Application of chirped fiber Bragg grating sensors for damage identification in composites

Nobuo Takeda; Yoji Okabe; Ryohei Tsuji; Shin-ichi Takeda

doi:10.1117/12.472608

27 June 2002 Application of chirped fiber Bragg grating sensors for damage identification in composites

Nobuo Takeda, Yoji Okabe, Ryohei Tsuji, Shin-ichi Takeda

Proceedings Volume 4694, Smart Structures and Materials 2002: Smart Sensor Technology and Measurement Systems; (2002) https://doi.org/10.1117/12.472608
Event: SPIE's 9th Annual International Symposium on Smart Structures and Materials, 2002, San Diego, California, United States

Abstract

Chirped fiber Bragg grating (FBG) sensors were applied for the identification of damages in carbon fiber reinforced plastic (CFRP) laminates since the reflection spectrum from a chirped FBG was expressed as a function of the position along the grating. First, for the identification of crack locations in the 90 degree(s) ply of cross-ply laminates, chirped FBG sensors, whose grating length and spectrum width were 50mm and about 5nm respectively, were embedded in CFRP cross-ply laminates, and the reflection spectra were measured after tensile loadings to the laminates. As a result, the spectra had dips corresponding to locations of transverse cracks. This change in the form of the spectrum was also confirmed by a theoretical calculation. Hence, the crack locations could be identified from the form of the spectrum. Secondly, this technique was applied to the identification of the delamination originating from a tip of a transverse crack in a cross-ply laminate. Since theoretical calculations indicated that the reflection spectrum changed its form corresponding to the progress of the delamination, it was also found that the chirped FBG sensor could be applied to the identification of the length and position of the delamination.

Citation Download Citation

Nobuo Takeda, Yoji Okabe, Ryohei Tsuji, and Shin-ichi Takeda "Application of chirped fiber Bragg grating sensors for damage identification in composites", Proc. SPIE 4694, Smart Structures and Materials 2002: Smart Sensor Technology and Measurement Systems, (27 June 2002); https://doi.org/10.1117/12.472608

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