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Laser generation and detection for surface wave interaction with different defect geometries
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Hernández-Valle, F., Edwards, R. S. (Rachel S.), Clough, A. R., Rosli, M. H. and Dutton, B. (Ben) (2013) Laser generation and detection for surface wave interaction with different defect geometries. In: Review of progress in quantitive nondestructive evaluation, Denver, Colorado, USA, 15-20 Jul 2012. Published in: AIP Conference Proceedings, Volume 1511 (Number 324). pp. 324-329. doi:10.1063/1.4789065 ISSN 0094-243X.
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Official URL: http://dx.doi.org/10.1063/1.4789065
Abstract
The enhancement of surface waves in the near-field of a defect has been reported by several authors. It has been demonstrated that the interaction between the incident Rayleigh wave with the reflected Rayleigh wave, plus the mode-converted surface skimming longitudinal wave, explains the significant increase in signal amplitude that is encountered as a detection point approaches a smooth machined defect inclined normal to the surface. However, this is not a typical defect geometry. For example, rolling contact fatigue in rails grows at an angle to the surface, and stress corrosion cracking grows as branched defects. We present results of experimental measurements on machined slots with varied geometries, including defects which are normal or inclined to the surface, and show the effect of branched defect geometries on the wave propagation and signal enhancement. We use laser generation and detection, and compare results with finite element method (FEM) models. We also investigate frequency enhancements for angled and branched defects, to highlight further potential measurement techniques when using scanning laser detection.
| Item Type: | Conference Item (Paper) | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | AIP Conference Proceedings | ||||
| Publisher: | American Institute of Physics | ||||
| ISSN: | 0094-243X | ||||
| Official Date: | 2013 | ||||
| Dates: |
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| Volume: | Volume 1511 | ||||
| Number: | Number 324 | ||||
| Page Range: | pp. 324-329 | ||||
| DOI: | 10.1063/1.4789065 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Conference Paper Type: | Paper | ||||
| Title of Event: | Review of progress in quantitive nondestructive evaluation | ||||
| Type of Event: | Conference | ||||
| Location of Event: | Denver, Colorado, USA | ||||
| Date(s) of Event: | 15-20 Jul 2012 |
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