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

Shin-ichi Takeda; Yoji Okabe; Nobuo Takeda

doi:10.1117/12.484243

22 July 2003 Application of chirped FBG sensors for detection of local delamination in composite laminates

Shin-ichi Takeda, Yoji Okabe, Nobuo Takeda

Proceedings Volume 5050, Smart Structures and Materials 2003: Smart Sensor Technology and Measurement Systems; (2003) https://doi.org/10.1117/12.484243
Event: Smart Structures and Materials, 2003, San Diego, California, United States

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.

Citation Download Citation

Shin-ichi Takeda, Yoji Okabe, and Nobuo Takeda "Application of chirped FBG sensors for detection of local delamination in composite laminates", Proc. SPIE 5050, Smart Structures and Materials 2003: Smart Sensor Technology and Measurement Systems, (22 July 2003); https://doi.org/10.1117/12.484243

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