• 제목/요약/키워드: Polymer Material

검색결과 2,948건 처리시간 0.031초

폴리머 침투콘크리트 보의 거동 (Behavior of Polymer-Impregnated Concrete Beams)

  • 변근주;이상민;유동우;이용진
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1992년도 봄 학술발표회 논문집
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    • pp.67-73
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    • 1992
  • Polymer-Impregnated Concrete(PIC) is a new polymer-concrete composite material which consist of basic cement concrete and polymer. The mechanical properties and behavior of PIC depend on the type of polymers and the impregnation techniques. In general, the polymer impregnation can improve the strength, durability and ductility of normal concrete. The objective of this study is to develop the analytical procedure for analyzing the structural responces of polymer-impregnated concrete beams with different polymer loading by using finite element method on the basis of experimental results.

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탄소섬유그리드 보강 휨부재의 거동에 대한 실험적 연구 (An Experimental Study on the Behavior of Carbon Fiber Grid Reinforced Flexural Members)

  • 박제용;안동준;정상균;윤순종
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 1999년도 추계학술발표대회 논문집
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    • pp.154-159
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    • 1999
  • In this paper we present tile results of an experimental investigation on the physical and mechanical properties of carbon fiber grid, polymer mortar, and carbon fiber grid reinforced plain concrete flexural members. In order to repairing and reinforcing damaged and/or deteriorated existing concrete structural members, new materials have been developed and utilized in the construction industries. But the physical and mechanical behaviors of the material are not well understood. To use the material effectively various aspects of the material must be throughly investigated analytically as well as experimentally. In this investigation we found the physical and mechanical properties of carbon fiber grid and polymer mortar which are directly utilized in the repair and reinforcement design of damaged or deteriorated concrete structures. In addition, we also investigate the strengthening effect of carbon fiber grid on the plain concrete flexural test specimens. It was found that the material can be used to repair and strengthen the concrete structures effectively.

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고분자 기판의 휨 스트레스에 대한 Encapsulation층의 효과 (The Effect of Encapsulation Layer Incorporated into Polymer Substrates for Bending Stress)

  • 박준백;서대식;이상극;이준웅;김영훈;문대규;한정인
    • 한국전기전자재료학회논문지
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    • 제17권4호
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    • pp.443-447
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    • 2004
  • In this study, we investigated the necessity of encapsulation layer to maximize flexibility of brittle indium-tin-oxide (ITO) on polymer substrates. And, Young's modulus (E) of encapsulation layer han a significant effect on external bending stress and the coefficient of thermal expansion (CTE) of that han a significant effect on internal thermal stress. To compare the magnitude of total mechanical stress including both bending stress and thermal stress, the mechanical stress of triple-layer structure (substrate / ITO / encapsulation layer or substrate / buffer layer / ITO) can be quantified and numerically analyzed through the farthest cracked island position. As a result, it should be noted that multi-layer structures with more elastic encapsulation material have small mechanical stress compared to that of buffer and encapsulation structure of large Young's modulus material when they were externally bent.

고분자 일렉트렛트의 전위분포 시뮬레이션 (Simulation of Electrostaticc Contour un Polymer Electret)

  • 이수길;김성렬;이한성;이준웅
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1995년도 추계학술대회 논문집
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    • pp.317-319
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    • 1995
  • In this Study, The Electrostatic Coutour Distribution in Polymer Electret Acoustic Sensor is calcuated using Finite Element Method. As a result the Electrostatic Countour Distribution is visualized and the design modification could be processed.

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18kV 배전용 피뢰기의 구조에 따른 온도특성 (Temperature Characteristics with Structure of 18kV Lightning Arresters for Distribution System)

  • 조한구;윤한수;이운용;김석수;최인혁
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.2
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    • pp.1125-1128
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    • 2004
  • This paper presents the temperature characteristics with structure of 18 kV lightning arresters for distribution. Three types of polymer arresters were fabricated and ceramic type arrester was also ready to investigate. Below $100^{\circ}C$, three types of polymer arresters exhibited almost the same leakage current value, but above $100^{\circ}C$, polymer arrester that arrester module was injected into polymer housing with grease exhibited the highest leakage current and the arrester with the lowest leakage current was the arrester that silicon rubber was directly injected to arrester module. The rising of leakage current of polymer arrester with grease was because of existing grease between FRP winding and silicon housing, and reducing the insulation characteristics of the grease. All polymer arresters exhibited the same temperature characteristics but ceramic typr arrester was slower than polymer arrester in heat emission despite lowest leakage current. It was thought that the air layer between ZnO varistor blocks and ceramic housing prevented the heat emission. However, in spite of the difference of the structure, the variation of the surface temperature of all arresters exhibited the same result.

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