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Proceedings Paper

Application of chirped FBG sensors for detection of local delamination in composite laminates
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Paper Abstract

Chirped fiber Bragg (FBG) sensors were applied for the detection of delamination in carbon fiber reinforced plastics (CFRP) cross-ply laminates. Reflection spectra from the embedded chirped FBG sensor were measured at various delamination lengths under static four-point bending test. The sensor were embedded into two different positions for the investigation of the relation between the spectrum and the direction of delamination propagation. The spectrum changed sensitively depending on both the delamination length and the direction of the delamination propagation. For confirmation of the measured results, the spectrum was simulated considering the strain distribution in the chirped FBG sensor theoretically. The change in the form of the measured spectrum was consistent with that of the calculated spectrum. Moreover, the area ratio of the two peaks in the spectrum and the spectrum width were proposed as effective indicators for the identification of the local delamination.

Paper Details

Date Published: 22 July 2003
PDF: 8 pages
Proc. SPIE 5050, Smart Structures and Materials 2003: Smart Sensor Technology and Measurement Systems, (22 July 2003); doi: 10.1117/12.484243
Show Author Affiliations
Shin-ichi Takeda, Univ. of Tokyo (Japan)
Yoji Okabe, Univ. of Tokyo (Japan)
Nobuo Takeda, Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 5050:
Smart Structures and Materials 2003: Smart Sensor Technology and Measurement Systems
Daniele Inaudi; Eric Udd, Editor(s)

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