Three-Dimensional Flow Analysis for Compression Molding of Unidirectional Fiber-Reinforced Polymeric Composites with Slip Between Mold and Material

섬유강화 플라스틱 복합재의 압축성형에 있어서 이방성과 금형-재료계면의 미끄럼을 고려한 3차원 유한요소해석

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.