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Analysis of Longitudinal Strains of Cross-ply Composite Laminates using A-EFPI Optical Fiber Sensor

Department of Mechanical Design, Graduate School, Hanyang University 17 Haengdang-dong, Sungdong-ku, Seoul 133-791, Korea

Nak-Sam Choi

Department of Mechanical Engineering, Hanyang University 1271 Sa-1dong, Ansan-si, Kyunggi-do 426-791, Korea, nschoi{at}hanyang.ac.kr

Il-Bum Kwon

Failure Prevention System, Korea Research Institute of Standards and Science, Daejon, 305-600, Korea

Kyong Y. Rhee

School of Mechanical and Industrial Engineering KyungHee University, Yongin 449-701, Korea

The longitudinal strains (_x) of the core and the skin layers in glass fiber reinforced plastic (GFRP) cross-ply composite laminates are analyzed using embedded optical fiber sensors (OFSs) of absolute extrinsic Fabry—Perot interferometer (A-EFPI). Foil-type strain gages (SGs) bonded on both upper and lower surfaces of a specimen are employed for comparison of the strain measurement on the surface. It has been shown that the values of _x in the interior of the skin layer and the core layer measured by embedded A-EFPI sensor are lower than those of the specimen surface measured by SGs. Experimental results agree well with those from finite element analysis based on a shear lag model. Optical microscopy observation of the damage behavior around the fiber sensor by the thin-sectioning technique shows that reinforcing glass fibers protect the OFS embedded in the 0 ^° skin layer, whereas the formation of transverse cracks in the 90 ^° core layer substantially reduces strains at the failure of OFS embedded in the core layer.

Key Words: optical fiber sensor • cross-ply composite laminates • shear lag model • transverse crack • failure.

Journal of Composite Materials, Vol. 41, No. 7, 785-800 (2007)
DOI: 10.1177/0021998306067013


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