• Title, Summary, Keyword: Composites

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The Effect of the Shape of the Precured CIIR on the Physical Properties of the BR/CIIR Composites

  • Pyo, Kyeongdeok;Park, Chacheol
    • Elastomers and Composites
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    • v.50 no.4
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    • pp.258-264
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    • 2015
  • Rubber composites were prepared by precured CIIR pulverized at knead shear force in order to research the effects of the BR/PCP composites. The particle size of domain in BR/CIIR composites was decreased and homogeneously dispersed by the precured CIIR pulverized. However, it was difficult to use the product when the content is 40 phr and precured of 40%. BR/PCP composites have improved mechanical properies as compared that of the addition of simply cut chip composite.

Overview of Hydrolysis : A Review Part II- Hydrolysis Application

  • Kim, Kwang-Jea
    • Elastomers and Composites
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    • v.55 no.2
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    • pp.137-146
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    • 2020
  • Part 1 provides a theoretical introduction of the hydrolysis mechanism, while Part 2 introduces other types of reaction mechanisms after hydrolysis in elastomer and PA66 composites. We reviewed the condensation reaction, which occurs after hydrolysis in bi-functional alkoxy silane (TESPD & TESPT), and investigated its effects on the mechanical properties of the composites. We also reviewed activators such as zinc soap, which enhances the mechanical properties of silica-silane-filled elastomer composites. The interaction parameter of silica-silane-filled elastomer composites [αC (alpha C)] were also discussed. The effects of hydrolysis on the mechanical property changes in plastic composites were compared and reviewed.

Reinforcement of Polychloroprene by means of Silia and Glass Fiber (Silica와 Glass Fiber에 의한 Polychloroprene의 보강(補强))

  • Yoo, Chong-Sun;Paik, Nam-Chul
    • Elastomers and Composites
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    • v.23 no.3
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    • pp.223-229
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    • 1988
  • The effect of triazine thiol derivative on the physical properties of silica-polychloroprene(CR) composites and glass fiber(MGF)-CR composites was investigated. Optimum cure time of the MGF composites filled with 2-dibuthylamino-4, 6-dithiol-s-triazine(DBT) was the fastest one, while maximum torque was the best in case of the silica composites filled with s-triazine-2,4,6-trithiol(TAT) on the Oscillating Disk Rheometer(ODR) test. Stress-strain curves of the composites showed that the physical properties such as 100% modulus, 300% modulus, tensile strength of the silica composites filled with DBT was very satisfactory and the silica composites filled with TAT was higher density of crosslinking than other crosslinked elastomer. In aging properties, elastomer filled DBT and TAT were progress post-curing reaction with increasing of aging time and it have been improved the tensile strength and crosslinking density.

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An Experimental Study on the Mechanical Properties of Fiber Reinforced Cement Composites Utilizing by-Products(II) (산업부산물을 활용한 섬유보강 시멘트 복합체의 역학적 특성에 관한 실험적 연구(II))

  • 박승범;윤의식;조청휘
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.144-149
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    • 1993
  • The results of an experimental study on the manufacture and the mechanical properties of carbon fiber reinforced silica fume.cement composites and light weight fly ash.cement composites are presented in this paper. The CF reinforced silica fume.cement composites using silica fume early strength cement were prepared with Pan-derived or Pitch-derived CF, and Lt. Wt, fly ash.cement composites using fly ash, early strength cement, perlite and a small amount of foaming agent. As the test results show, the flexural strength, toughness and ductility of CF reinforced silica fume .cement composites were remarkably increased by fiber contents. Also, the manufacturing process technology of Lt. Wt. fly ash.cement composites was developed and its optimum mix proportions were proposed. And the compressive and flexural strength of the fly ash.cement composites by hot water cured were improved even more than by moist cured, but are decreased by increasing fly ash replaced ratio for cement.

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Constitutive Equations for Three Dimensional Circular Braided Glass Fiber Reinforced Composites Using Cell Modeling Method (셀 방법을 이용한 3차원 원형 브레이드 유리 섬유 강화 복합 재료의 구성 방정식)

  • 이원오;정관수
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.71-74
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    • 2003
  • The cell modeling homogenization method to derive the constitutive equation considering the microstructures of the fiber reinforced composites has been previously developed for composites with simple microstructures such as 2D plane composites and 3D rectangular shaped composites. Here, the method has been further extended for 3D circular braided composites, utilizing B-spline curves to properly describe the more complex geometry of 3D braided composites. For verification purposes, the method has been applied for orthotropic elastic properties of the 3D circular braided glass fiber reinforced composite, in particular for the tensile property. Prepregs of the specimen have been fabricated using the 3D braiding machine through RTM (resin transfer molding) with epoxy as a matrix. Experimentally measured uniaxial tensile properties agreed well with predicted values obtained fer two volume fractions.

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Fabrication of Al/Al-SiC Composites by Thermal Spray Process (용사법에 의한 Al/Al-SiC 복합재료의 제조)

  • Kim, K.T.;Kim, Y.S.
    • Journal of the Korea Society For Power System Engineering
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    • v.10 no.2
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    • pp.93-98
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    • 2006
  • Metal matrix composites(MMCs) reinforced with ceramic particulates are receiving increasing attention because their high specific strength, low coefficient of thermal expansion and excellent wear resistance. Especially, Al-based composites(AMCs) have been widely applied for the aerospace and automotive industries. Such composites are mainly fabricated by the cast, powder metallurgy and infiltration process. In this study, SiC particulate reinforced Al-based composites were fabricated by thermal spray process and their wear behavior were investigated. Composites with different spray parameter were fabricated by using flame spray apparatus. Microstructure and wear behavior of the composites were observed by scanning electron microscope(SEM) and electron probe micro-analysis(EPMA).

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Hydrolysis Resistance and Mechanical Property Changes of Glass Fiber Filled Polyketone Composites Upon Glass Fiber Concentration

  • Kim, Sung Min;Kim, Kwang-Jea
    • Elastomers and Composites
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    • v.52 no.1
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    • pp.1-8
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    • 2017
  • Hydrolysis resistance and mechanical property changes of polyketone (POK)/glass fiber (GF) composites were investigated for GF concentrations varying between 30 and 50%. The hydrolysis resistance of GF filled POK and polyamide66 (PA66, hydrolysis resistant grade) composites were compared. As shown by the experimental results, increasing the immersion time of the composites in a monoethylene glycol (MEG)/water solution at $120^{\circ}C$ had no impact or resulted in slightly decreased mechanical properties such as the tensile strength, tensile modulus, and strain at break in case of POK composites, whereas the mechanical properties of PA66 composites showed a significant drop. Increasing GF concentrations increased the tensile strength, tensile modulus, flexural strength, and flexural modulus of POK composites; however, impact strength did not show significant changes. Hydrolysis mechanisms of POK and PA66 are discussed.