INTERNAL THERMAL STRAIN MEASUREMENT OF COMPOSITES WITHEMBEDDED FIBER BRAGG GRATING SENSORS

Abstract

Abstract: This paper studies the internal thermal strain measurement under the temperature range of 20~100℃ by FBG sensors embedded in the center of unidirectional (UD) laminates, and carbon fiber/epoxy plain woven laminates with the Sm125 sensor interrogator. The internal thermal strain properties of both composites under a thermal load were analyzed. The results showed that the internal thermal strains of both composites could be accurately measured using a referenced FBG sensor and the FBG sensors embedded in the center of materials under a thermal load. In addition, the thermal expansion coefficients of both composites were discussed to determine the variation behavior with the increase of temperature. Also, the internal thermal strains of both composites increase with the increasing temperature. It was also found that fabric structure affect the internal thermal strain, and at the same temperature point, the internal thermal strain of plain woven laminates is larger than that of UD laminates.

Key words: CFRP, FBG sensor, internal thermal strain

CLC Number:

TB332

JIA Wei-fang, SUN Bao-zhong. INTERNAL THERMAL STRAIN MEASUREMENT OF COMPOSITES WITHEMBEDDED FIBER BRAGG GRATING SENSORS[J]. Fiber Reinforced Plastics/Composites, 2016, 0(2): 75-78.

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