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압착유무에 따른 SCRIMP 성형 복합재의 기계적 특성 변화
민경식(Kyeong-Sik Min),유연호(Yeun-Ho Yu),남원상(Won-Sang Nam),김병선(Byung-sun Kim),변준형(Joon-Hyung Byun) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Among many processes for composite manufacturing, SCRIMP(Seemann Composite Resin Infusion molding Process), is widely used these days in the application of geometrically complicated and large-scale structures. In this paper, we suggest a combined process (SCRIMP+press) in order to achieve a volume fraction more than of 60%. Panels of S2-glass plain woven/phenol and E-glass DBLT/epoxy were fabricated and mechanically tested. Since SCRIMP process has a limitation of relatively low fiber volume fraction (less than 50%), it is necessary to develop a process for an increased fiber volume fraction. The test results showed that there were increases of strength and modulus for both composites, and the biggest changes were flexural strength of E-galss DBLT/Epoxy (30% increase) and flexural modulus of S2-glass plain woven/Phenol (50% increase). The main reason for increase of strength and modulus is due to the volume fraction increase and the reduction of voids.
유연호(Yeun-Ho Yu),민경식(Kyeong-Sik Min),남원상(Won-Sang Nam),변준형(Joon-Hyung Byun),엄문광(Moon-Kwang Um) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The soundness of composite materials has been tested by nondestructive methods such as X-ray, C-scan, AE (Acoustic Emission), etc. but these testings are not suitable for composite structures in operation. Recently, optical fiber sensors are widely used for monitoring of curing, distortion, and damage of composite materials. When optical fiber sensors are embedded in composite materials, however, they can affect mechanical properties because of the langer diameter of sensors compared to reinforcing fibers. In this study, effects of embedded optical fiber sensors on mechanical properties of composite materials are identified. The result of tensile, compression and flexural properties in both cases of with and without optical fibers are reported.