Abstract

Corrosion has been recognized to be a serious problem for the aging aircraft fleet currently in operation. In this work, laser-ultrasonics is shown to be a promising technique for the rapid and quantitative evaluation of corrosion in lap joints. By analyzing the broadband laser-ultrasonic signal obtained on a lap joint, we show that bonded areas can be discriminated from disbonded areas, which could be affected by corrosion. In the disbonded areas, corrosion thinning is evaluated by monitoring, in the frequency domain, the position of a resonant peak. Using a specimen simulating material loss, we show that an accuracy of 1% in the thickness determination is feasible.

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