• Title/Summary/Keyword: pultrusion

Search Result 85, Processing Time 0.028 seconds

Elastic Buckling Analysis of Orthotropic Plate with Edge Stiffener (연단보강재가 설치된 직교이방성 평판의 좌굴해석)

  • Yoon, Soon Jong;Lee, Won Bok
    • KSCE Journal of Civil and Environmental Engineering Research
    • /
    • v.14 no.2
    • /
    • pp.281-290
    • /
    • 1994
  • This paper presents the results of an analytical investigation pertaining to the compression behavior of axially loaded plates made from pultruded fiber reinforced plastic materials. Non-dimensionalized closed-form solutions have been developed for the prediction of the buckling load in the pultruded plates with edge stiffener. These solutions were based upon the classical theory of orthotropic plates and accounted for the e1astic restraints at the juncture of plate and stiffener. The effects of edge stiffener on the flange plate were investigated in order to clarify its usefulness for increasing flange local buckling load of the pultruded structural shapes.

  • PDF

Ductile Effect of Hybrid Fiber Reinforced Composite Rebar (하이브리드 섬유강화 복합재료 리바의 연성효과)

  • Choi, Myung-Sun;Han, Gil-Young;Lee, Dong-Gi;Ahn, Dong-Gue
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
    • /
    • 2003.10a
    • /
    • pp.112-116
    • /
    • 2003
  • This paper describes the need for a ductile of Fiber Reinforced Plastic(FRP) reinforcement for concrete structures. The criteria to be met by the FRP, which are based on the properties of the steel rebar it is to replace, are threefold: high initial modulus, a definite yield point and a high level of ultimate strain. It is shown that the use of a fiber architecture based design methodology facilitates the optimization of the performance of FRP through material and geometric hybrid. Ductile hybrid FRP bars were successfully fabricated at 3mm and 5mm nominal diameters using an in-line braiding and pultrusion process.

  • PDF

Development of Hybrid Fiber Reinforced Plastics Rebar for Concrete Structure by the Braidtrusion Process (브레이드 투루젼법에 의한 콘크리트 구조물용 하이브리드 섬유강화 복합재료 리바 개발)

  • 최명선;한길영;이동기;심재기
    • Proceedings of the Korean Society For Composite Materials Conference
    • /
    • 2001.10a
    • /
    • pp.199-205
    • /
    • 2001
  • This paper describes the design methodology, manufacturing process, rebar tensile and bending properties. Braidtrusion is a direct Composite fabrication technique utilizing an in-line braiding and pultrusion process. The produced Composite rebar exhibits ductile stress-strain behavior similar to that of conventional steel bar. Various rebar diameters ranging from modeling scale(3m) to full-scale prototype of 9.5mm have been produced Glass Fiber Reinforced Plastics(GFRP) rebar were successfully fabricated at $\phi$8.5mm and $\phi$9.5mm nominal diameters of soild and hollow type using a braidtrusion process. Tensile and bending specimens were tested and compared with behavior of stress-strain of GFRP rebar and steel bar.

  • PDF

Mechanical Strength Analysis of Station Type Po1ymer Insulator (좌립형 폴리머 지지애자의 기계적 강도 해석)

  • 조한구;박기호;한동희
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
    • /
    • 2000.11a
    • /
    • pp.85.1-88
    • /
    • 2000
  • FRP has been used very much as high strength core materials for insulators because of its high strength and good insulation properties. In this study cantilever, tension and torsion stress were simulation along to the unidirection glass fiber. In addition, FRP was made by pultrusion method. This paper proposed the procedure of the finite element model updating and pretest using the commerical finite element code MSC.Nastran. To ehance the efficiency of experimental modal analysis, we proposed the process which is the selection of the locations and the number of measurement points for pre-test.

  • PDF

Strength of Insulator FRP Rod According to the Winding of Glass Fiber (전기절연용 FRP의 와인딩 각도에 따른 강도특성)

  • 박효열;강동필
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2001.07a
    • /
    • pp.586-588
    • /
    • 2001
  • Inner part of FRP specimen was made unidirectionally by pultrusion method and outer part of FRP was made by filament winding method to study the effect of fiber orientatons on the strength of FRP. The strength of bending and compression was simulated and evaluated. The results of simulated strength and evaluated strength were different greately each other. The stress which affect the feature of FRP was simulated to investigate the difference of the results between simulation and evaluation Shear stresses were investigated to the main stress to affect the fracture of FRP.

  • PDF

Bending Strength of FRP According to the Winding Orientation of Glass Fiber (와인딩 각도에 따른 FRP의 굽힘강도)

  • 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
    • /
    • 2000.05b
    • /
    • pp.242-245
    • /
    • 2000
  • The fiber contributes the high strength and modulus to the composite. 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. In this study, FRP was made unidirectionally by pultrusion method and outer part of FRP was made by filament winding method to give fiber orientation to the FRP. The bending strength and bending stresses of FRP rods were simulated according to the winding orientation of glass fiber. The bending strength of FRP was also evaluated. The results of simulation and evaluation Were compared each other to investigate main stresses which affect the fracture of FRP. The main stresses which had a great effect on the strength of FRP were shear stresses.

  • PDF

A Study on the Manufacturing of Hybrid Fiber Reinforced Plastic Rebar Using In-Line Braiding and Pultrusion (라인 브레이딩 펄트루젼을 이용한 하이브리드 섬유강화 복합재료 리바 제작에 관한 연구)

  • 신용욱;한길영;이동기;심재기;오환교
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
    • /
    • 2000.04a
    • /
    • pp.57-62
    • /
    • 2000
  • This paper describes the need for a ductile Fiber Reinforced Plastic(FRP) reinforcement for concrete structures. Using the material hybrid and geometric hybrid. it is demonstrated that the pseudo-ductility characteristic can be generated in FRP rebar. Ductile hybrid FRP bars were successfully fabricated at 4mm and 10mm nominal diameters using an hand lay up method. Tensile specimens from these bars were tested and compared with behavior of FRP rebar and steel bar

  • PDF

The properties of hybrid FRP rebar for concrete structures (콘크리트 보강용 하이브리드 FRP 리바의 특성)

  • 원종필;박찬기;황금식;윤종환
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2003.05a
    • /
    • pp.255-260
    • /
    • 2003
  • The corrosion of steel rebars has been the major cause of the reinforced concrete deterioration. It is FRP rebar that is developed to solve problem of such steel rebar. FRP rebar in concrete structures should be used as a substitute of steel rebars for that cases in which aggressive environment produce high steel corrosion, or lightweight is an important design factor, or transportation cost increase significantly with the weight of the materials. But FRP rebar have only linearly elastic behavior; whereas, steel rebar has linear elastic behavior up to the yield point followed by large plastic deformation and strain hardening. Thus, the current FRP rebars are not suitable concrete reinforcement where a large amount of plastic deformation prior to collapse in required. The main objective of this study was to develop new type of hybrid FRP rebar. The manufacture of the hybrid FRP rebar was achieved pultrusion, braiding and filament winding techniques. Tensile and interlaminar shear test results of hybrid FRP rebar can provide its excellent tensile strength-strain behavior and interlaminar stress-strain behavior.

  • PDF

A Study on the Mechanical Characteristics of Ho1low Type Glass Fiber Reinforced Plastics Re-bar (중공형 GFRP리바의 기계적 특성에 관한 연구)

  • 한길영;이동기;오환교;홍석주;신용욱;배시연
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
    • /
    • 2000.10a
    • /
    • pp.7-11
    • /
    • 2000
  • In this paper was studied on the mechanical characteristics of Glass Fiber Reinforced Plastics(GFRP) of the steel bar it is to replace. The advantage of FRP such as high strength, low weight and chemical inertness or noncorrosiveness can be fully exploited. GFRP bar were successfully fabricated at l0mm nominal diameters of solid and hollow types using a pultrusion method. Tensile and bending specimens from this bar were tested and compared with behavior of GFRP rebar and steel bar.

  • PDF

Composite applications to automobiles (섬유강화 복합재료와 자동차)

  • 이상관;김병선
    • Journal of the korean Society of Automotive Engineers
    • /
    • v.18 no.5
    • /
    • pp.96-120
    • /
    • 1996
  • 현재 자동차용 복합재료를 생산하는데 유리한 제조방법으로는 압축성형 (Compression Molding), 액상성형(Liquid Molding), 인발성형(Pultrusion), 필라멘트 와인딩성형(Filament Winding)등이 있다. 압축성형은 현재 자동차 외장부품 성형에 널리 알려져 있는 SMC(Sheet Molding Compound)성형, 최근에 많은 연구가 되고 있는 LMPC(Low Pressure Molding Compound)성형, GMT(Glass Mat Reinforced Thermoplastics)성형 등이 있다. 액상성형은 RTM(Resin Transfer Molding)과 VARI (Vacuum Assisted Injection Molding), SRIM(Structure Reaction Injection Molding) 등이 있으며, 자동차 산업뿐만 아니라 일반 산업에서도 최근 많은 각광을 받고 있다. 그러므로 본 소고에서는 자동차용 복합재료의 제조에 널리 사용되는 성형공정에 대하여 간단히 살펴보고, 자동차 부품에 있어서의 복합재료 응용 현장과 최근 환경문제가 대두되면서 관심의 초점이 되고 있는 자동차용 복합재료 재활용 기술에 대하여 고찰하고자 한다.

  • PDF