• 제목/요약/키워드: pultrusion

검색결과 85건 처리시간 0.029초

Pultrusion 복합 샌드위치 패널의 신뢰성 평가 (Reliability Evaluation on Pultrusion Composite Sandwich Panel)

  • 이학성;김은성;오제하;김동기;이주영;강신재
    • 한국생산제조학회지
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    • 제22권3호
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    • pp.414-420
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    • 2013
  • Research on decreasing the weight of composite sandwich panels is in progress. This paper reports the experimental results for the mechanical behavior of a composite sandwich panel. The skins of sandwich panels were made of glass fiber sheets and plywood matrix composites. Their interior layers consisted of glass fiber pultrusion pipes and gold foam. Experimental tests were performed to obtain the mechanical properties and complex mechanical behavior. Before fatigue tests, tensile tests and 3-point bending tests were carried out to obtain the optimal design and determine their strength and failure mechanisms in the flat-wise position. After the static test, a fatigue test were conducted at a load frequency of 5 Hz, stress ratio (R) of 0.1, and endurance limit for the S-N curve. It showed that the failure modes were related to both the core design and skin failure.

필라멘트 와인딩과 인발성헝 제작 복합소재 교량 바닥판의 휨 특성 비교분석 (Comparative Study on the Flexural Characteristics of Composite Bridge Deck Fabricated with Filament Winding and Pultrusion)

  • 이성우
    • 한국전산구조공학회논문집
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    • 제18권2호
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    • pp.191-200
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    • 2005
  • 본 논문에서는 유리섬유 복합소재 교랑 바닥판 개발에 필요한 기초 자료를 마련하기 위하여, 필라멘트 와인딩공정과 인발성형공정으로 제작된 복합소재 교량 바닥판에 대해 휨시험과 구조해석을 실시하여, 휨특성을 비교$\cdot$분석하였다. 필라멘트 와인딩으로 제작된 삼각형 형상의 복합소재 교량 바닥판의 성능을 비교하기 위하여, 미국 MMC사의 Duraspan 바닥판과 동일한 크기의 바닥판 시험체를 필라멘트 와인딩으로 제작하여 휨시험을 실시하고 최대 파괴하중과 처짐, 변형률을 비교하였으며, 필라멘트 와인딩 바닥판 시험체와 동일한 바닥판 모델에 대해 구조해석을 실시하여 시험한 결과와 비교하였다.

착탈결구식 복합소재 바닥판의 연결부 거동분석 (Development of Composite Pedestrian Bridge Deck and Its Snap-fit Connection)

  • 이성우;정규상
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2005년도 추계학술발표대회 논문집
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    • pp.280-284
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    • 2005
  • Existing construction materials such as concrete and steel have chronic problems; deterioration and corrosion. Owing to its special features of light weight ‘ high durability, anti-corrosion, composite material used in civil infrastructure can not only solve fundamental problems of deterioration and corrosion, but also reduce both construction and maintenance cost significantly. After the fabrication of deck panel with snap-fit connection by pultrusion through composite design according to stacking sequence of composite laminates and structural analysis, performance of decks will be verified and evaluated by structural tests.

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착탈결구식 연결구조 복합소재 데크의 거동특성 분석 (Structural Characteristics of 스냅핏 Type Composite Deck Panel)

  • 이성우;정규상;조성환;심영식
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 2006년도 정기 학술대회 논문집
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    • pp.719-724
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    • 2006
  • Owing to its special features of light weight, high durability, corrosion-resistant, composite material used in civil infrastructure can not only solve fundamental problems of deterioration and corrosion, but also reduce both construction and maintenance cost significantly. Composite deck panels of 스냅핏 type connection previously designed and fabricated have been redesigned herein. The sensitivity of gaps between snap-fits and tip angles was investigated. Stacking sequence of plies was scrutinized in order to facilitate pultrusion process. Deck panels of redesigned configuration due to bending has been analyzed. A comparison between the preliminary and modified deck design has been made.

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풀트루젼과 와인딩 기법을 혼합한 탄소-유리 하이브리드 복합재 보강근 설계 (Design of Carbon-Glass Hybrid Composite Rebar by the Combined Pultrusion and Winding)

  • 권진회;최수영;최진호;이상관;박영환
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2004년도 춘계학술발표대회 논문집
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    • pp.9-12
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    • 2004
  • Presented is a preliminary design concept of the carbon-glass hybrid composite rebars for the application in the construction field. A glass fiber rod with indentation is used for the core of the rebar. Carbon fibers are placed over the glass core by pultrusion. To increase the mechanical locking force and bonding surface, carbon filament windings are added in the hoop direction over the carbon face. Finite element analysis and test were conducted to evaluate the effective stiffness and strength of the rods. The results show that the effective axial stiffness of the rebar with indentation are about $50\%$ of the straight rebar.

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FRP-콘크리트 합성 바닥판에 적용 가능한 FRP 부재의 최소 두께 (Minimum Thickness of FRP Member Applicable to FRP-Concrete Composite Deck)

  • 조근희;박성용;김성태;조정래;김병석
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2006년도 추계 학술발표회 논문집
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    • pp.317-320
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    • 2006
  • In order to determine a minimum thickness of the pultruded GFRP panel as a structural member, some experimental studies were performed. GFRP tubes with 2mm, 4mm, 6mm thickness were manufactured by pultrusion process. First, coupon tests for finding mechanical properties were carried out. Comparisons between test results and analysis results based on classical laminate theory showed large differences in case of 2mm, 4mm specimens. The reason is that it is difficult to apply appropriate pultruding force and keep layered stitched fabric flat for the pultrusion process of complex shaped FRP member with small thickness. On the consequence, we decide 6mm as a minimum thickness of FRP member. Second, 4-point bending tests were performed and the results with compared with numerical analysis. The behavior of FRP tube can be exactly predicted by numerical analysis if buckling analysis is included.

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나일론 6과 폴리프로필렌 수지에 유리섬유가 보강된삼상 복합재료에 관한 연구 (A Study on the Three Phase Glass Fiber/Nylon 6/Polyproylene Composites)

  • 서문호
    • 유변학
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    • 제10권2호
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    • pp.57-64
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    • 1998
  • A pultrusion resin impregnation (PRI) die, which has been developed recently in our laboratory, was used to pre-pare various composite system. The continuous fiber reinforced composites of glass fiber/polypropylene(GFPP) and glass fiber/polyamide 6 (GFPA) were first manufactured by means of the PRI die and then cut into chopped pellets of predet-ermined length. These pellets and either virgin or modified thermoplastic resin were melt-mixed by a twin screw extruder to prepare GF/PA/PP and GF/PA/PPMA system. The mechanical properties of these blends were investigated and discussed in terms of their morphological observations. These preliminary results revealed that this new impregnation die could be suc-cessfully applied to produce prepregs suitavle for the final shaping process.

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Bleich의 근사해법을 이용한 직교이방성 구조용부재의 탄성국부좌굴해석 (Elastic Local Buckling Analysis of Orthotropic Structural Shapes Using Bleich's Approximate Method)

  • 이원복;윤순종;이석순
    • 대한토목학회논문집
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    • 제14권4호
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    • pp.795-805
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    • 1994
  • 본 논문은 pultrusion process를 통해서 생산된 섬유보강 플라스틱 구조용부재(직교이방성)의 국부좌굴응력을 예측하기 위해서 기존의 동방성부재에 대한 근사적 이론식인 Bleich해법을 확장하여 직교이방성 부재의 경우에도 적용할 수 있도록 유도하였으며, 유도과정에서는 무차원 비를 도입 계산이 더욱 용이하도룩 하였다. 또한, 보고된 정밀해 및 실험한 결과치와 비교하였으며 pultrusion process를 통해서 생산된 섬유보강 플라스틱 구조용 부재의 국부좌굴응력을 예측하는데 이 식이 효과적으로 사용될 수 있음을 도식적으로 보여 주었다. 또 다양한 단면치수와 길이를 갖는 기풍의 국부좌굴응력을 예측하여 설계시 사용될 수 있도록 도식화하였다. 또한, 섬유보강 플라스틱 구조용부재(기둥)가 국부좌굴을 일으키지 않고 재료가 파괴에 도달하거나 Euler의 임계좌굴이 먼저 발생할 판의 폭과 두께의 비를 수식적으로 제안하였다.

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규사코팅 FRP와 콘크리트 부착특성에 동결융해가 미치는 영향 (Effect of Freezing and Thawing on Adhesion of Cement Concrete with Coarse-sand Coated FRP)

  • 이규필;박광필;황재홍;김동규
    • 한국구조물진단유지관리공학회 논문집
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    • 제17권2호
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    • pp.117-123
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    • 2013
  • 원형 구조물의 보수/보강 및 FRP를 구조부재로 활용한 신설 구조물 시공을 위해서는 일정한 곡률반경을 갖는 곡면 FRP 부재가 요구된다. 그러나 현재까지 FRP 곡면부재는 수작업 (hand-lay-up) 또는 필라멘트 와인딩 (filament winding) 작업에 의해서만 생산이 가능하였으며, 대량 연속생산에는 한계가 있다. 또한 일반적으로 인발성형법 (pultrusion method)으로 생산된 FRP 부재가 상대적으로 물리적 특성이 우수한 것으로 알려져 있다. 따라서 FRP 부재를 일정곡률을 유지하며 인발로 뽑아낼 수 있는 신개념의 곡면 FRP 부재 인발성형법 제안 및 성형장비를 개발, 곡면 FRP 제품을 생산하였으며, 본 연구에서는 곡면 FRP 부재를 이용한 구조물 보수/보강시 야기될 수 있는 FRP와 콘크리트 부착면의 동결융해 영향을 분석하였다.

FRP에서 와인딩 각도에 따른 압축강도의 시뮬레이션과 특성평가 (Simulation and Evaluation of Compressive Strength of FRP According to the Winding Orientation of Glass Fiber)

  • 박효열;강동필;한동희;김인성;표현동
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2000년도 영호남학술대회 논문집
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    • pp.250-253
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    • 2000
  • The fiber orientation in FRP has a great effect on the strength of FRP because the strength of FRP mainly depends on the strength of fiber. Unidirectional FRP made by pultrusion method has comparatively lower compressive strength than tensile strength. Compressive strength of unidirectional FRP may be increased by filament winding layer which has tensile stress when compressive stress was loaded. In this study, compressive strength and stresses of FRP rods were simulated according to the winding orientation of glass fiber. Inner part of FRP was made unidirectionally by pultrusion method and outer part of FRP was made by filament winding method. Simulated value and real evaluated compressive strength were compared to investigate stresses which is prominent to the fracture of FRP. The shear stresses had a great effect on the strength of FRP although the stress of parallel direction of FRP was much higher.

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