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Prediction of the Echos of Diffraction Resulting from the Ultrasonic Beam Interaction with a Plane Flaw Prédiction des échos de diffraction provenant de l'interaction d'un faisceau ultrasonore avec un défaut plan

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The ultrasonic non-destructive testing and more particularly the characterization of material flaws requires a good knowledge of ultrasonic field interaction with flaws. The aim of this work is to model the interaction of an ultrasonic beam with a plane flaw to simulate a fatigue crack in a solid in bidimensional geometry. The model takes into account all the sequences: Emission — Propagation — Transmission through a plane interface — Interaction with the flaw — Retro-propagation towards the transducer — Reception. This model predicts the echographic signal stemming from the diffracted field by both edges of the crack in order to have profound understanding and better interpretaion of the experimental results.

Le contrôle non destructif par ultrasons, et plus particuli èrement la caractérisation de défauts, nécessite une bonne connaissance de l'interaction du champ ultrasonore avec le défaut. Le travail présenté ici a pour objet la modélisation en géométrie bidimensionnelle de l'interaction d'un faisceau ultrasonore avec un d éfaut de type plan pour simuler une fissure de fatigue obtenue par cyclage hydraulique. Le mod èle prend en compte l'ensemble des séquences: Emission - Propagation - Transmission à travers une interface plane - Interaction avec un d éfaut plan - Rétropropagation vers le transducteur - Réception. Ce modèle permet de prédire le signal échographique issu du champ diffracté par les deux bords de la fissure afin de mieux comprendre et progresser dans l'interpr étation des résultats expérimentaux.
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Language: French

Document Type: Research Article

Publication date: July 1, 2001

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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