• Title/Summary/Keyword: Fiber Reinforced Plastic

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Study for resistance Plastic Shringage Cracking and apply field of Cellulose Fiber Reinforced Concrete (셀룰로스 섬유의 소성수축균열 저항성과 현장적용에 관한연구)

  • Park, Sung-Woo;Kim, Kyu-Yong;Yun, Sung-Hoon;Kwon, Yong-Joo;Kim, Dae-Yong
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.11a
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    • pp.699-702
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    • 2004
  • Plastic shrindage cracking occurs at the exposed surfaces of freshly placed concrete due to consoilidation of the concrete mass and rapid evaporation of water from the surface. This so called shrindage craking is a major concern for concrete, especially for been performed to obtain the plastic shrindage porperties of cellolus fiber reinforced concrete. The results of tests of the cellolus fiber were compared with plain and polypropylene fibers. Test results indicated that cellolus fiber reinforcement showed an aility to reduce the total crack area and maximum crack width significantly.

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A study on the mechanical properties of reinforced Nylon66 for glass fiber type and its orientation (나일론66에서 유리섬유의 종류 및 애향에 따른 기계적 물성 연구)

  • Ryu, J.B.;Lyu, M.Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2009.05a
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    • pp.374-377
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    • 2009
  • Glass fiber reinforced nylon has been used in many plastic industries. Mechanical properties of reinforced plastics depend upon types of glass fiber as well as loading of glass fiber. Tensile properties of glass fiber reinforced nylon66 have been studied for different glass fiber types and sizes. Types of glass fibers were circular and flat, and diameters were 7, 10, and 13 micrometers. Orientations of glass fibers in the matrix of nylon66 have been analyzed through X-ray CT. Tensile specimens were prepared by cutting out of square plates of $100{\times}100{\times}3mm$ with different angles such as 0, 45, and $90^{\circ}$ to the flow direction. As the loading of glass fiber increases to 45 wt% tensile strength increases up 2.5 times compare with neat nylon66. Anisotropic tensile strength has been observed and minimum tensile strength was measured in the specimen cut from perpendicular to the flow direction.

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Bearing Strength of Glass Fiber Reinforced Glulam Bolted Connection

  • Kim, Keon-ho;Hong, Soon-il
    • Journal of the Korean Wood Science and Technology
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    • v.43 no.5
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    • pp.652-660
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    • 2015
  • To study the bearing characteristics of glass fiber reinforced glulam for structural design, bearing strength tests were performed. Bearing loads were applied in the direction parallel to the grains, and the holes were prepared in such a way that the bolts would bear and support all the layers. The yield bearing strengths of the glass fiber reinforced glulam were found to be similar to those of the non-reinforced glulam, and were almost constant regardless of increases in bolt diameter. The ratio of the experimental yield bearing strength to the estimated bearing strength according to the suggested equation of the Korea Building Code and National Design Specification was 0.91~1.03. For the non-reinforced glulam and the sheet glass fiber reinforced plastic glulam, the maximum bearing load was measured according to the splitting fracture of specimens under bolt. The textile glass fiber reinforced glulam underwent only an embedding failure caused by the bearing load. The failure mode of reinforced glulam according to bearing load will influence the failure behavior of bolted connection, and estimating the shear yield strength of the bolted connection of the reinforced glulam is necessary, not only by using the bearing strength characteristics but also using the fracture toughness of the reinforced glulam.

Evaluation of Crack Control and Permeability of Hydrophilic PVA fiber Reinforced Cement Composite (친수성 PVA 섬유보강 시멘트 복합체의 균열제어 및 투수성 평가)

  • Won Jing-Pil;Hwang Keum-Sik;Park Chan-Gi;Park Hae-Geun
    • Journal of the Korea Concrete Institute
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    • v.16 no.3 s.81
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    • pp.391-396
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    • 2004
  • Plastic shrinkage crack occurs at the exposed surfaces of freshly placed concrete due to consolidation of the concrete mass and rapid evaporation of water from the surface. This so-called shrinkage crack is a major concern for concrete, especially for flat structures such as pavements, slabs for industrial factories and retaining walls. This study has been performed to obtain the plastic shrinkage and the permeability of hydrophilic poly vinyl alcohol(PVA) fiber reinforced mortar and concrete. Test results indicated that PVA fiber reinforced cement composite showed an ability to reduce the total crack area and the maximum crack width (as compared to plain and polypropylene fiber reinforced concrete). Also, according to the permeability test result, it was found that PVA fiber reinforced cement composite was more reducing than polypropylene fiber reinforced cement composite.

A Study of the Cutting Properties of Epoxy Resins (에폭시 수지의 절삭가동에 관한 연구)

  • 김희남
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1997.10a
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    • pp.76-81
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    • 1997
  • In the past polyester was usually used as the matrix of all fiber-reinforced plastic (FRP). Nowadays, however, epoxy resin has taken the place of polyester due to its superior properties. If the cutting properties of epoxy resin are unknown, It is difficult to find the optimum cutting conditions of all fiber-reinforced plastic such as CFRP. AFRP. GFRP. In this paper, I will study the cutting properties of epoxy resin by testing surface roughness.

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섬유함유율에 따른 GF/PP 복합재료의 인장강도

  • 엄윤성;고성위
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • 2003.10a
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    • pp.39-42
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    • 2003
  • 최근에 널리 쓰이고 있는 섬유강화 복합재료는 플라스틱 재료가 갖고 있는 가공성의 장점을 충분히 발휘한 재료로서 모재인 수지와 강화재인 강화섬유로 구성되며 사용된 섬유의 종류에 따라 유리섬유강화플라스틱(GFRP : glass fiber reinforced plastic)과 탄소섬유강화플라스틱(CFRP : carbon fiber reinforced plastic)으로 구분된다. 이 두 복합재료가 건설, 선박, 자동차 그리고 우주항공분야에 이르기까지 거의 모든 산업에서 다양하게 이용되고 있다. (중략)

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p-Version Nonlinear Finite Element Analysis of RC Slabs Strengthened with Externally Bonded CFRP Sheets (탄소섬유보강 플라스틱시트로 외부보강된 RC 슬래브의 p-Version 비선형 유한요소 해석)

  • Cho, Jin-Goo;Park, Jin-Hwan
    • Journal of The Korean Society of Agricultural Engineers
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    • v.48 no.1
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    • pp.61-68
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    • 2006
  • The p-version nonlinear finite element model has been developed to analyze the nonlinear behavior of simply supported RC slabs strengthened with carbon fiber reinforced plastic sheets. The shape function is adopted with integral of Legendre polynomials. The compression model of concrete is based on the Kupfer's yield criterion, hardening rule, and crushing condition. The cracking behavior is modeled by a smeared crack model. In this study, the fixed crack approach is adopted as being geometrically fixed in direction once generated. Each steel layer has a uniaxial behavior resisting only the axial force in the bar direction. Identical behavior is assumed fur tension and compression of steel according to the elastic modulus. The carbon fiber reinforced plastic sheets are considered as reinforced layers of equivalent thickness with uniaxial strength and rigidity properties in the present model. It is shown that the proposed model is able to adequately predicte the displacement and ultimate load of nonlinear simply supported RC slabs by a patch with respect to reinforcement ratio, thickness and angles of CFRP sheets.

A Study on the characteristics of the Signals of AE according to Fracture mode of CFRP under Tensile load (탄소섬유강화플라스틱(CFRP)의 인장하중하에서의 파괴거동에 따른 음향방출신호 특성에 관한 연구)

  • Lee, Kyung-Won;Lee, Sang-Yun;Nam, Jun-Young;Lee, Jong-Oh;Lee, Sang-Yul;Lee, Bo-Young
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.18 no.4
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    • pp.51-58
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    • 2010
  • Recently, aerospace structures have lightweight trend in order to reduce the cost of fuel and system, Carbon Fiber Reinforced Plastic (CFRP) can give the ability to reduce weight at 20~50% as the substitution of metal alloy, and there are advantages such as high Non-rigid, specific strength and anti-corrosion, but it is difficult to prove its destruction properties due to heterogeneous structure and anisotropy. In this study we designed specimen, inducing distinguishing destructions of material (for example, matrix crack, fiber breakage, and delamination) by using the Carbon Fiber Reinforced Plastic (CFRP) which is used in a real aircraft, to apply acoustic emission technique to aerospace structures. And we gained data via tensile testing and acoustic emission technique, from which each fault signal was classified respectively by using AE parameters and waveform.

A Study on the Crack Characteristics of the Syntetic Fiber Reinforced Soil (섬유 보강토의 균열 특성 연구)

  • 송창섭
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.41 no.3
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    • pp.59-65
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    • 1999
  • This study has been performed to confirm the three dimensional effect of the crack reduction and the restrained effect of crack growth for the synthetic fiber reinforced soil. Two types of polyrpropylene fiber and low plastic clay(CL) were used for the test. And the test variable were fiber length and so on. The results of the study were summarized as follows ; 1) The mixing of synthetic fiber was effective in reducing crack growth due to adhesion between soil partlcles and synthetic fiber.l Especially initlal crack was delayed, as compared with the pure soil, for about 1 day in case of mono filament synthetic fiber and for about 1 or 2 days in case of fibrillated syntetic fiber. 2) As the content and length of synthetic fiber were increased , the effect of crack reduction was increased. It was found that 0.5% fibrillated synthetic fiber with 40mm length reinforced soil had about 3 times more effective than natural soils. 3) In case of the same fiber content and fiber length, the fibrillated synthetic fiber has nmore effective than the mono filament synthetic fiber for crack reduction.

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