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Proceedings Paper

Smart patches: self-monitoring composite patches for the repair of aircraft
Author(s): Samuel David Crossley; Zaira Marioli-Riga; George Tsamasphyros; George Kanderakis; Nikos Furnarakis; Aris Ikiades; Mary Konstantaki
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Paper Abstract

Conventional aircraft repair techniques employ bolted or riveted metallic reinforcements, which frequently introduce additional stress concentrations leading to further cracking and creating areas difficult or impossible to inspect. Bonded composite repairs (“patches”) result in the elimination of stress concentrations caused by additional fastener holes, improved strength to weight ratio and present a sealed interface. This reduces even further the danger of corrosion and fretting under the repair, gives greater flexibility in design and lessens application time while lengthening fatigue life. Embedding optical fibres and sensors into the patch, and combining this with advanced data collection and processing systems, creating a so-called “smart patch”, will enable the real-time assessment of aircraft structural integrity resulting in reliable prediction of maintenance requirements for repaired structures. This paper describes the current state of the art in smart patch technology, and includes a detailed description of the measurement problem and of the work being undertaken to solve it, at both the component and system level. An analysis of typical crack behaviour, based on FE modelling is presented and this demonstrates the need for optical strain sensors having a very short gauge length. The paper discusses the advantages and limitations of very short Fibre Bragg Gratings (FBGs) in this context and also provides early experimental data from 1mm and 2mm gratings which have been fabricated for this purpose. The paper also describes the impact of the measurement and environmental constraints on the design of the FBG interrogation system and presents the results of initial trials. The work is being undertaken in the framework of a collaborative project (ACIDS) which is co-funded by the European Commission.

Paper Details

Date Published: 8 March 2004
PDF: 12 pages
Proc. SPIE 5272, Industrial and Highway Sensors Technology, (8 March 2004); doi: 10.1117/12.516911
Show Author Affiliations
Samuel David Crossley, AOS Technology, Ltd. (United Kingdom)
Zaira Marioli-Riga, Hellenic Aerospace Industries S.A. (Greece)
George Tsamasphyros, National Technical Univ. of Athens (Greece)
George Kanderakis, National Technical Univ. of Athens (Greece)
Nikos Furnarakis, National Technical Univ. of Athens (Greece)
Aris Ikiades, FORTH (Greece)
Mary Konstantaki, FORTH (Greece)


Published in SPIE Proceedings Vol. 5272:
Industrial and Highway Sensors Technology
Brian Culshaw; Samuel David Crossley; Helmut E. Knee; Michael A. Marcus; John P. Dakin, Editor(s)

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