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Étude d'une méthode d'inversion basée sur la simulation pour la caractérisation de fissures détectées par ultrasons dans un composant revêtu

Abstract : This work deals with the inversion of ultrasonic data. The industrial context of the study in the non destructive evaluation of the internal walls of French reactor pressure vessels. Those inspections aim at detecting and characterizing cracks. Ultrasonic data correspond to echographic responses obtained with a transducer acting in pulse echo mode. Cracks are detected by crack tip diffraction effect. The analysis of measured data can become difficult because of the presence of a cladding, which surface is irregular. Moreover, its constituting material differs from the one of the reactor vessel. A model-based inverse method uses simulation of propagation and of diffraction of ultrasound taking into account the irregular properties of the cladding surface, as well as the heterogeneous nature of the component. The method developed was implemented and tested on a set of representative cases. Its performances were evaluated by the analysis of experimental results. The precision obtained in the laboratory on experimental cases treated is conform with industrial expectations motivating this study.
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https://tel.archives-ouvertes.fr/tel-00007345
Contributor : Guillaume Haiat <>
Submitted on : Tuesday, November 9, 2004 - 11:20:49 AM
Last modification on : Thursday, November 5, 2020 - 1:30:30 PM
Long-term archiving on: : Thursday, September 13, 2012 - 12:40:29 PM

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  • HAL Id : tel-00007345, version 1

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Guillaume Haïat. Étude d'une méthode d'inversion basée sur la simulation pour la caractérisation de fissures détectées par ultrasons dans un composant revêtu. Acoustique [physics.class-ph]. Université Paris-Diderot - Paris VII, 2004. Français. ⟨tel-00007345⟩

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