Application de la théorie géométrique de la diffraction à la caractérisation de défauts par spectroscopie ultrasonore

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Abstract:

Application of the geometrical theory of diffraction to the case of non-destructive evaluation of materials is a recent subject. This method, when combined with ultrasonic spectroscopy, enables us to obtain the size, position and orientation of defects in materials.

Artificial defects, like grooves, slots and holes with flat bottoms, machined in cylindrical aluminium blocks are investigated.

Experimental results for frequency range from 0.8 to 4 MHz are in good agreement with the values computed from formulae of the geometrical theory of diffraction.

Sommaire

L'application de la théorie géométrique de la diffraction au contrôle non destructif des matériaux est une idée relativement recente. Cette méthode, utilisée avec les techniques de spectroscopie ultrasonore, permet de caractériser les dimensions et l'orientation de défauts de forme géométrique simple.

Pour celà on a étudié des défauts artificiels; rainures, fentes, trous à fond plat usines dans des cylindres d'aluminium.

Les résultats expérimentaux obtenus dans une bande de fréquences de 0,8 à 4 MHz sont en bon accord avec les valeurs calculées à partir des formules de la théorie géométrique de la diffraction.

Zusammenfassung

Die Anwendung der geometrischen Beugungstheorie auf die zerstörungsfreie Materialprüfung ist eine relativ neue Idee. In Verbindung mit der Ultraschall-Spektroskopie erlaubt sie die Kennzeichnung der Abmessungen und Orientierung von Fehlern einfacher Geometrie.

Hierzu wurden künstliche Fehler untersucht, nämlich Nuten, Spalten und Löcher, die in die ebene Grundfläche von Aluminiumzylindern eingebracht wurden.

Die im Frequenzbereich von 0,8 bis 4 MHz erhaltenen experimentellen Ergebnisse stimmen gut mit den Werten überein, die mit Formeln der geometrischen Beugungstheorie berechnet wurden.

Document Type: Research Article

Publication date: February 1, 1986

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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