• Title, Summary, Keyword: 복합소재

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Pretreatment and Dyeing of PET/spandex Knit (폴리에스테르/스판덱스 편성물의 전처리 및 염색)

  • 이병선;이권선;김성동
    • Proceedings of the Korean Fiber Society Conference
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    • pp.400-403
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    • 2002
  • 새로운 기능성을 부여하기 위하여 여러 섬유를 사용하여 만든 복합소재 직물의 개발이 많아지고 있다. 복합소재의 염색가공에 있어서의 문제점은 복합소재를 구성하고 있는 섬유들의 물성과 염색성이 상이하여 동색성을 얻기가 힘들고 염료의 상대섬유 오염에 의해 견뢰도가 저하하는 것과, 구성섬유들의 수분과 열과 장력에 대한 반응이 틀려 구김이 발생하기 쉽다는 것 둥이다. (중략)

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Study on the Prediction of Dimension Variation due to the Temperature Rises of the Composite Material and Box Beam Type Mold Steel (복합재료를 이용한 박스빔 형태 금형의 온도상승에 따른 치수 변화 예측에 관한 연구)

  • Kim, Ho-Sang;Lee, Chan-Hee;Lee, Won-Gi
    • Composites Research
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    • v.31 no.1
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    • pp.12-16
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    • 2018
  • Composite material and mold steel can be expanded differently with the temperature gradients during the forming process because their coefficients of thermal expansions are not the same. Therefore, in order to manufacture the product with accuracy, it is necessary to verify that the forming pressure on the surface of the composite material is maintained to the required level from the material supplier. In this paper, the pressure between the composite material and mold due to the temperature difference was predicted by finite element analysis and the accuracy of predicted value was verified by measuring the thermal expansions of mold steel by the ruler. The predicted value by finite element analysis is closely in agreement with one by the experiment within the required tolerance value of ${\pm}0.05mm$.

Fabricaton of PEMFC separators with conducting polymer composites by injection molding process and evaluation of moldability and electrical conductivity of the separators (전도성 복합재료를 이용한 PEMFC용 separator 사출성형 제조 및 전기전도성 평가)

  • Yoon, Yong-Hun;Lim, Seung-Hyun;Kim, Dong-Hak
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.4
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    • pp.1361-1366
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    • 2010
  • This research aims to develop polymer composites which can be used for PEMFC separators by injection molding process. Considering the moldability and stiffness, we used PPS(Poly(phenylene sulfide)) and PP(Polypropylene) as base resin. In order to improve electrical conductivity and physical properties, we chose glass fiber, carbon fiber, carbon black, and both expanded graphite and synthetic graphite. The 3 type composites are prepared for injection molding of PEMFC separators. and CAE(Computer Aided Engineering) analysis was conducted to optimize injection processing parameters(injection pressure, heat time, mold temperature etc.). We did successfully fabricate the separators by injection molding, and measure the electrical conductivity of the samples by using four point probe device. Conclusively, PP/SG/CB composite showed better both electrical conductivity and moldability than the others.

Structural Characteristics of Pultruded Composite Bridge Deck of Hollow Section (인발성형 중공단면 복합소재 교량 바닥판의 구조적 특성 분석)

  • Lee, Sung Woo;Kim, Byung Suk;Jo, Nam Hoon
    • Journal of The Korean Society of Civil Engineers
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    • v.26 no.1A
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    • pp.35-43
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    • 2006
  • In this paper, procedures and research results involved in the development of glass reinforced composite bridge deck of hollow section were presented. Laminate design for the 3 cell deck section was performed. Structural characteristics such as serviceability, strength, failure and stability for DB24 load were analytically studied through the finite element analysis for the composite deck plate girder bridge. Composite deck tube was fabricated with pultrusion and extensive tests such as flexural test, girder-connection test, barrier-connection test, compression fatigue test and flexural fatigue test were carried out to evaluate structural behavior experimentally. Also, field load test was conducted for the demonstration plate girder bridge with composite deck and requirements for the strength and serviceability were reviewed.

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Performance Evaluation of Composite Safety Barrier for Bridge by Vehicle Impact Simulation (차량 충격 시뮬레이션을 통한 복합소재 교량용 방호울타리의 성능 분석)

  • Kim, Seung-Eock;Jeon, Shin-Youl;Hong, Kab-Eui;Lee, Min-Chul
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.24 no.5
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    • pp.499-506
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    • 2011
  • In this study, the performance of composite safety barriers was evaluated through computer simulation. A composite safety barrier of SB4 grade was modeled. The MAT58 material model provided by LS-DYNA software was used to model composite material. The performance of composite material varies according to fiber, resin type, and fiber direction. Polyurethane resin and glass fiber were used. The performance of three different stacking designs was evaluated by carrying out vehicle impact simulation. The performance evaluation based on the vehicle crash manual includes the structural strength performance, the passenger protection performance, the vehicle behavior after crash, scattering of the guardrail. As the result of the finite element analysis, the barrier composed of the more transverse direction fibers shows the better performance on the impact simulation.

Photodegradation Characterization of Polyolefin Composite (폴리올레핀 복합소재의 UV 광열화 특성)

  • Weon, Jong-Il;Shin, Sei-Moon;Choi, Kil-Yeong
    • Applied Chemistry for Engineering
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    • v.20 no.5
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    • pp.511-516
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    • 2009
  • Photodegradation characteristics of polyolefin composites were studied. Thermogravimetric analysis results suggest that the polyolefin blends used in this study have different amounts of talc. The mechanical behaviors of polyolefin blends, which experienced UV-irradiation in accordance with SAE J1960, are investigated using tensile and Izod impact tests. These results show that as the UV-exposure time increases, a significant drop in the elongation at break and impact strength at a low temperature are observed. This may be explained by the decreases in elastic energy derived from the scission of polymer molecular chains and the low density of entanglement after UV- photodegradation. Scanning electron microscopy observations indicate that no crack and surface damage are observed, while the additional talc particles are exposed, on the UV-exposed surfaces. The exposure of talc particles may be responsible for the discoloration of UV-exposed polyolefin blend surface. Observation using Fourier transform infrared spectroscopy (FT-IR) confirms the presence of photodegradation on the surface of UV-exposed polyolefin blend.

A Simplified Analysis Method of GFRP Composites Deck (GFRP 복합소재 바닥판의 간편해석법)

  • Son, Byung Jik;Ji, Hyo Seon
    • Journal of Korean Society of Steel Construction
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    • v.25 no.4
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    • pp.359-368
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    • 2013
  • This paper presents a simplified analysis method using the elastic equivalent modelling not using the global finite element modelling of deck for the basic design GFRP composites deck with cellular tubes or sandwich structural type. In order to verify the validation of the simplified method ANSYS software package is used and compared the results analyzed on the global finite element modelling and the elastic equivalent modelling. And the laboratory testing by 4-point bending is conducted to compare the results based on the simplified analysis method proposed in this paper. The comparison of the results based on the analysis and the testing are discussed. It is found that the presented simplified analysis is applicable to the use in the basic design GFRP composite deck.