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Proceedings Paper

Three-axis distributed fiber optic strain measurement in 3D woven composite structures
Author(s): Matt Castellucci; Sandra Klute; Evan M. Lally; Mark E. Froggatt; David Lowry
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Paper Abstract

Recent advancements in composite materials technologies have broken further from traditional designs and require advanced instrumentation and analysis capabilities. Success or failure is highly dependent on design analysis and manufacturing processes. By monitoring smart structures throughout manufacturing and service life, residual and operational stresses can be assessed and structural integrity maintained. Composite smart structures can be manufactured by integrating fiber optic sensors into existing composite materials processes such as ply layup, filament winding and three-dimensional weaving. In this work optical fiber was integrated into 3D woven composite parts at a commercial woven products manufacturing facility. The fiber was then used to monitor the structures during a VARTM manufacturing process, and subsequent static and dynamic testing. Low cost telecommunications-grade optical fiber acts as the sensor using a high resolution commercial Optical Frequency Domain Reflectometer (OFDR) system providing distributed strain measurement at spatial resolutions as low as 2mm. Strain measurements using the optical fiber sensors are correlated to resistive strain gage measurements during static structural loading.

Paper Details

Date Published: 29 March 2013
PDF: 13 pages
Proc. SPIE 8690, Industrial and Commercial Applications of Smart Structures Technologies 2013, 869006 (29 March 2013); doi: 10.1117/12.2012221
Show Author Affiliations
Matt Castellucci, Luna Innovations Inc. (United States)
Sandra Klute, Luna Innovations Inc. (United States)
Evan M. Lally, Luna Innovations Inc. (United States)
Mark E. Froggatt, Luna Innovations Inc. (United States)
David Lowry, NASA Johnson Space Ctr. (United States)

Published in SPIE Proceedings Vol. 8690:
Industrial and Commercial Applications of Smart Structures Technologies 2013
Kevin M. Farinholt; Steven F. Griffin, Editor(s)

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