• Title/Summary/Keyword: FRP composite material

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A Study on Optimal Fitting for Tightness Characteristics of Composite Bushing (Composite 부싱의 기밀 특성을 위한 최적의 압착에 관한 연구)

  • Cho, Han-Goo;Kang, Hyung-Kyung;Yoo, Dea-Hoon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.06a
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    • pp.390-391
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    • 2009
  • Recently, composite hollow bushings have been increasingly employed mainly from the various characteristics. Composite bushings are superior to porcelain bushings in several respects, including lighter weight, better anti-pollution and anti-explosion properties, and easer manufacturing. This paper deals with the optimal thermal fitting for improved tightness characteristics of composite bushing. Two types of composite bushings were fabricated. For optimal fitting process, it is necessary using adhesive and designed internal structure of flange and FRP tube. In this study, for improved tightness characteristics of composite bushing has prominence and interface tolerance of flange and FRP tube. From FE-SEM analysis the adhesive layers were different with interface tolerance, sample 1 and 2 which have respective about $120{\mu}m$ and $50{\mu}m$.

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Result Analysis of Sea Trial Test for Offshore Fishing Boat Attached FRP Rudder (FRP 복합재료 방향타 장착 근해어선의 해상시운전시험 결과분석)

  • Park, Chung-Hwan;Jang, Ho-Yun;Park, Myung-Sik;Im, Nam-Kyun
    • Journal of Ocean Engineering and Technology
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    • v.27 no.6
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    • pp.112-118
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    • 2013
  • This paper reports the results of a comparative study on rudder performance between the steel rudders that have been used in coastal angling fishing boats in the 20-GT class and the newly developed FRP composite material rudders. In order to compare the rudder performances of these two types, a sea trial test was carried out to investigate the speed performance, fuel consumption, and ship's turning ability. The results showed that the sea trial performance of the FRP composite rudder was better than that of the steel rudder type in terms of the sea speed, fuel consumption rate, and turning ability.

The Performance Test and Mechanical Strength Analysis for 154kV Hollow Composite Insulator (154kV급 Hollow Composite Insulator의 기계적 강도해석 및 특성시험)

  • Park, Ki-Ho;Cho, Han-Gu;Han, Dong-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.11a
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    • pp.495-498
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    • 2002
  • This paper describes the results the problem of stress calculation and optimization into a FRP(Fiber-glass Reinforced Plastic) tube crimped into a metal end-fitting. This type of assembly is used mainly is used mainly for suspension and line post insulators. Fitting strength of FRP and flange of this study is required greatly from composite insulator to important special quality. Therefore, wish to seek analysis and mechanical strength performance that follow to FRP tube and flange of top and bottom mechanical fitting.

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Study on Optimum Design for constitution part of Composite Insulator (Composite Insulator 구성 부품에 대한 최적 설계 연구)

  • Chung, Young-Soo;Choi, Sung-Man;Jang, Yoon-Ki;Lee, Dong-Woen;Kim, Jeong-Bae
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.1181-1186
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    • 2008
  • Insulators which are used in the domestic electrical industries are mostly depended on importation from some advance countries. Even though insulators which are made of ceramic material have been mostly used domestically, the ratio of usage on composite insulators is recently being increased because of difficulties in manufacturing and high cost regarding ceramic stuffs. In this research, we are trying to develop the composite insulators which are very efficient in insulation regardless of the matter of weight. Even though the technique of manufacturing composite insulator are quite generalized worldwide at the moment, one of the most important issue is to keep security on the know-how that an ingredient of insulated material named 'SF6 gas' is included. Therefore, The aim of this paper is to improve the bonding force and air tight property between two components of composite insulator, Flange and FRP Tube.

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AE Characteristics for Fracture Mechanism of Al 7075/CFRP Hybrid Composite (Al 7075/CFRP Hybrid 복합재료의 파손특성에 대한 AE 특성 연구)

  • 이진경;이준현;송상헌;윤한기
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2001.05a
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    • pp.268-271
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    • 2001
  • When compared to other composite materials such as FRP and MMC, hybrid composite material is more attractive one due to the high specific strength and the resistance to fatigue. However, the fracture mechanism of hybrid composite material is extremely complicated because of the bonding structure of metals and FRP. Recently, nondestructive technique has been used to evaluate the fracture mechanism of these composite materials. In this study, AE technique has been used to clarify the fracture mechanism and the degree of damage for Al 7075/CFRP hybrid composite material. It was found that AE event, energy and amplitude among AE parameters were effective to evaluate fracture process of Al 7075/CFRP composite material. In addition, the relationship between the AE signal and the characteristics of failure surface using optical microscope was discussed.

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A Comparison of Design Strength Equations between Steel and Fiber Reinforced Polymer Composites Columns (철골 및 섬유보강 폴리머(FRP) 복합 기둥의 설계강도식에 관한 비교 연구)

  • Choi, Yeol;Pyeon, Hae-Wan
    • Journal of Korean Association for Spatial Structures
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    • v.3 no.3 s.9
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    • pp.85-93
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    • 2003
  • Steel, concrete and their combination materials are the most 6commonly used materials for civil engineering structural systems such as buildings, bridge structures and other structures. Recently, however, fiber reinforced polymer (FRP) composites, a relatively new composite material made of fibers and polymer resins, have been gradually used in structural systems as an alternative structural material. This paper describes a comparison of design strength equations for steel column and FRP composite column based on design philosophies. The safety factors used in allowable stress design (ASD) are relatively higher in FRP structural design than steel structural design. Column critical stress equations of FRP composites column from an experimental study can be represented by Euler elastic buckling equation at the long-range of slenderness, and an exponential form at the short-range of slenderness as defined in Load and Resistance Factor Design (LRFD) of steel column. The column strength of steel and FRP composite columns in large slenderness is independent of material strength, this result verified the elastic buckling equation as derived by Eq. (15) and Eq. (5).

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Vibration Analysis of Composite Laminated Plates Considered in Material-Nonlinearity (재료비선형을 고려한 복합적층판의 진동해석)

  • Seok, Keun-Yung;Kang, Joo-Won;Shin, Young-Shik
    • Journal of Korean Association for Spatial Structures
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    • v.6 no.4 s.22
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    • pp.45-52
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    • 2006
  • FRP laminated plates have strong material-nonlinearity. Through vibration Analysis of FRP laminated plates, the result of nonlinearity analysis is compared with the result of linearity analysis according to stacking angle and squency. This study is a fundamental study about displacement in nonlinearity dynamic behavior of FRP laminated plates.

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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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Numerical Study for Seismic Strengthening of RC columns Using Fiber Reinforced Plastic Composite (기둥의 내진성능 향상을 위한 섬유보강 복합체의 적용성에 대한 해석적 연구)

  • Chang, Chun Ho;Kwon, Min Ho;Kim, Jin Sup;Joo, Chi Hong
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.16 no.3
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    • pp.117-127
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    • 2012
  • As increasing number of large-size earthquake around Korean peninsula, many interests have been focused to the earthquake strengthening of existing structures. Fiber reinforced plastic composite material is one of strengthening material widely used to increase seismic performance of structures. It should have high stiffness as well as large ductility to provide best strengthening result. Thus selection of stiffener and fiber in composite is of important. In this study, the optimal combination of fiber and stiffener is selected with variety of tensile tests. In order to investigate performance of chosen composite material, several finite element analyses are performed with proposed FRP composite material for existing RC columns. It is discussed that the seismic performance of strengthened columns through the load-displacement relationship. It is shown that the proposed composite material can increase the strength as well as ductility of exiting RC columns.

Experimental Study on Freezing-Thawing and Warm-Moisture Resistance of FRP Composites used in Strengthening RC Members (FRP 복합체의 동결융해 및 고온.고습 저항성에 관한 실험 연구)

  • Choi, Ki-Sun;You, Young-Chan;Lee, Han-Seung;Kim, Keung-Hwan
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05b
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    • pp.345-348
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    • 2006
  • FRP composites which are used in strengthening existing structure are usually adhered to the concrete surface, their performance are directly affected by environmental condition such as freezing-thawing and moisture. Accordingly, it is required to evaluate bond durability between FRP composite and concrete as well as FRP materials itself. The durability characteristics of FRP composite for freezing-thawing are evaluated in this study with the variables of concrete strength, type of FRP composite, freezing-thawing conditions and freezing-thawing cycle. In addition, material durability of GFRP sheet for high temperature/high humidity condition are examined in this experimental study.

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