Détermination des contraintes internes par méthode dynamique résonante : application aux massifs revêtus

Abstract : The aim of this work is to use a new vibratory formalism in order to determine the level of internal stresses in coated materials using the dynamic resonant method. This requires the improvement of vibratory formalism, which allows to link the stress level to the variation of resonance frequency in free flexural mode. This study was conducted by doing three different approaches: numerical, analytical and experimental measurements in real coating. Numerical simulations were conducted by finite element method in static mode to determine the stress distribution in depth. Furthermore, we made other numerical simulations in dynamic mode to evaluate the effect of these static results on the resonant frequency, in comparison with those of coated material without stress. At this stage, these numerical studies let us to develop the vibratory formalism analytically. To validate this latter formalism, we applied it in a real coating for measuring the stress level and we made comparisons with results from others methods(DRX/Stoney). This confrontation (numerical-analytical/experimental measurements) found that dynamic resonant method is efficient for coated material having a thickness ratio moreimportant than 0,01.
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Mohamed Achraf Ben Dhia. Détermination des contraintes internes par méthode dynamique résonante : application aux massifs revêtus. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2016. Français. ⟨NNT : 2016ESMA0021⟩. ⟨tel-01457159⟩

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