MATEC Web Conf.
Volume 191, 20181st International Conference on Non-Destructive Evaluation of Composite Structures (NDECS 2017)
|Number of page(s)||4|
|Published online||10 August 2018|
Reliability of rail transverse flaw detection by means of an embedded ultrasonic based device
Faculty of Sciences, Systems of Communication and Detection Laboratory, Department of Physics, 93000 Tetouan, Morocco
2 National School of Applied Sciences, Industrial and Civil Engineering Department, 93000 Tetouan, Morocco
Corresponding author : firstname.lastname@example.org
The main causes of train derailment are related to rail defects such as head surface defects, horizontal defects, vertical longitudinal split defects, star cracks at colt holes and diagonal crack in web. The most adverse form of these defects consists of transverse flaws that are either opened or internal. These flaws are developed generally in a plane which is orthogonal to the rail direction. Detection of these defects is essential in order to improve security of rail roads and to prevent catastrophic failures. Most of the inspection techniques of rails relay on eddy currents, electromagnetic induction and ultrasounds. Unlike some conventional inspection tests based on contact excitation probes that roll on the rail head, this work deals with theoretical analysis of an integrated contact-less system based on ultrasound waves. Generation of these waves was performed by using a non-ablative laser source. A rotational laser vibrometer was used to perform reception of the echoes. Through finite element modelling of the rail system under specific ultrasound excitation of the rail head, detection of transverse rail flaws was studied. Reliability of defect detection was then assessed by considering various sources of perturbations.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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