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Proceedings Paper

Miniature multiplexed fiber-grating-array sensor for the interrogation of localized strain patterns during crack growth studies upon hybrid laminate panels
Author(s): John P. Dakin; Timothy S. P. Austin; Peter J. Gregson; Daniel J. Guerrier; Keith J. Trundle
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Paper 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.

Paper Details

Date Published: 3 February 1999
PDF: 8 pages
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
Show Author Affiliations
John P. Dakin, Univ. of Southampton (United Kingdom)
Timothy S. P. Austin, Univ. of Southampton (United Kingdom)
Peter J. Gregson, Univ. of Southampton (United Kingdom)
Daniel J. Guerrier, Univ. of Southampton (United Kingdom)
Keith J. Trundle, Univ. of Southampton (United Kingdom)


Published in SPIE Proceedings Vol. 3541:
Fiber Optic and Laser Sensors and Applications; Including Distributed and Multiplexed Fiber Optic Sensors VII
Alan D. Kersey; John P. Dakin; John P. Dakin; Alan D. Kersey; Dilip K. Paul, Editor(s)

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