• Title/Summary/Keyword: Filament Winding

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Experiment of Compressive Strength Enhancement of Circular Concrete Column Confined by Carbon Tubes

  • Hong Won-Kee;Kim Hee-Cheul;Yoon Suk-Han
    • KCI Concrete Journal
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    • v.14 no.4
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    • pp.139-144
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    • 2002
  • Concrete filled FRP tube has lately attracted attention as the member that can substitute the conventional reinforced concrete. Glass fiber and carbon fiber are some of available materials for FRP tube. Carbon tube is filament wound with specified winding angle to meet the appropriate capacity demands. Confinement effect of carbon tube is varied according to winding angle. In this study, a total 4 of large scale circular specimens of 30cm diameter and 60cm height is tested. To estimate the effect of winding angle and thickness of carbon tube on the increased confined compressive strength, the test tube are wound with $\pm45^{\circ}\;and\;\pm30^{\circ}$ with two types of thickness, 2mm and 3mm, respectively. It is shown that effectively increased confined strength and ductility are observed from the specimens with $\pm45^{\circ}$ winding angle than $\pm30^{\circ}$ winding angle. Increasing thickness is not as effective as adjusting winding angle for the confinement of concrete core.

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Properties of Composite Bushing with Filament Winding Tension (필라멘트 와인딩 장력에 따른 Composite Bushing의 특성에 관한 연구)

  • Cho, Han-Goo;Kim, Kwang-Yong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.03b
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    • pp.34-34
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    • 2010
  • This paper describes effect of the bending deformation of high voltage composite bushing with winding tension. The composite bushing can be formed, by adding silicone rubber sheds to a tube of composite materials. The FRP tube is internal insulating part of a composite bushing and is designed to ensure the mechanical characteristics. Generally the properties of FRP tube can be influenced by the winding angle, wall thickness and winding tension. As winding tension is increased glass contents was increased in the range of 70.4~76.6%. In the bending test, winding tension is increased residual deflection was decreased in the range of 14.0~12.2 mm.

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O Analysis of Filament Wound Pressure Tank Considering Winding Angle Variation In Thickness Direction (두께 방향의 와인딩 각도 변화를 고려한 필라멘트 와인딩 된 압력탱크의 해석)

  • 김철웅;박재성;홍창선;김천곤
    • Composites Research
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    • v.13 no.2
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    • pp.51-60
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    • 2000
  • Filament wound pressure vessels have been studied for the efficient design tool to consider the variation of fiber angles through-the thickness direction. Filament winding patterns were simulated from semi-geodesic fiber path equation to calculate fiber path on arbitrary surface. Finite element analyses were performed considering fiber angle variation in longitudinal and thickness directions by ABAQUS. For the finite element modeling of the pressure tank, the 3-dimensional layered solid element was utilized. From the stress results of pressure tanks, maximum stress criterion in transverse direction was applied to modify material properties for failed region. In the end of each load increment, resultant layer stresses were compared with a failure criterion and properties were reduced to 1/10 for a failed layer. Results of progressive failure analysis were compared with two experimental data.

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An Integrated CAD/CAM System for CNG Pressure Vessel Manufactured by Deep Drawing and Ironing Operation

  • Park, Joon-Hong;Kim, Chul;Park, Jae-Chan
    • Journal of Mechanical Science and Technology
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    • v.18 no.6
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    • pp.904-914
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    • 2004
  • The fiber reinforced composite material is widely used in the multi-industrial field because of their high specific modulus and specific strength. It has two main merits which are to cut down energy by reducing weight and to prevent explosive damage proceeding to the sudden bursting which is generated by the pressure leakage condition. Therefore, Pressure vessels using this composite material can be applied in the field such as defence industry and aerospace industry. In this paper, for nonlinear finite element analysis of E-glass/epoxy filament winding of composite vessel subjected to internal pressure, the standard interpretation model is developed by using the ANSYS with AutoLISP and ANSYS APDL languages, general commercial software, which is verified as useful characteristic of the solution. Among the modules of the system, both the process planning module for carrying out the process planning of filament wound composite pressure vessel and the autofrettage process module for obtaining higher residual stress will minimize trial and error and reduce the period for developing new products. The system can serve as a valuable system for experts and as a dependable training aid for beginners.

A Study on Improving Fatigue Life for Composite Cylinder with Seamless Integrated Liner (이음매 없는 일체형 라이너를 갖는 복합재 압력용기의 피로수명 향상에 대한 연구)

  • Kim, Hyo-Joon
    • Journal of the Korean Institute of Gas
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    • v.17 no.6
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    • pp.46-51
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    • 2013
  • Composite cylinder is used by hydrogen fuel cell vehicles and natural gas vehicles because of high specific modulus, specific strength and fatigue resistance. composite cylinder has a seamless integrated liner and it is fully overwrapped with structural fibers of high strength carbon fibers in an epoxy matrix. In this study, filament winding pattern and autofrettage pressure design technique are presented considering structural weakness of knuckle and compressive residual stress. Presented methodology is verified by pressure cycling test of composite cylinders.

Development of Hydrogen Type3 composite cylinder for Fuel Cell vehicle (연료전지 차량용 TYPE3 복합재 고압용기 개발)

  • Chung, Jae-Han;Cho, Sung-Min;Kim, Tae-Wook;Park, Ji-Sang;Jeong, Sang-Su
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.11a
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    • pp.165-168
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    • 2007
  • The objective of this study is to demonstrate and commercialized for on-board fuel storage system for the hydrogen fuel cell vehicles. Type3 composite cylinder is consisting of the full wrapped composites on a seamless aluminum liner. Especially, the seamless aluminum liner has been commercialized with development of fabrication through this study. The key technologies, including design, analysis and the optimized filament winding process for 350bar composite cylinder, were established and verified with design qualification test in accordance with international standard. And the facilities for fabrication and design qualification test have been constructed.

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Development Of A Pole On The Distribution Line System (배전용 FRP 전주의 제조 기술 개발)

  • 이웅선;한만준;조한구;박기호;송일근
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.11a
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    • pp.402-404
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    • 2000
  • The FRP pole had great advantages over other material poles. Light weight, easy installing and transporting were good characteristics. The material's superior properties represented the good durability for sea weather and air pollution, good insulation for electric, and changeable colors. In those properties, usages were like a area affected by sea, downtown, the area among the mountains and a special area for the outstanding views. It was studied that pole manufacturing method, structure analysis of pole by FEM in this study. Filament winding method was selected for a new pole manufacturing method. It produced the tapered poles and mechanically strong properties.

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The Improvement of Survivability of Fiber Brags Grating Sensors Embedded into Filament Wound Pressure Tanks (필라멘트 와인딩된 복합재료 압력탱크에 삽입된 광섬유 브래그 격자 센서의 생존율 향상)

  • Kang, D. H.;Park, S. W.;Park, S. O.;Kim, C. G.
    • Composites Research
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    • v.18 no.5
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    • pp.1-8
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    • 2005
  • Among many fabrication methods of composite materials, filament winding is the most effective method for fabricating axis-symmetric structures such as pressure tanks and pipes. Filament wound pressure tanks are under high internal pressure during the operation and it has the complexity in damage mechanisms and failure modes. For this reason, it is necessary to monitor the tank through its operation as well as whole fabrication process. A large number of sensors must be embedded into multi points of the tank from its fabrication step for monitoring the whole tank. Fiber optic sensors, especially fiber Bragg grating(FBG) sensors are widely used for various applications because of good multiplexing capabilities. However, we need to develop the embedding technique of FBG sensors into harsh inner environment of the tank far the successful embedment. In this paper, we studied the embedding technique of a number of FBG sensors into filament wound pressure tanks considering multiplexing.

Design and Fabrication of Cone Type Composite Lattice Structures (Cone형 복합재 Lattice 구조물의 설계 및 공정 연구)

  • Doh, Young-Dae;Chung, Sang-Ki;Lee, Sang-Woo;Chang, Hong-Been
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.11a
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    • pp.307-311
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    • 2011
  • This paper is concerned with anisogrid composite lattice structures whose load bearing shell is formed by systems of geodesic unidirectional composite ribs made by automatic wet winding process. Lattice structures are usually made in the form of conical shell and consist of systems of helical and hoop ribs fabricated by continuous filament winding from carbon and epoxy composites. Design variables of the structure which are the angle of helical ribs and ribs spacings are determined by cone geometry and geodesic line. and Fabrication methods for the conical composite lattice structure are presented.

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Manufacturing Processes of Cylindrical Composite Lattice Structures using Filament Winding Method (필라멘트 와인딩 공법을 이용한 원통형 복합재 격자구조체 제작 공정)

  • Im, Jaemoon;Shin, Kwangbok;Lee, Sangwoo;Son, Johwa
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2017.05a
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    • pp.835-837
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    • 2017
  • In this paper, manufacturing processes of cylindrical composite lattice structures using filament winding method was described. Cylindrical composite lattice structures were manufactured in accordance with four major steps. Silicon mold of lattice shape was installed on mandrel and then continuous fiber was wound on silicon mold. After winding process, in order to ensure the same thickness for all regions, compression process was done for its intersection parts. Finally, the composite lattice structure was demoulded after curing in oven. It was found that the manufactured cylindrical composites lattice structure had 2.4% of dimensional error compared to the design requirements.

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