NDLI: A Proposed Approach for Certification of Bonded Composite Repairs to Flight-Critical Airframe Structure

Content Provider	Springer Nature Link
Author	Baker, Alan A.
Copyright Year	2010
Abstract	This paper focuses on the difficult issue of the certification of adhesively bonded repairs in applications where credit has to be given to the patch for restoring residual strength in flight-critical structure. The scope of the paper includes both adhesively bonded composite repairs to composite components and composite repairs to metallic components. After discussing typical bonded repairs and, as a baseline, procedures currently used to certify new structure, a proposal is made which may constitute an acceptable basis for the structural certification of repairs. The key requirement is to demonstrate an acceptably low probability of patch disbonding during the remaining life of the structure. The focus is on one-off repairs where development of a comprehensive certification procedure based even on limited testing will be infeasible: Firstly, a decision process is undertaken to establish if there is indeed a certification issue. That is situations where flight safety depends on the structural integrity of the repair patch. Secondly, especially if there is a certification issue, a rigorous repair design approach is undertaken, based on a generic data base previously obtained from the testing of bonded joints representing the critical regions in the repair. Thirdly, the actual repair system is validated to ensure the required strength and potential durability has been achieved. This includes Boeing wedge testing, a proven quality control procedure for the adhesive bonding process. Finally, if this approach is considered inadequate then the option is to include proof testing and/or structural health monitoring for assessment of the actual through life structural integrity of the repair system; however, this would only be feasible for special cases where the considerable extra cost and complication can be justified.
Starting Page	337
Ending Page	369
Page Count	33
File Format	PDF
ISSN	0929189X
Journal	Applied Composite Materials
Volume Number	18
Issue Number	4
e-ISSN	15734897
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-09-04
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bonded repairs Aircraft Debonding Fatigue Structural health monitoring Industrial Chemistry/Chemical Engineering Mechanics Polymer Sciences Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites

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