The aim of this work is to demonstrate the use of a commercial finite element package, ABAQUS EXPLICIT, to model ultrasonic guided waves in structural components. The particular application of interest is modeling the interaction of a broadband vertical bending mode with transverse-type defects in railroad tracks. This topic is part of a broader project on high-speed defect detection in rails by long-range ultrasonic inspections. Reflection coefficient spectra in the 20-45 kHz range are obtained for four different sizes and three different orientations of transverse head flaws. A preliminary study of Lamb waves in a free plate helps drawing modeling guidelines for the rail. This study is part of a larger project aimed a long-range inspection system for rails that sensitive to transverse-type flaws and that can high speeds. Finite element modeling becomes tool to predict the wave interactions with a variety that would be impractical to replicate experimentally.The reflection coefficient spectra from this variety of and orientations can then be fed to an Automatic Classification (ADC) algorithm that operates in learning mode. The first implementation using Vector Machines for ADC of transverse defects been recently demonstrated in the laboratory.
Modeling guided wave propagation with application to the long-range defect detection in railroad tracks
Modellierung der Ausbreitung geführter Wellen mit Anwendung auf den Nachweis entferntliegender Fehler in Eisenbahnschienen
NDT&E International ; 38 , 5 ; 325-334
2005
10 Seiten, 10 Bilder, 19 Quellen
Aufsatz (Zeitschrift)
Englisch
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