• 제목/요약/키워드: GFRP (Glass Fiber Reinforced Plastics)

검색결과 65건 처리시간 0.031초

해수 환경에서의 철근과 GFRP 리바의 굽힘 강도 특성에 관한 연구 (A study on the bending strength characteristics of steel bar and GFRP rebar in salt water surroundings)

  • 한길영;이동기;곽상묵;배시연;김기성
    • 한국해양공학회:학술대회논문집
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    • 한국해양공학회 2002년도 추계학술대회 논문집
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    • pp.354-358
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    • 2002
  • This paper describes the need for a ductile Fiber Reinforced Plastics (FRP) reinforcement for concrete structures. To promte the degradation of the adhesive condition at the fiber/matrix micro interface without matrix dissolution loss were carried out in salt water surrounding. The absorption properties and the bending strength were compared about GFRP rebar and steel bar.

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섬유강화 복합재료의 가공시 강화재가 공구마모에 미치는 영향 (The effects of reinforcements on the tool wear during cutting fiber-reinforced plastics)

  • 정용운;김주현;박주승;좌성훈
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 1999년도 제30회 추계학술대회
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    • pp.208-212
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    • 1999
  • In the use of glass fiber reinforced plastics(GFRP), cutting is often necessary. But the most of past studies have been interested in the effect of fiber orientation on tool wear. In this study, the effects of fiber contents on tool wear were investigated experimentally. By proper selection of cutting tool, the variables are cutting speed and fiber contents of 10, 20, 30wt% with fixed feed rate and depth of cut.

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피로하중을 받는 유리섬유 보강 플라스틱관의 안전성에 관한 연구 (An Experimental Study on the Safety of Glass Fiber Reinforced Plastic Pipes under Fatigue Load)

  • 채원규
    • 한국안전학회지
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    • 제11권3호
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    • pp.154-159
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    • 1996
  • In this thesis, a series of loading tests are conducted in order to investigate the fracture safety of GFRP(Glass Fiber Reinforced Plastics) pipes under fatigue load which are widely used in the developed countries becauses of their natural of anticorrosion and lightweight etc. . Fatigue test is performed by changing number of laminates and loading cycles to examine the flexural strains, the ductility and the fatigue strength for two million repeated loading cycles. From the fatigue test results, it was found that the larger the laminates of GFRP pipes is, the larger the stiffness of GFRP pipes under the fatigue load increases. This phenomenon is true until the fatigue failure. According to the S-N curve drawn by the regression analysis on the fatigue test results, the fatigue strength of percent of the static ultimate strength increases by increasing the laminates of GFRP pipes. The fatigue strength with two million repeated leading cycles in GFRP pipes with the laminates of GFRP pipes varing 15, 25, 35 shows about 75%, 80%, 84% on the static ultimate strength, respectively.

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코팅공구에 의한 섬유강화 복합재료의 선삭가공 특성 (Turning Characteristics of Fiber-Reinforced Plastics by Coated Tools)

  • 정용운;김주현
    • 한국공작기계학회논문집
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    • 제10권3호
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    • pp.38-42
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    • 2001
  • In the machining of glass fiber reinforced plastics(GFRP), turning has been often used. But the most of past studies have been interested in the effect of fiber orientation on tool wear. In this study, the effects of fiber contents and cutting speeds on tool wear, cutting force and surface roughness are investigated experimentally. By proper selection of cutting tool, the variables are cutting speed, fiber contents and cutting length with fixed feed rate and depth of cut. The fiber contents have major effects on coated tool wear which observed as abrasive wear type.

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GFRP 리바의 내구성에 관한 연구 (A Study on the Durability of Glass Fiber Reinforced Plastics Rebars)

  • 문창권;김형열;박영환
    • 동력기계공학회지
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    • 제9권2호
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    • pp.50-56
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    • 2005
  • The mechanical properties of glass fiber reinforced polymer reinforcing bars(rebar) in various environment conditions such as moisture, chloride, alkali and freeze-thaw actions at temperature ranging from room temperature($25^{\circ}C$) to high temperature of up to $80^{\circ}C$ have been studied. The test results indicated that tensile strength and interfacial shear strength of GFRP bar were decreased with the increasing of temperature and holding time of each environment condition. The degradation in alkali environment. was more serious than those in the other environments.

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A Study on the Cutting Characteristics of the Glass Fiber Reinforced Plastics by Drill Tools

  • Park, Jong-Nam;Cho, Gyu-Jae
    • International Journal of Precision Engineering and Manufacturing
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    • 제8권1호
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    • pp.11-15
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    • 2007
  • Composite materials are widely used to make all kinds of machine parts, internal and structural materials of cars, aerospace components, building structures, ship materials, sporting goods and others, It is worth while to use composite space substitute material in various applications when compared with others. But the use of composite material is limited in the field of the mechanical processing because of the difficulties in processing. Thus, it is proved that the surface is rough at the in and out sections of the hole processing when the GFRP is machined with HSS drill in the vertical machining center. And it is observed that the more it is processed, the more the fluid type long chip is changed into the powdered chip.

Effect of fabrication processes on mechanical properties of glass fiber reinforced polymer composites for 49 meter (160 foot) recreational yachts

  • Kim, Dave Dae-Wook;Hennigan, Daniel John;Beavers, Kevin Daniel
    • International Journal of Naval Architecture and Ocean Engineering
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    • 제2권1호
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    • pp.45-56
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    • 2010
  • Polymer composite materials offer high strength and stiffness to weight ratio, corrosion resistance, and total life cost reductions that appeal to the marine industry. The advantages of composite construction have led to their incorporation in U.S. yacht hull structures over 46 meters (150 feet) in length. In order to construct even larger hull structures, higher quality composites with lower cost production techniques need to be developed. In this study, the effect of composite hull fabrication processes on mechanical properties of glass fiber reinforced plastic (GFRP) composites is presented. Fabrication techniques investigated during this study are hand lay-up (HL), vacuum infusion (VI), and hybrid (HL+VI) processes. Mechanical property testing includes: tensile, compressive, and ignition loss sample analysis. Results demonstrate that the vacuum pressure implemented dining composite fabrication has an effect on mechanical properties. The VI processed GFRP yields improved mechanical properties in tension/compression strengths and tensile modulus. The hybrid GFRP composites, however, failed in a sequential manor, due to dissimilar failure modes in the HL and VI processed sides. Fractography analysis was conducted to validate the mechanical property testing results.

액정을 이용한 GFRP의 열적시험법에 관한 연구 (Thermal Inspection of GFRP using Liquid Crystal)

  • 김영환;권오양
    • 비파괴검사학회지
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    • 제10권2호
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    • pp.50-55
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    • 1990
  • Flaws in GFRP(Glass Fiber Reinforced Plastics) were thermally detected using cholesteric liquid crystals. Presence of flaws changes the thermal conductivity of GFRP, and disturbs heat flow. When a uniform heat source is applied, the surface temperature of flawed region is different from that of sound region. The surface temperature distributions were measured by thermo-optic properties of liquid crystal. Since the colors of liquid crystal indicate temperature distribution of GFRP surface, the thermal disturbance by flaws could be detected. The locations of flaws in GFRP could be determined from the distribution of liquid crystal colors.

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Influence of Uncertainties for Compressive Buckling of Composite Materials and Its Numerical Simulations

  • Ueda, Tetsuhiko;Takase, Shouhei;Ikeda, Tadashige;Iwahori, Yutaka
    • Advanced Composite Materials
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    • 제17권2호
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    • pp.177-190
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    • 2008
  • As the first step in discussing the reliability of composite structures, a fundamental study was performed to obtain the scattering characteristics of glass-fiber reinforced plastics (GFRP) and woven carbon fiber reinforced plastics (WCFRP) as well as a reference metal. The Euler buckling load was obtained experimentally for each material. The experiments were conducted for specified rectangular specimens with simply supported edges. A new attachment to realize the simply support boundary conditions for composite materials have been prepared before these experiments. The scattering data in the results for GFRP and WCFRP composites were compared with those of a typical metal of aluminum alloy. The experimental data were also compared with numerical simulations including the uncertainties.

인공발(Prosthetic Foot) 스프링용 유리섬유강화 적층재의 적층배향에 따른 층간분리거동 해석 (Analysis of Delamination Behavior on the Stacking Sequence of Prosthetic Foot Keel in Glass fiber Reinforced Laminates)

  • 송삼홍;김철웅
    • 대한기계학회논문집A
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    • 제27권4호
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    • pp.623-631
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    • 2003
  • It is considered that the application of advanced composite materials to the prostheses for the disables is important to improve their bio-mechanical performance. Particularly, energy storing foot prosthesis is mostly important to restore gait ability of the disables with low-extremity amputation since it could provide propulsion at terminal stance enhancing the disables ability to walk long distance even run and jump. Therefore, the energy storing spring of Prosthetic foot keel under cyclic bending moment use mainly of high strength glass fiber reinforced plastic. The main objective of this study was to evaluate the stacking sequence effect using the delamination growth rate(dA$_{D}$/dN) of energy storing spring in glass fiber reinforced plastic under cyclic bending moment. The test results indicated that the shape of delamination zone depends on stacking sequence in GFRP laminates. Delamination area(A$_{D}$) turns out that variable types with the contour increased non-linearly toward the damage zones.nes.