The mechanical behavior of optical fiber sensor embedded within the composite laminate |
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| Authors: | Tae Seong Jang Jung Ju Lee Dong Chun Lee Jeung-Soo Huh |
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| Affiliation: | (1) Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Taejon, 305-701, South Korea;(2) Department of Metallurgical Engineering, Kyungpook National University, 1370 Sankyuk-dong, Taegu, 702-701, South Korea |
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| Abstract: | Mechanical behavior, such as tensile and fatigue strength, of the optical fiber sensor embedded within the composite laminate was investigated. Tensile and fatigue tests were performed to evaluate the static and fatigue characteristics of optical fibers embedded within three types of laminated composite specimens, 06/OF/06]T, 02/904/OF/904/02]T and 03/903/OF/903/03]T. The initiation of damage and fracture of the optical fiber were detected by observation of the intensity drop-off of laser signal transmitted through the optical fiber during test. Experimental results showed that the fatigue strength of optical fiber embedded within the cross-ply laminate is much lower than the fatigue strength of optical fiber within the unidirectional ply laminate. It was also found that the optical fiber embedded within unidirectional ply laminate fractured due to the fatigue damage accumulation of internal defects of optical fiber itself. However the optical fiber embedded within the cross-ply laminate fractured due to the growth of transverse matrix crack of host composite laminate. |
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