• Title/Summary/Keyword: pultrusion

Search Result 85, Processing Time 0.041 seconds

Development and Durability Evaluation of a Bimaterial Composite Frame by Pultrusion Process (인발성형 공정을 통한 이종재료 복합소재 프레임 개발 및 내구성 평가)

  • Lee, Haksung;Kang, Shinjae
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.23 no.2
    • /
    • pp.145-151
    • /
    • 2014
  • Recently, the growing demand for weight reduction and improved structure durabilityfor commercial vehicles has led to active research into the development and application of suitablecomposite materials. This studysuggests abimaterial composite frame produced by apultrusion process to replace steel frames. We focused on the development of a composite frameconsisting of two types of materialsby mixing anorthotropic material with anisotropic material. The inside layer consisted of an aluminum pipe, and the outside layer was composed of a glass fiber pipe. To determine the strength and failure mechanisms of the composite material, tensile tests, shear tests, and three-point bending tests were conducted, followed by fatigue tests. After static testing, the fatigue tests were conducted at a load frequency of 5 Hz, a stress ratio (R) of 0.1, and an endurance limit of $10^6$ for the S-N curve. The resultsshowed that the failure modes were related to both the core design and the laminating conditions.

Fabrication, Durability and Structural Characteristics of Composite Bridge Deck of Hollow Section (중공단면 복합소재 교량 바닥판의 제작성, 내구성 및 구조거동평가)

  • Lee Sung-Woo
    • Journal of the Computational Structural Engineering Institute of Korea
    • /
    • v.18 no.4 s.70
    • /
    • pp.427-434
    • /
    • 2005
  • In this study, to develop composite bridge deck of many advantages such as light weight, high strength, corrosion resistance and high durability, profile design, laminate design and finite element analysis were carried out. In the analysis, 5-girder single span bridge with composite deck was considered. Deflection serviceability, failure criteria and web buckling were evaluated. Composite deck of designed profile was fabricated with pultrusion process. The coupon tests were conducted for the fabricated deck and the results were described.

Mechanical Characteristics of Hybrid Fiber Reinforced Composite Rebar (하이브리드 섬유강화 복합재료 리바의 기계적 특성)

  • HAW GIL-YOUNG;AHN DONG-GUE;LEE DONG-GI
    • Journal of Ocean Engineering and Technology
    • /
    • v.19 no.1 s.62
    • /
    • pp.57-63
    • /
    • 2005
  • The objective of this research is to investigate the mechanical characteristics of the hybrid fiber reinforced composite rebar, which is manufactured from a braidtrusion process. Braidtrusion is a direct composite fabrication technique, utilizing in-line brading and the pultrusion process. hz order to obtain the mechanical behavior of the glass fiber, carbon fiber, and kevlar fiber, the tensile tests are carried out. The results of the fibers are compared with that of steel. Hybrid rebar specimens with various diameters, ranging from model size (3 mm) to full-scale size (9.5 mm), and various cross sections, such as solid and hollow shape, have been manufactured from the braidtrusion process. The tensile and bending tests for the case of the hybrid rebar, the conventional GFRP rebar, and the steel bar have been carried out. The results of the experiments show that the hybrid rebar is superior to the conventional GFRP rebar and the steel bar, from the viewpoint of tensile and bending characteristics.

Mechanical Properties of Insulator FRP Rod According to the Winding Orientation of Glass Fiber (유리섬유의 배향에 따른 전기절연용 FRP의 강도특성)

  • Park, Hyo-Yeol;Gang, Dong-Pil;Han, Dong-Hui;Pyo, Hyeon-Dong;Kim, Tae-Ok
    • The Transactions of the Korean Institute of Electrical Engineers C
    • /
    • v.49 no.6
    • /
    • pp.321-327
    • /
    • 2000
  • FRP has been used very much as high strength and electrical insulation materials. The fiber contributes the high strength and modulus to the composite. The main roles of the matrix in composite materials like FRP are to transmit and distribute stresses among the individual fibers. 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, compressive and bending stresses of FRP rods were simulated and measured 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 to give fiber orientation to the FRP. The shear stresses had great effect on the strength of FRP although the stress of parallel direction of FRP was much higher. The tendency of compressive and bending strengths with glass fiber orientation was different each other.

  • PDF

Bond Performance of FRP Reinforcing Bar for Concrete Structures after Chemical Environmental Exposure (화학적 환경에 노출된 콘크리트 보강용 FRP 보강근의 부착 성능)

  • Park, Chan-Gi;Won, Jong-Pil
    • Journal of The Korean Society of Agricultural Engineers
    • /
    • v.46 no.3
    • /
    • pp.73-81
    • /
    • 2004
  • FRP reinforcing bars(rebars) are produced through a variety of manufacturing process includes pultrusion, and filament winding and braiding etc. Each manufacturing method produces a different surface condition of FRP rebar. The surface properties of FRP rebar is an important property for mechanical bond with concrete. Current methods of providing surface deformation to FRP rebars include helical wrapping, surfaces and coating and rib molding. The problem with the helical wrapping method is that it can not provide enough surface deformation for good bond and it can be easily sheard off from the FRP rebars. Sand coating and rib molding provide surface deformation only to the outer FRP skins. Therefore, FRP rebar has about 60% of bond strength of steel rebar. The main objective was to evaluate the bond properties of FRP rebar after environmental exposure. Five types of FRP rebar includes CFRP ISO, GFRP Aslan, AFRP Technora CFRP(Korea), and GFRP(Korea) rebars performed direct bond tests. Also, FRP rebar bond specimens were subjected to exposure conditions including alkaline solution, acid solution, salt solution and deionized water etc. According to bond test results, CFRP(Korea) and CFRP(Korea) rebars were found to have better bond strength with concrete than previous FRP rebars. Also, FRP(Korea) rebar had more than about 70% in bond strength of steel rebar.

Study on Pultrusion of FRP by Dielectric Heating (유전가열에 의한 FRP의 인발성형 연구)

  • Park, Hoy-Yul;Kang, Dong-Pil;Ahn, Myeong-Sang
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2004.07a
    • /
    • pp.445-448
    • /
    • 2004
  • Radio frequency and microwave dielectric heating are well-known electroheating methods, used in industrial applications where non electrically conducting materials are to be heated, dried or otherwise processed. The major reason for considering this technique for any process is based on its unique ability to transfer heat into the volume of an electrically non conducting material such as insulator directly, rather than, via a surface. Conventional heating must first bring heat to the product surface and there after it depends on the physical characteristics and condition of the material as to how effectively this heat is transmitted into the mass. The product would suffer surface damage before the main body is adequately processed. Dielectric heating is applied to enhance conventional heating methods and to drastically shorten the required processing duration. Although the use of dielectric heating has been a well proven technique for several years in some industries, its application in the preheating of FRP has been limited by the insufficient experience. In this paper a method is described for uniform radio frequency heating of preheating of FRP.

  • PDF

Flexural Reinforcement of RC Beams with Pultruded Carbon and Glass Fiber Strip (탄소 및 유리섬유 풀트루션 스트립을 이용한 RC보의 휨보강 연구)

  • 정원용;이성우
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 1999.10a
    • /
    • pp.689-692
    • /
    • 1999
  • In recent years, FRP plates have been studied for flexural reinforcement of RC structures due to easy installation and good quality control. This study presents experimental results for the effectiveness of flexural reinforcement of the RC beams using thin CFRP and GFRP stripe made by the pultrusion process. For the selected FRP strips of various thicknesses and widths, it was demonstrated that both flexural strength and ductility were considerably increased with relatively easy installation when compared to the other methods used for the composite reinforcement.

  • PDF

Elastic Buckling Behavior of Orthotropic Equal-leg Angle Members (직교이방성 등변앵글부재의 탄성좌굴)

  • 김정곤;윤순종
    • Proceedings of the Korean Society For Composite Materials Conference
    • /
    • 2001.05a
    • /
    • pp.54-59
    • /
    • 2001
  • This paper presents an analytical investigation pertaining to the elastic buckling behavior of pultruded fiber reinforced plastic equal-leg angle members under concentric axial compression. The elastic local and global buckling (flexural, torsional, and flexural-torsional) analyses are conducted, respectively, and the analytical results are compared with the existing experimental results. The differences were more than 10%, and the experimental results were higher than the analytical results.

  • PDF

Application of Composites to Construction Industry and Development of Concrete Filled Composite Compression Member (복합소재의 건설분야 응용현황과 콘크리트 합성압축부재의 개발)

  • 이성우;박신전
    • Proceedings of the Korean Society For Composite Materials Conference
    • /
    • 1999.11a
    • /
    • pp.183-188
    • /
    • 1999
  • Due to many advantages of advanced composite materials, research on the application of composites to the construction industry is initiated. In this paper, fabrication methods efficient for infrastructures and application examples of each method are discussed. It also presents the structural characteristics of concrete filled glass fiber reinforced composite tubular member. Experimental results shows that strength and ductility of composite compression member is considerably increased due to concrete confinement action of composite surface.

  • PDF

Case study on the external prestressing method strengthened carbon fiber reinforced plates. (탄소섬유 보강판 전용 정착장치를 이용한 외부 프리스트레싱 보강공법 사례연구)

  • 정원용;임공묵
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2003.05a
    • /
    • pp.1003-1006
    • /
    • 2003
  • In recent years, FRP plates have been studied for flexural reinforcement of RC structures due to easy installation and good Quality control. This study presents experimental field test results for the effectiveness of flexural reinforcement of the RC slab using external prestressing with thin CFRP strips made by the pultrusion process. It was demonstrated that flexural strength was considerably increased with relatively easy installation when compared to the other methods used for the composite reinforcement.

  • PDF