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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 102
Edited by:
Paper 35

Detection of Defects in Rails by Means of Guided Waves

S. Teidj1, A. Khamlichi1, A. Driouach1 and E. Jacquelin2

1Systems of Communications and Detection Laboratory, Faculty of Sciences
M'hannech, Tetouan, Morocco
2University of Lyon, France
and IFSTTAR, LBMC, UMR_T9406, Bron, Université Lyon 1, Villeurbanne, France

Full Bibliographic Reference for this paper
S. Teidj, A. Khamlichi, A. Driouach, E. Jacquelin, "Detection of Defects in Rails by Means of Guided Waves", in , (Editors), "Proceedings of the Fourteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 35, 2013. doi:10.4203/ccp.102.35
Keywords: guided wives, rails, transverse-type defects, piezoelectric transducers, impact excitation.

In this paper, detection of damage in rails is investigated by using an elastic wave propagation technique. Rail modelling was performed by means of the finite element spectral method. The methodology consisted of three steps. Given some localized damage scenario, the first step was to perform a calculation of the wave propagation caused by a Laser pulse chosen to excite the rail in torsion. The response in terms of transverse section rotation rate was then obtained for a given rail location. The second step consisted of operating the Mexican hat wavelet based transform to obtain the spectrum relative to the contrast signal associated with the difference between to the undamaged and damaged signals. Detectability of defects is then discussed with respect to the time-frequency diagram as a function of the defect characteristics.

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