Bonded-Patch Integrity Characterization – A Modal Resonance Approach


  1. Rinaldi, G.
  2. Genest, M.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Bonded-patch technology can be employed to either enhance the integrity or to repair damaged structures. In aerospace applications consideration must be given to the effectiveness of the bonded-patch technology to restore the performance of a given component to an acceptable level. Repair of aircraft and components is of particular importance for military air fleets due to the prolonged life-cycle of the aircraft beyond the normal design life. In this respect, a reliable and cost-effective repair technology would help to minimize costs associated with maintenance of military air fleets by offering a low cost alternative to replacing aircraft components. A fundamental drawback to the application of this technology, particularly for critical, primary structure, is the need to assure that the patch is performing as designed. Hence, the oncomponent characterization of a given bonded-patch is of vital importance in terms of assessing the integrity of the bond. Disbond or delamination associated with long-term stress cycling can adversely affect the quality of the bonded-patch. In this report, a simple and reliable method based on modal resonance is described in which the variation in the modal resonance is employed to detect and monitor the evolution of a bonded-patch disbond. For demonstration purposes the proposed method is applied to aluminum 6061-T651 beams with bonded-patch segments on their surface.

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Report Number
DRDC-ATLANTIC-TM-2009-079 — Technical Memorandum
Date of publication
01 Sep 2009
Number of Pages
Electronic Document(PDF)

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