• Title/Summary/Keyword: pultrusion

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

  • Lee, Haksung;Kim, Eunsung;Oh, Jeha;Kim, Dongki;Lee, Juyoung;Kang, Shinjae
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.22 no.3
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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.

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

  • Lee, Sung-Woo
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.18 no.2
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    • pp.191-200
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    • 2005
  • To develop composite bridge deck, comparative study on the flexural characteristics of deck fabricated with filament winding and pultrusion was performed. In this study, composite deck of triangular shape was fabricated with filament winding process and flexural tests were conducted along with pultruded 'Duraspan' deck. Failure load, maximum deflection and strains were compared with each other. Also finite element analysis for filament winding deck was carried out and the results were compared with those from experiments.

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

  • Lee, Sung-Woo;Jeong, Gyu-Sang
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2005.11a
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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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Structural Characteristics of 스냅핏 Type Composite Deck Panel (착탈결구식 연결구조 복합소재 데크의 거동특성 분석)

  • Lee Sung-Woo;Jeong Gyu-Sang;Cho Sung-Hwan;Sim Young-Sik
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2006.04a
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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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Design of Carbon-Glass Hybrid Composite Rebar by the Combined Pultrusion and Winding (풀트루젼과 와인딩 기법을 혼합한 탄소-유리 하이브리드 복합재 보강근 설계)

  • Kweon Jin-Hwe;Choi Soo-Young;Choi Jin-Ho;Lee Sang-Gwan;Park Young-Hwan
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2004.04a
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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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Minimum Thickness of FRP Member Applicable to FRP-Concrete Composite Deck (FRP-콘크리트 합성 바닥판에 적용 가능한 FRP 부재의 최소 두께)

  • Cho, Keun-Hee;Park, Sung-Yong;Kim, Sung-Tae;Cho, Jeong-Rae;Kim, Byung-Suk
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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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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A Study on the Three Phase Glass Fiber/Nylon 6/Polyproylene Composites (나일론 6과 폴리프로필렌 수지에 유리섬유가 보강된삼상 복합재료에 관한 연구)

  • 서문호
    • The Korean Journal of Rheology
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    • v.10 no.2
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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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Elastic Local Buckling Analysis of Orthotropic Structural Shapes Using Bleich's Approximate Method (Bleich의 근사해법을 이용한 직교이방성 구조용부재의 탄성국부좌굴해석)

  • Lee, Won Bok;Yoon, Soon Jong;Lee, Seok Soon
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.14 no.4
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    • pp.795-805
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    • 1994
  • This paper presents the analytical results for the prediction of elastical local buckling stress of fiber reinforced plastic (orthotropic) structural shapes manufactured from pultrusion process. In the derivation, existing Bleich's approach which was originally derived for the isotropic structural shapes was extended and non-dimensionalized parameters which can simplify the numerical calculations were adopted. Analytical results were compared with reported closed-form solutions and experimental results. It is graphically shown that the results can be used effectively to predict the local buckling stress of pultruded fiber reinforced plastic structural shapes. Numerical results were presented graphically to estimate the local buckling stress of various cross-sectional dimensions and lengths of columns. In addition, limits of width to thickness ratio of flange and web of pultruded structural shapes were suggested in which material failure or overall buckling occurs prior to local buckling.

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

  • Lee, Gyu Phil;Park, Kwang Phil;Hwang, Jae Hong;Kim, Dong Gyou
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.17 no.2
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    • pp.117-123
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    • 2013
  • As fiber reinforced polymer (FRP) material is appled for a curved structure such as tunnel, FRP material must has a curved shape. Until now, the curved FRP material has been producted by hand-lay-up or filament winding work. It is impossible for mass production of the curved FRP material by these methods. Also, the quality of product by these methods is lower than that by pultrusion method. New pultrusion method and equipment had been developed for production of FRP material with steady curvature. The objective of this study is to evaluate the effect of freezing and thawing on adhesion of cement concrete with coarse-sand coated FRP in repair and reinforcement of cement-concrete structure using curved FRP material.

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

  • Park, Hoy-Yul;Kang, Dong-Pil;Han, Dong-Hee;Kim, In-Sung;Pyo, Hyun-Dong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.05b
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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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