Evaluation par ondes guidées de niveaux d'adhésion dissymétriques dans des collages structuraux métal-matériau composite. : Modélisation et approches des cas de Kissing Bonds

Abstract : This thesis focuses on the evaluation of the quality of adhesion in metal/adhesive/carbon-epox: structural assemblies used in the automotive and aerospace industry. The quality of the bonding i assessed by non-destructive methods using ultrasonic guided waves of the Lamb and SH types. A nev finite element numerical model was developed during this work: it is an interphase rheological mode that allows the dispersion curves of the guided modes to be plotted in the samples studied. It als( makes it possible to predict the evolution of the amplitude of these modes and the distribution o energy in the structure according to the level of adhesion or the presence of a kissing bond type defect. Samples with known and controlled adhesion levels are made with the help of physico chemists, 'where the epoxy is partially or totally crosslinked, and where the substrate/adhesivl interface has undergone different chemical treatments. In particular, samples are studied whos degradation of the bonding in the structure is not symmetrical. The experimental results are compare( with those from the numerical model. These results show that it is possible to characterize two clos levels of adhesion and also to determine on which interface (metal/adhesive or composite/adhesive the bonding has been degraded. The use of a measurement bench with electromagnetic acousti( transducers (EMAT) allowed thè study of the amplitude of the SH modes. Significant variations in th( amplitude of some modes have been observed when the wave passes from an area of good adhesioi to an area where the bonding is degraded.
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Latifa Attar. Evaluation par ondes guidées de niveaux d'adhésion dissymétriques dans des collages structuraux métal-matériau composite. : Modélisation et approches des cas de Kissing Bonds. Acoustique [physics.class-ph]. Normandie Université, 2019. Français. ⟨NNT : 2019NORMLH06⟩. ⟨tel-02185601⟩

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