In this paper, the potential of ultrasonic surface waves for detection of surface defects in rails has been investigated. After choosing a suitable surface mode for inspection purposes and improving its excitation by using a wide transducer array, experiments were performed on rail sections containing vertical and angled gauge corner notches. Moving the probe along the rail and taking measurements at different positions allows B-scan plots to be produced which were found especially useful for correct signal interpretation. Spatial averaging performed on the data from adjacent positions was used to mimic a larger transducer which reduced the number of unwanted signals and therefore improved the signal quality. The results show that the excited waves are capable of detecting vertical and angled defects of different depths. Furthermore, it is possible to detect deep notches in clusters of shallow defects, i.e. they are not masked by shallow preceding defects. The method therefore appears promising as a screening tool for critical defects. In order to verify this potential, further studies will be carried out on specimens with clusters of angled notches and also with real RCF defects.
Excitation of surface wave modes in rails and their application for defect detection
Anregung von Oberflächenwellenmoden in Schienen und ihre Anwendung zum Fehlernachweis
2006
8 Seiten, 10 Bilder, 6 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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