Laser-ultrasonic detection of hidden corrosion in aircraft structure

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Laser-ultrasonic detection of hidden corrosion in aircraft structure

Levesque, D. / Massabki, M. / Choquet, M. / Neron, C. / Bellinger, N.C. / Forsyth, D. / Chapman, C.E. / Gould, R. / Komorowski, J.P. / Monchalin, J.P.

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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Dokumentinformationen

Titel :

Laser-ultrasonic detection of hidden corrosion in aircraft structure

Weitere Titelangaben:

Nachweis versteckter Korrosion in Luftfahrtkomponenten mittels Laser-Ultraschall

Beteiligte:

Levesque, D. (Autor:in) / Massabki, M. (Autor:in) / Choquet, M. (Autor:in) / Neron, C. (Autor:in) / Bellinger, N.C. (Autor:in) / Forsyth, D. (Autor:in) / Chapman, C.E. (Autor:in) / Gould, R. (Autor:in) / Komorowski, J.P. (Autor:in) / Monchalin, J.P. (Autor:in)

Erschienen in:

Advanced Nondestructive Evaluation for Structural and Biological Health Monitoring, 2001 ; 280-289

Proceedings of the SPIE - The International Society for Optical Engineering ; 4335

Erscheinungsdatum :

2001

Format / Umfang :

10 Seiten, 10 Quellen

ISSN :

0277-786X

DOI :

https://doi.org/10.1117/12.434184

Medientyp :