• Title, Summary, Keyword: Fiber Reinforced Polymeric Composites

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Effect of Fiber Orientation on the Tensile Strength in Long-Fiber Reinforced Polymeric Composites (장섬유강화 고분자 복합재료에서 인장강도에 미치는 섬유배향의 영향)

  • Lee, Dong-Gi;Sim, Jae-Ki;Han, Gil-Young;Kim, Hyuk;Kim, Jin-Woo;Lee, Jung-Ju
    • Proceedings of the KSME Conference
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    • pp.55-60
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    • 2003
  • Case that long-fiber reinforced polymeric composites of fiber orientation situation of a direction state is J=1 that is direction of tensile strength of another state appeared highest. And theoretical tensile strength value of long-fiber reinforced polymeric composites board of fiber orientation situation of a direction state appeared similarly with tensile strength value that long-fiber reinforced polymeric composites board of fiber orientation situation of a direction state. Also, than case that efficiency of fiber orientation situation of long-fiber reinforced polymeric composites is J=1 in it is J=0.1 of fiber orientation situation effect of long-fiber reinforced polymeric composites about 60% high appear.

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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)

  • Yoon, Doo-Hyun;Jo, Seon-Hyung;Kim, E-Gon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.23 no.7
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    • pp.1075-1084
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    • 1999
  • 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.

The Effect of Mold Shapes on the Fiber Orientation of Welding Parts for Injectin Molding of Fiber Reinforced Polymeric Composites (섬유강화 고분자 복합재료의 사출성형에 있어서 웰드부의 섬유배향에 미치는 금형형상의 영향)

  • Kang, M. G.;Choi, Y. S.;Kim, H.;Lee, D. G.;Han, G. Y.;Kim, E. G.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.457-460
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    • 2000
  • Injection molding is the most widely used process for the industrial forming of plastic articles. During an injection molding process of composites, the fiber-matrix separation and fiber orientation are caused by the flow of molten polymer/fiber mixture. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separation·orientation and infection molding conditions. So far, there is no research on the measurement of fiber orientation using image processing. In this study, the effects of fiber content ratio and molding condition on the fiber orientation-angle distributions are studied experimentally. Using the image processing method, the fiber orientation distribution of welding parts in injection-molded products is assessed. And the effects of fiber content and injection mold shapes on the fiber orientation in case of fiber reinforced polymeric composites are studied. experimentally.

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Flow Analysis with Ratio of Expansional /Contractional Viscosity during Compression Molding of Continuous Fiber-Reinforced Polymeric Composites (연속섬유강화 플라스틱 복합재의 압축성형에 있어서 확대/축소 점도비를 고려한 유동해석)

  • Kim, Hyeong-Cheol;Chae, Gyeong-Cheol;Jo, Seon-Hyeong;Kim, Lee-Gon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.3
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    • pp.581-592
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    • 2000
  • To obtain an excellent product and decide on optimum molding conditions, it is important to establish the relationship between molding conditions and viscosity. The composites is treated as a pseudoplastic fluid, and the expansional/contractional viscosity of the fiber-reinforced polymeric composites is measured using the parallel plastometer, and the model for flow state has been simulated with the viscosity. The effects of expansional slip parameter $\alpha_{e}$, and expansional/contractional viscosity ratio ${\mu}_{\gamma}$, on the mold filling parameters are also discussed.

Measurement of the Fiber Orientation Distribution for Thickness direction of Injection Molded Long Fiber Reinforced Polymeric Composites (장섬유강화 플라스틱 복합재의 사출성형에 있어서 두께방향의 섬유배향 분포측정)

  • 윤성운;박진국;조선형;김이곤
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.199-204
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    • 1998
  • In this study, a method is presented which can be used to measure the fiber orientation distribution for thickness direction during injection molding using image processing. The intensity method in used for measuring the distribution. And the effects of fiber content, injection molding condictions on the orientation function are also discussed.

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Effect of Mold Temperature on the Separation and the Orientation during Compression Molding of Fiber-Reinforced Polymeric Composites (섬유강화 고분자 복합재료의 압축성형에 있어서 분리 ${\cdot}$ 배향에 미치는 금형온도의 영향)

  • Lee, Dong-Gi;Han, Gil-Young;Kim, E-Gon
    • Journal of Ocean Engineering and Technology
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    • v.9 no.2
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    • pp.123-132
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    • 1995
  • During compression molding of fiber-reinforced polymeric composites, microstructural changes such as the fiber-matrix separation and the fiber orientation are occurred by the flow of composite materials. Since the nonhomogeneity and anisotropy of composites are caused by the separation and orientation of fibers. On the other hand, the separation and the orientation of fibers are inseparably related to each other. In this paper the degree of nonhomogeneity which is a measure of the separation is obtained using one-dimensional rectangular shaped part compression molding. And the orientation function is measured by the image processing using soft X-rayed photograph and image scanner. We study effects of the mold temperature on the degree of nonhomogeneity and the orientation function.

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A Study on the Cup-Type Compression Molding for Continuous Fiber-Reinforced Poymeric Composites (연속섬유강화 플라스틱 복합재료의 컵형 압축성형성에 관한 연구)

  • 오영준;김형철;조선형;김이곤
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.176-181
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    • 1997
  • During a compression molding of continuous fiber reinforced composites, the separation of matrix and fiber is caused by the flow of the molding process. As the characteristics of the products are greatly dependent on the separation, it is very important to clarify the separation in relation to molding condition, degree of needle punching number on the degree of nonhomogeneity are studied.

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Binary Mixture Rule for Predicting the Dielectric Properties of Unidirectional E-glass/Epoxy Composite Materials (일방향 유리섬유/에폭시 복합재료의 유전성질 예측을 위한 혼합법칙)

  • Chin Woo Seok;Lee Dai Gil
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.175-179
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    • 2004
  • Since the electromagnetic properties of fiber reinforced polymeric composites can be tailored effectively by adding small amount of electromagnetic powders to the matrix of composites, they are plausible materials for fabricating the radar absorbing structures (RAS) of desired performance. In order to design the effective electromagnetic wave (EM) absorber with the fiber reinforced polymeric composites, the electromagnetic characteristics with respect to the constituents of the composite should be available in the target frequency band. In order to describe the dielectric behavior of low loss unidirectional fiber reinforced composite, theoretical models and mixture equations for estimating its dielectric constant were proposed with respect to the fiber, matrix volume fractions and fiber orientations, and verified by the experiments. From the investigation, it was found that the suggested binary mixture rules agreed well with the experimental results.

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Simulation of Compression Molding with Extensional & Shear Viscosity for Fiber-Reinforced Polymeric Composites (섬유강화 고분자 복합재료의 압축성형에 있어서 인장점성과 전단점성을 고려한 유동해석)

  • 조선형;김이곤
    • Transactions of Materials Processing
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    • v.6 no.4
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    • pp.311-318
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    • 1997
  • In recent years, compression molding of fiber-reinforced thermoplastics has been increased in commercial aspects. During a compression molding process of composites, the flow analysis must be developed in order to accurately predict the finished part properties as a function of the molding process parameters. In this paper, a new model is presented which can be used to predict the flow under consideration of the slip of mold-composites and extensional & shear viscosity ratio M and slip parameter$\alpha$ on the mold filling parameters are discussed.

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The Mechanical Property by Fiber Orientation Distributions in Fiber-Reinforced Polymeric Composites (섬유강화 고분자 복합재료에서 섬유배향상태에 따른 기계적 성질)

  • Lee, Dong-Gi;Sim, Jae-Ki;Han, Gil-Young;Kim, Hyuk;Kim, Jin-Woo;Lee, Jung-Ju
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.202-205
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    • 2003
  • Investigated whether fiber orientation situation of fiber reinforcement macromolecule composition board and the fiber inclusion rate are perpendicular and horizontal direction tensile strength and some correlation. Fiber orientation situation of tensile strength of 0 direction of composition board increased changelessly by aeolotropy in isotropy. Tensile strength of 90 direction that is isotropy and tensile strength of 0 direction that is aeolotropy agreed almost. Get into aeolotropy, the reinforcement rate of fiber decreased. When load interacts for width direction of reinforcement.

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