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일방향 섬유강화 플라스틱 복합재의 점도에 미치는 성형인자의 영향
조선형,안종윤,윤성운 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.6
The Compression molding process is widely used in the automotive industry to produce parts that are large, thin, light-weight, strong and stiff. Compression molded parts are formed by squeezing a glass fiber reinforced polypropylene sheet, known as glass mat thermoplastic(GMT), between two heated cavity surfaces. In this study, the an isotropic viscosity of the Unidirectional Fiber-Reinforced Plastic Composites is measured using the parallel plastometer and the composites is treated as an incompressible Newtonian fluid. The effects of molding parameter and fiber contents ratio on longitudinal/transverse viscosity are also discussed.
조선형,안종윤,이국웅,윤성운 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.2
During a compression molding process of Unidirectional Fiber Reinforced Thermoplastic Composites, control of filling patterns in mold and distribution of fiber is needed to predict the effects of molding parameters on the flow characteristics. To obtain an excellent product and decide optimum molding conditions, it is important to know the relationship between molding conditions and viscosity. In this study, the anisotropic viscosity of the Unidirectional Fiber-Reinforced Polymeric Composites is measured by using the parallel plastometer. The model for flow state has been simulated by using the viscosity. The composites is treated as an incompressible New-tonian fluid. The effects of longitudinal transverse viscosity ratio A and slip parameter α on buldging phenomenon and mold filling patterns, are also discussed.
장섬유강화 고분자 복합판의 프레스 성형에 있어서 니트라인에 관한 연구
조선형,이국웅,안종윤,윤성운 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.2
In recent years, compression molding of lone fiber-reinforced thermoplastics has been increased in commercial aspects. In the process of compression molding of composites, the flow analysis must he developed in order to accurately predict the finished part properties as a function of the molding process parameters. In this model FRTP is assumed to be nonisothermal fluid, which has different viscosities in extensional and in shear. For verification of the model, the formation of a knit line in the L-shaped parts is compared with that of experiments results. In this paper we will discuss the effects of extensional & shears viscosity ratio ξ and slip parameter α on the other mold fill-ing parameters