the cracks added into the EDZ reduce the property changes required to match the previous experimental dataset.
Fichier principal
Vignette du fichier
UChen2019.pdf (890.43 Ko) Télécharger le fichier
Origine : Accord explicite pour ce dépôt
Loading...

Dates et versions

hal-02325871 , version 1 (08-04-2020)

Identifiants

Citer

Guangzhi Chen, Damien Pageot, Odile Abraham, Yuxiang Zhang, Mathieu Chekroum, et al.. Nonlinear Coda Wave Interferometry: Sensitivity to wave-induced material property changes analyzed via numerical simulations in 2D. Ultrasonics, 2019, 99, pp.105968. ⟨10.1016/j.ultras.2019.105968⟩. ⟨hal-02325871⟩
41 Consultations
189 Téléchargements

Altmetric

Partager

Gmail Facebook Twitter LinkedIn More