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High speed detection and characterization of defects in the railhead
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Edwards, R. S. (Rachel S.), Fan, Yichao and Dixon, S. (2007) High speed detection and characterization of defects in the railhead. In: 33rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Portland, Oregon, 30 Jul - 4 Aug 2006. Published in: Review of Progress in Quantitative Nondestructive Evaluation, Vols 26A and 26B, Volume 894 pp. 1406-1412. ISBN 9780735403994. doi:10.1063/1.2718131 ISSN 0094-243X.
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Official URL: http://dx.doi.org/10.1063/1.2718131
Abstract
In the UK, changing usage patterns for the rail network mean that rolling contact fatigue (RCF) in the railhead is an increasingly urgent problem. Current ultrasonic testing techniques have limitations in terms of testing speed and ability to reliably detect such defects. A different approach to the problem is to use ultrasonic surface waves generated and detected in a pitch-catch manner, thus simplifying the probe to detect surface defects such as RCF and to ignore deeper bulk defects. By using a pitch-catch configuration several of the speed limitations are removed; the probes are free to move as soon as each signal has been generated, without the need to wait for detection of the signal, and separation of the probes can be increased to allow for limited pulse repetition rates. Better reliability of detection for surface defects is also found, with the transmitted signal being dominated by the deepest surface-breaking defect present between the probes. We present details of a new high speed system, consisting of several electro-magnetic acoustic transducers (EMATs) to generate and detect the signals, with a high speed A-D system which has the ability to detect window and FFT time signals and analyse the FFT to give a cut-off frequency within 1 ms, giving a depth for any defects present between the probes.
| Item Type: | Conference Item (Paper) | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Series Name: | AIP Conference Proceedings | ||||
| Journal or Publication Title: | Review of Progress in Quantitative Nondestructive Evaluation, Vols 26A and 26B | ||||
| Publisher: | American Institute of Physics | ||||
| ISBN: | 9780735403994 | ||||
| ISSN: | 0094-243X | ||||
| Editor: | Thompson, D. O. and Chimenti, D. E. | ||||
| Official Date: | 2007 | ||||
| Dates: |
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| Volume: | Volume 894 | ||||
| Number of Pages: | 7 | ||||
| Page Range: | pp. 1406-1412 | ||||
| DOI: | 10.1063/1.2718131 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Conference Paper Type: | Paper | ||||
| Title of Event: | 33rd Annual Review of Progress in Quantitative Nondestructive Evaluation | ||||
| Type of Event: | Other | ||||
| Location of Event: | Portland, Oregon | ||||
| Date(s) of Event: | 30 Jul - 4 Aug 2006 |
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