Aircraft structures subject to service loads and chemical environments develop structural weaknesses like cracks, corrosion etc. In order to mitigate the resulting reduction in the useful service life of aircrafts, repairs are done in the form of adhesively bonding plates e.g. titanium, plates bonded to aluminum fuselage. Typical of adhesive joints, these bonded repair patches also have interfacial (adhesive) or bulk (cohesive) weaknesses in the joint. Nondestructive inspection of these structures is required to ensure the quality of the repair patches. A systematic approach for the inspection of adhesive repair patches is demonstrated in this work. Among the multiple mode and frequency combination possible in a structure, defect sensitive guided wave modes were selected from theoretical studies and verified successfully on epoxy bonded titanium-aluminum samples with simulated adhesive and cohesive weaknesses.
Inspection of bonded repair patches in aircraft using ultrasonic guided waves
Prüfung geklebter Reparaturflicken in der Luftfahrt mittels geführter Schallwellen
2009
3 Seiten, 4 Bilder, 6 Quellen
Conference paper
English
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