발열 몰드가 적용된 레진 인퓨전 공법의 성형 품질 평가를 위한 광섬유 센서 적용 복합재 성형 모니터링

초록

Composite materials are rapidly expanding their application to various fields owing to their excellent mechanical, electrical, and thermal performance. However, the high molding cost of composite materials compared with that of existing metal materials acts as an obstacle to the spread of composite materials, and various methods are being newly developed to improve it. In general, composite materials applied to interior parts for railway vehicles are produced in the form of a laminate panel using a vacuum thermoforming method. Because the vacuum thermoforming method uses a prepreg, an expensive material mixed with glass fiber and resin, the resin infusion method that directly injects resin into the glass fiber fabric, which is the raw material, has been suggested in prior studies to reduce material costs. However, even in the case of the resin infusion method, a facility such as a thermal chamber is essential for curing the resin; therefore, this study presents a new molding method that has improved it. Specifically, by applying a large-area planar heating element to the mold on which the fabric is laminated to give the mold a heating function, molding through direct heating of the mold in a room temperature environment is possible. Therefore, a new molding method that does not require a thermal chamber was proposed. In addition, to evaluate the molding quality of the presented method, cure monitoring using fiber Bragg grating sensors was performed, and the difference in molding quaility with the existing method was compared and analyzed.

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