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A thermal wave (pulse) thermography inspection technique demonstrated the ability to detect hidden subsurface exfoliation corrosion adjacent to countersunk fasteners in aircraft wing skins. In the wing skin, exfoliation corrosion is the result of the interaction between the steel fastener and the aluminum skin material in the presence of moisture. This interaction results in corrosion cracks that tend to grow parallel to the skin surface. The inspection technique developed allows rapid detection and evaluation of hidden (not visible on the surface) corrosion, which extends beyond the head of fastener countersinks in the aluminum skins.
John Prati
"Detecting hidden exfoliation corrosion in aircraft wing skins using thermography", Proc. SPIE 4020, Thermosense XXII, (30 March 2000); https://doi.org/10.1117/12.381552
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John Prati, "Detecting hidden exfoliation corrosion in aircraft wing skins using thermography," Proc. SPIE 4020, Thermosense XXII, (30 March 2000); https://doi.org/10.1117/12.381552