| DOI | Resolve DOI: https://doi.org/10.1117/12.434184 |
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| Author | Search for: Lévesque, D.1; Search for: Massabki, M.1; Search for: Choquet, M.1; Search for: Néron, C.1; Search for: Bellinger, N. C.2; Search for: Forsyth, D.2; Search for: Chapman, C. E.2; Search for: Gould, R.2; Search for: Komorowski, J. P.2; Search for: Monchalin, J.-P.1 |
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| Affiliation | - National Research Council of Canada. NRC Industrial Materials Institute
- National Research Council of Canada. NRC Institute for Aerospace Research
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| Format | Text, Article |
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| Conference | Advanced Nondestructive Evaluation for Structural and Biological Health Monitoring, March 6-8, 2001, Newport Beach, CA, USA |
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| Subject | corrosion; inspection; joints (structural components); laser applications; maintenance; natural frequencies; numerical methods; spectroscopy; ultrasonic applications; X-rays; aircraft structure; laser ultrasonic detection; metallic lap joint structures; numerical inversion method; resonance spectroscopy; aircraft parts and equipment |
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| Abstract | Corrosion has been recognized as a serious problem in the maintenance of aging aircraft. The Industrial Materials Institute (IMI) has explored the use of laser-ultrasonics for the detection of hidden corrosion in metallic lap joint structures. For inspection with painted surfaces, IMI has shown that a resonance spectroscopy approach using a simple two-layer model can be used to determine the thickness of the paint layer and of the top metal skin. Validation of the model has been made using a test sample with a broad range of paint thickness. Once combined with a numerical inversion method, the model is used to produce a thickness map of the top metal skin from measured resonance frequencies. Results from standard samples with flat-bottom holes showed that the laser-ultrasonic technique could detect metal loss below 1%. The reliability of the method was also demonstrated on accelerated corrosion samples. Comparison to X-ray images showed that the laser-ultrasonic method presented a thickness map that had the same accuracy as the X-ray system without the need for dismantling the sample. These results indicated that laser-ultrasonics could be a useful tool not only to inspect aircraft during routine maintenance but also to provide valuable data in the study of corrosion inception and growth in lap joint structures. |
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| Publication date | 2001-07-24 |
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| Publisher | SPIE |
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| In | |
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| Series | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21275962 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 7d3a8273-d1b3-4cfe-98ae-1bace087b9fd |
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| Record created | 2015-08-21 |
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| Record modified | 2020-03-27 |
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