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Prédiction modale du rayonnement d’ondes élastiques guidées par une source quelconque dans une structure fine - application au contrôle non destructif

Abstract : This thesis focuses on the modelling of the propagation of elastic guided waves (GW) in thin plate like structures for their non-destructive testing (NDT). These waves are generated by any ultrasonic transducer positioned on the surface of the piece - for example, a PZT ceramic or an EMAT. A semianalytical model, the so-called GW modal pencil model, has been developed. It is based on the geometrical acoustic approximation, which makes it particularly efficient from a numerical point-of-view and able to simulate GW propagation over long distances faster than with conventional numerical models. The displacement field is then predicted only at the points of interest. The pencil model can be used to generically deal with multiple reflections of GW on plate edges. It also takes into account plates made of either metallic (isotropic) or composite (anisotropic) materials. The plate can be curved and have continuously variable mechanical properties. The waveforms are obtained in the form of their modal decomposition, which greatly eases their interpretation. Finally, comparisons with a finite element model allow the pencil approach to be validated.
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https://tel.archives-ouvertes.fr/tel-03010823
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Submitted on : Tuesday, November 17, 2020 - 7:57:07 PM
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Jordan Barras. Prédiction modale du rayonnement d’ondes élastiques guidées par une source quelconque dans une structure fine - application au contrôle non destructif. Acoustique [physics.class-ph]. Université Paris-Saclay, 2020. Français. ⟨NNT : 2020UPASG020⟩. ⟨tel-03010823⟩

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