Miniature multiplexed fiber-grating-array sensor for the interrogation of localized strain patterns during crack growth studies upon hybrid laminate panels

John P. Dakin; Timothy S. P. Austin; Peter J. Gregson; Daniel J. Guerrier; Keith J. Trundle

doi:10.1117/12.339100

3 February 1999 Miniature multiplexed fiber-grating-array sensor for the interrogation of localized strain patterns during crack growth studies upon hybrid laminate panels

John P. Dakin, Timothy S. P. Austin, Peter J. Gregson, Daniel J. Guerrier, Keith J. Trundle

Author Affiliations +

Proceedings Volume 3541, Fiber Optic and Laser Sensors and Applications; Including Distributed and Multiplexed Fiber Optic Sensors VII; (1999) https://doi.org/10.1117/12.339100
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

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.

Citation Download Citation

John P. Dakin, Timothy S. P. Austin, Peter J. Gregson, Daniel J. Guerrier, and 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); https://doi.org/10.1117/12.339100

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