Développement de modèles asymptotiques en contrôle non destructif (CND) par ultrasons : interaction des ondes élastiques avec des irrégularités géométriques et prise en compte des ondes de tête.

Abstract : The head wave is the first arrival wave received during a TOFD (Time Of Flight Diffraction) inspection. The TOFD technique is a classical ultrasonic NDT (Non Destructive Testing) inspection method employing two piezoelectric transducers which are symmetrically placed facing each other with a constant spacing above the inspected specimen surface.The head wave propagation along an irregular entry surface is shown by a numerical study to be not only a surface propagation phenomenon, as for the plane surface case, but also involves a bulk propagation phenomenon caused by diffractions of the ultrasonic wave field on the surface irregularities.In order to model theses phenomena, a generic ray tracing method based on the generalized Fermat’s principle has been developed and establishes the effective path of any ultrasonic propagating wave in a specimen of irregular surface, notably including the effective head wave path.The diffraction phenomena evaluation by amplitude models using a ray approach allows to provide a complete simulation (time of flight, wave front and amplitude) of the head wave for numerous kinds of surface irregularity. Theoretical and experimental validations of the developed simulation tool have been carried out and have proven successful.
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Adrien Ferrand. Développement de modèles asymptotiques en contrôle non destructif (CND) par ultrasons : interaction des ondes élastiques avec des irrégularités géométriques et prise en compte des ondes de tête.. Mécanique [physics]. Université de Bordeaux, 2014. Français. ⟨NNT : 2014BORD0395⟩. ⟨tel-01187173⟩

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