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Proceedings Paper

Simultaneous strain and failure sensing of composite beam using an embedded fiber optic extrinsic Fabry-Perot sensor
Author(s): Chang-Sun Hong; Chun-Gon Kim; Il-Bum Kwon; Joong-Wan Park
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Paper Abstract

The fiber optic extrinsic Fabry-Perot sensor was embedded in composite beam to sense the strain and failure of composite structures. A tensile test was performed to confirm the strain sensitivity of the fiber optic sensor embedded in composite specimens. The strain sensitivity of the extrinsic Fabry-Perot sensor showed very good agreement with the theoretical value. The bending deformation and matrix cracking were investigated through four-point bending tests of cross-ply composite beams with embedded fiber optic extrinsic Fabry-Perot sensor. The failure due to matrix cracks in the composite beam was confirmed by an edge replica method. The strain and failure signals were separated by digital filtering from the signal of fiber optic sensor. The failure instants were obviously noticeable from the failure signal obtained from the fiber optic signal by high pass filtering. The dominant failure strain of the composite beam was determined by strain signal obtained by low pass filtering.

Paper Details

Date Published: 30 May 1996
PDF: 12 pages
Proc. SPIE 2718, Smart Structures and Materials 1996: Smart Sensing, Processing, and Instrumentation, (30 May 1996); doi: 10.1117/12.240854
Show Author Affiliations
Chang-Sun Hong, Korea Advanced Institute of Science and Technology (South Korea)
Chun-Gon Kim, Korea Advanced Institute of Science and Technology (South Korea)
Il-Bum Kwon, Korea Advanced Institute of Science and Technology (South Korea)
Joong-Wan Park, Korea Advanced Institute of Science and Technology (South Korea)


Published in SPIE Proceedings Vol. 2718:
Smart Structures and Materials 1996: Smart Sensing, Processing, and Instrumentation
Kent A. Murphy; Dryver R. Huston, Editor(s)

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