Caractérisation des matériaux complexes et de leurs endommagements par la technique de la coda ultrasonore alliée à l'acoustique non linéaire

Abstract : Nonlinear Resonance (NR) and Coda Wave Interferometry (CWI) have proved to be efficient to detect and follow the evolution of micro-cracks within a strongly scattering media (concrete, rocks, etc.). Nevertheless, the localization of the cracks using the same techniques is not straight forward. In order to avoid the conditioning and its subsequent relaxation effect related to NR, CWI is simultaneously applied when concrete samples are vibrating in the linear regime. Based on a comparative study of the coda signals contents (non ballistic part) in the absence and under the weak linear vibration, the localization of the mechanically induced scatterers was possible depending on the scatterers' main direction with respect to the vibration plane. The latter point raises the issue of the generated types of vibration at the scatterers. Therefore, investigations were performed using the Acoustic Emission (AE) technique, which has served to verify that the acoustic activity during the linear vibrations does change depending on the considered experimental configuration. The latter, has also a direct effect on the frequency content of the recorded AE hits showing the potential link existing between the quantitative analysis of AE hits and the generated vibration mechanisms of the existing micro-cracks.
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Souad Toumi. Caractérisation des matériaux complexes et de leurs endommagements par la technique de la coda ultrasonore alliée à l'acoustique non linéaire. Acoustique [physics.class-ph]. Université du Maine; Université des Sciences et de la Technologie Houari Boumediene (Algérie), 2017. Français. ⟨NNT : 2017LEMA1024⟩. ⟨tel-02310392⟩

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