The corrosion of aeronautics structures in aluminum is difficult to detect at an early stage. Lamb waves are sometimes very sensitive to this damage and can be considered as good candidates for its detection. Unfortunately, the complex time evolution of Lamb wave signals makes difficult both utilization and interpretation of their interaction with defects. This paper presents a non-destructive, noncontact method to detect corrosion in an aluminium aircraft structure. The study of temporal signals is simplified by the use of wavelet transforms and the use of the scalogram as a dispersion curve which allows the identification of Lamb modes. It is easy, then, to observe the attenuation of some Lamb modes in a corroded area and to compare the generation of Lamb modes according to the shape of the impact of the laser excitation. More quantitatively using some small zones of the scalogram, it has been possible to make cartography of a corroded area of 0.1 mm thickness without false alarms due to thickness variations in the structure.
Hidden corrosion detection in aircraft metallic structures using Lamb waves
Nachweis versteckter Korrosion in Flugzeugmetallstrukturen mittels Lambwellen
2005
5 Seiten, 7 Bilder, 6 Quellen
Conference paper
Storage medium
English
Corrosion detection in aircraft structures using guided Lamb waves
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