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Proceedings Paper

Detection of patch debonding in composite repaired cracked metallic specimens, using optical fibers and sensors
Author(s): George J. Tsamasphyros; George N Kanderakis; Nikolaos K. Furnarakis; Zaira P. Marioli-Riga
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Paper Abstract

A classical cracked metallic structure repaired with a "smart" bonded composite patch has been studied, using finite element analysis, in order to determine the debonding detection capabilities of the optical network and to select the appropriate optical fibers paths and Bragg Grating sensors locations. The patch is bonded over a cracked aluminum plate, by means of a thin adhesive layer, while the primary loading axis of the metal is assumed to be parallel to the direction of the optical fibers. Different optical fiber paths and sensor positions were considered and their ability to measure the variation of the developed strain field due to the patch debonding propagation around the crack tip was studied. It was concluded that a fiber optics network is capable of evaluating the increasing debonding area around the crack tip and can provide adequate information concerning the critical parameters required for the monitoring of the structural integrity of composite patch reinforced structures (i.e. strains developed at the patch debonding boundary and position of the crack tip). At least two Bragg Grating sensors should be used at each side of the crack per optical fiber, to enable adequate monitoring of the adhesive debonding and crack propagation.

Paper Details

Date Published: 3 October 2003
PDF: 9 pages
Proc. SPIE 5145, Microsystems Engineering: Metrology and Inspection III, (3 October 2003); doi: 10.1117/12.503774
Show Author Affiliations
George J. Tsamasphyros, National Technical Univ. of Athens (Greece)
George N Kanderakis, National Technical Univ. of Athens (Greece)
Nikolaos K. Furnarakis, National Technical Univ. of Athens (Greece)
Zaira P. Marioli-Riga, Hellenic Aerospace Industry Ltd. (Greece)

Published in SPIE Proceedings Vol. 5145:
Microsystems Engineering: Metrology and Inspection III
Christophe Gorecki, Editor(s)

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