3 February 1999 Miniature multiplexed fiber-grating-array sensor for the interrogation of localized strain patterns during crack growth studies upon hybrid laminate panels
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Abstract
As part of a project to optimize hybrid laminates for resistance to fatigue failure, arrays of fiber Bragg gratings are being used to monitor small-scale strain perturbations in composite materials. A remote multiplexed sensing system with 40 remote sensing sties using fiber optic technology, has been developed to monitor the strain field developed across the composite lamina of a hybrid laminate in the vicinity of a fatigue crack. Developed primarily for fatigue-critical aerospace applications, i.e. fuselage and lower wing skins, the hybrid laminates are orthotropic materials having lower density and higher strength than a simple alloy monolith without reinforcement. Fatigue crack growth in hybrid laminates is a complex process that involves a combination of delamination and fiber bridging. The fiber optic system has been applied to the problem of characterizing delamination zone development about a fatigue crack, initiated at a through-thickness fastener hole.
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John P. Dakin, Timothy S. P. Austin, Peter J. Gregson, Daniel J. Guerrier, Keith J. Trundle, "Miniature multiplexed fiber-grating-array sensor for the interrogation of localized strain patterns during crack growth studies upon hybrid laminate panels", Proc. SPIE 3541, Fiber Optic and Laser Sensors and Applications; Including Distributed and Multiplexed Fiber Optic Sensors VII, (3 February 1999); doi: 10.1117/12.339100; https://doi.org/10.1117/12.339100
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