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3 October 2003 Detection of patch debonding in composite repaired cracked metallic specimens, using optical fibers and sensors
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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.
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George J. Tsamasphyros, George N Kanderakis, Nikolaos K. Furnarakis, and Zaira P. Marioli-Riga "Detection of patch debonding in composite repaired cracked metallic specimens, using optical fibers and sensors", Proc. SPIE 5145, Microsystems Engineering: Metrology and Inspection III, (3 October 2003);

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