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6 August 2001 In-situ health monitoring of CFRP composites using electrical characteristics
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The increase in electrical resistance of Carbon Fiber Reinforced Plastic (CFRP) composites caused by mechanical damage are studied experimentally and analytically. Considering the contacts of misaligned conducting carbon fibers of CFRP, we proposed a discrete network model as an equivalent electrical circuit for CFRP. This model incorporates both an electrical ineffective length, over which broken fibers carry no current, and the Weibull- Poisson statistics of fiber breakage. The model is also used to explain experimental data showing that the resistance change does not depend on the gage length of specimen and that the resistance and electrical ineffective length are controlled by the fiber volume fraction.
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Jae Boem Park, Tomonaga Okabe, Dong Yeul Song, Nobuo Takeda, and Akihiko Kitano "In-situ health monitoring of CFRP composites using electrical characteristics", Proc. SPIE 4328, Smart Structures and Materials 2001: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (6 August 2001);

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