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섬유강화 플라스틱 복합재의 압축성형에 있어서 이방성과 금형-재료계면의 미끄럼을 고려한 3차원 유한요소해석
윤두현,조선형,김이곤,Yoon, Doo-Hyun,Jo, Seon-Hyung,Kim, E-Gon 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.7
The family of unidirectional continuous fiber reinforced polymeric composites are currently used in automotive bumper beams and load floors. The material properties and mechanical characteristics of the compression molded parts are determined by the curing behavior, fiber orientation and formation of knit lines, which are in turn determined by the mold filling parameters. In this paper, a new model is presented which can be used to predict the 3-dimensional flow under consideration of the slip of mold-composites and anisotropic viscosity of composites during compression molding of unidirectional fiber reinforced thermoplastics for isothermal state. The composites is treated as an incompressible Newtonian fluid. The effects of longitudinal/transverse viscosity ratio A and slip parameter $\alpha$ on the buldging phenomenon and mold filling patterns are also discussed.
GMT Sheet에서 섬유함유율 및 섬유배향이 인장강도에 미치는 영향
이정주(Jung-Ju Lee),이동기(Dong-Gi Lee),심재기(Jae-Ki Sim),조선형(Seon-Hyung Jo),김진우(Jin-Woo Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
We can say that the increasing range of the value of GMT Sheet's tensile strength in the direction of fiber orientation is getting wider as the tiber content increases. It shows that the value of GMT Sheet's tensile strength in the direction of fiber orientation 90 is similar with the value of pp's intensity when fiber orientation function is J=0.7, regardless of the tiber content. Tensile strength of GMT Sheet is affected by the fiber orientation distribution more than by the fiber content.
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