In this paper, the basic properties of ultrasonic surface waves in rails at frequencies around 250 kHz have been investigated. Initial experiments using a Rayleigh wave probe revealed multiple signals and amplitude modulation of the excited waves. Because of this complex behavior, it was found that surface waves in rails at frequencies around 250 kHz should be considered as the superposition of multiple modes rather than as ideal Rayleigh waves. A finite element method using a reduced cross-section model of the rail was used to generate dispersion curves and mode shapes for the rail. Excitability considerations made it possible to focus on dominant surface modes. Having established the validity of the model, the most suitable surface mode for inspection purposes has been identified. Additionally, preliminary experimental results of the interaction with a simple defect have been presented. Future work will involve the development of a wider probe to improve the excitation and more studies on defect interaction.
The potential of ultrasonic surface waves for rail inspection
Anwendung von Oberflächen-Ultraschallwellen für die Schienenprüfung
2005
8 Seiten, 11 Bilder, 9 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Rail defect detection using ultrasonic surface waves
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