• 제목/요약/키워드: fiber-reinforced material

검색결과 1,160건 처리시간 0.038초

강섬유보강 콘크리트의 휨인장강도 특성을 고려한 휨강성 평가 (Evaluation of Flexural Stiffness Considering Flexural Tensile Strength of Steel Fiber Reinforced Concrete)

  • 홍건호;정승원
    • 대한건축학회논문집:구조계
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    • 제35권8호
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    • pp.131-138
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    • 2019
  • Since concrete has a low tensile strength compared to the compressive strength, reinforced concrete flexural members represent easy crack occurance under a small load. In order to overcome this problem, steel fiber reinforced concrete has been developed to compensate the tensile strength and brittleness of members. However, in the design formula of the domestic building code, it is not specified in the design formula reflecting the material characteristics. Therefore, the field application of the steel fiber reinforced concrete have had many restrictions. In this study, a flexural tensile strength model of steel fiber reinforced concrete is proposed by collecting and analyzing the material properties of material test results conducted by various researchers, and verified by the test results of cracking and stiffness evaluation of flexural members based on the proposed model. As a result of this study, the flexural tensile strength model of steel fiber reinforced concrete which can reflect the mixing ratio and aspect ratio of the steel fiber was proposed and the validity of the proposed material model equation was evaluated from the load-deflection relationship in the flexural test of the slab member.

섬유 혼입 비율에 따른 섬유보강 콘크리트의 재료특성 (Material property of fiber reinforced concrete according to the fiber blended ratio)

  • 박춘근;김남호;이종필;김학연
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
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    • pp.632-635
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    • 2004
  • In this paper, material property of fiber reinforced concrete(FRC) according to the steel fiber, glass fiber and carbon fiber blended ratio. The fiber reinforced concretes are increased mechanical strength, because the fibers are dispersed with randomly direction and disturb crack progression in concretes. Adhesive fracture is occurred slowly at interface between fiber and concrete, and the fracture energy is absorbed due to softening phenomenon.

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고성능 하이브리드 섬유보강 콘크리트의 압축 및 인장 거동에 대한 재료모델 (Material Model for Compressive and Tensile Behaviors of High Performance Hybrid Fiber Reinforced Concrete)

  • 권순오;배수호;이현진
    • 한국건설순환자원학회논문집
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    • 제9권3호
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    • pp.311-321
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    • 2021
  • 콘크리트의 낮은 인장강도와 취성적인 특성 등의 약한 재료 특성을 개선하기 위하여 수년간 하이브리드 섬유보강 콘크리트에 관한 많은 연구가 진행되어 왔다. 그러나 비정질 강섬유와 유기섬유를 이용한 하이브리드 섬유보강 콘크리트의 특성에 관한 연구는 미진한 실정이다. 본 논문의 목적은 비정질 강섬유와 폴리아미드 섬유를 이용한 고성능 하이브리드 섬유보강 콘크리트의 압축 및 인장 거동을 평가한 후 이들에 대한 재료모델을 제안하는 것이다. 이를 위하여 목표 압축강도 40MPa 및 60MPa 각각에 대해서 비정질 강섬유와 폴리아미드 섬유를 총 부피비 1.0%로 설정하여 섬유 조합별로 고성능 하이브리드 섬유보강 콘크리트를 제작한 후, 압축 거동 및 인장 거동을 평가하였다. 고성능 하이브리드 섬유보강 콘크리트의 실험결과를 바탕으로 압축 및 인장거동에 대한 재료모델을 제안하였으며, 제안한 모델은 실험결과와 비교적 잘 일치하는 것으로 나타났다.

Performance Evaluation of Sprayed Ductile Fiber-Reinforced Mortar as a Repairing Material

  • Kang, Su-Tae;Koh, Kyung-Taek;Ryu, Gum-Sung;Kim, Jin-Soo;Han, Cheon-Goo
    • International Journal of Concrete Structures and Materials
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    • 제2권1호
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    • pp.27-33
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    • 2008
  • Most of existing repair materials have some shortcomings such as brittle fracture, imperfect interface bonding and marked difference in modulus of elasticity compared with the structures. These problems make their repair inefficient. Some researches on using a fiber-reinforced mortar as an alternative to enhance the efficiency have been carried out recently. This paper presents the results of an experimental study on the performance of sprayed PVA fiber-reinforced mortar as a repair material. We evaluated its mechanical properties, durability and strengthening effect. This study shows that the sprayed PVA fiber-reinforced mortar is remarkably effective as a repair material.

Fiber Reinforced Framework를 이용한 Implant 수복증례 (Implant Restorations Using Fiber Reinforced Framework)

  • 송호용;이양진;조리라
    • 대한심미치과학회지
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    • 제10권2호
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    • pp.21-30
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    • 2001
  • Fiber reinforced materials have favorable mechanical properties. Moreover, the strength to weight ratios of this material is superior to those of most alloys. Comparing to the metals, it showed many other advantages as well, including non-corrosiveness, translucency and easy repair characteristic. Since, it has the potential for the chair-side and laboratory fabrication, it is not surprising that fiber reinforced composites offer the potential for use in various applications in dentistry. To make the well-fitted restorations, Fiber reinforced composite (FRC) has been suggested as an alternative framework material for the implant supported fixed prosthesis. Two fixed partial denture fabrication procedures were tried. Vectris fiber was pressed to the EsthetiCone gold cylinder on the implant positioned cast. And then, Targis were added on it. In the other method, we used the customized component using UCLA abutment. The beads for retaining the Vectris fiber were added on the abutment. If careful laboratory and clinical techniques were done, these two techniques would fulfill the demands of the esthetics and strength.

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균질화 접근법을 통한 복합재의 유효물성치 계산 (Effective Material Properties of Composite Materials by Using a Numerical Homogenization Approach)

  • 아닉 다스 안토;조희근
    • 한국기계가공학회지
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    • 제18권12호
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    • pp.28-37
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    • 2019
  • Due to their flexible tailoring qualities, composites have become fascinating materials for structural engineers. While the research area of fiber-reinforced composite materials was previously limited to synthetic materials, natural fibers have recently become the primary research focus as the best alternative to artificial fibers. The natural fibers are eco-friendly and relatively cheaper than synthetic fibers. The main concern of current research into natural fiber-reinforced composites is the prediction and enhancement of the effective material properties. In the present work, finite element analysis is used with a numerical homogenization approach to determine the effective material properties of jute fiber-reinforced epoxy composites with various volume fractions of fiber. The finite element analysis results for the jute fiber-reinforced epoxy composite are then compared with several well-known analytical models.

SiC Fiber 강화 다공질 반응 소결 탄화규소 Composite의 제조 및 기계적 특성 (Fabrication of SiC Fiber Reinforced Porous Reaction Bonded SiC Composite and Its Mechanical Properties)

  • 한재호;박상환
    • 한국세라믹학회지
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    • 제43권8호
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    • pp.509-514
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    • 2006
  • In this study, chopped Hi-Nicalon SiC fiber Reinforced Porous Reaction Bonded SiC (RBSC) composites and it fabrication process were developed by using Si melt infiltration process. The porosity and average pore size in fabricated chopped SiC fiber reinforced porous RBSC composites were in the range of $30{\sim}40%$ and $40-90{\mu}m$, which mainly determined by the SiC powder size used as starting material and amount of residual Si in porous composites. The maximum flexural strength of chopped SiC fiber reinforced porous RBSC composite was as high as 80 MPa. The delayed fracture behavior was observed in chopped SiC fiber reinforced porous RBSC composites upon 3-point bending strength test.

서프보드 적용을 위한 하이브리드 복합재료의 열적 특성 (Thermal Characteristics of Hybrid Composites for Application to Surfboard)

  • 김윤해;이진우;박창욱;박수정
    • 한국해양공학회지
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    • 제28권4호
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    • pp.351-355
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    • 2014
  • Today, carbon fibers are used as heating elements. Carbon fibers are generally used to reinforce composite materials because they are lightweight and have a high strength and modulus. Carbon fiber reinforced composite materials are used for aerospace, automobile, and wind turbine blade applications. This work explored the possibility of using carbon fiber reinforced composite materials as self heating materials. The temperatures of the carbon fiber reinforced composites were measured. These results verified that the carbon fiber reinforced composite materials could be used as heating elements. A glass fiber was laminated using various methods. The thermal characteristics of the composites were evaluated. This confirmed that the generation of heat varied according to the lamination thicknesses of the carbon fiber and glass fiber. As the number of carbon fiber laminations increased, the heat-generating temperature increased. In contrast, as the number of glass fiber laminations increased, the amount of heat decreased. The generation of heat and ability to remain warm could be controlled by controlling the carbon fiber and glass fiber laminations.

섬유 보강 시멘트 복합체의 시공성 향상에 관한 연구 (A Study on the Improvement for Construction Performance of Fiber Reinforced Cementitious Composites)

  • 고경택;박정준;류금성;강수태;안기홍
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2006년도 춘계 학술발표회 논문집(II)
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    • pp.393-396
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    • 2006
  • This study present the experimental research investigating the influence of material factors such as a type or amount of superplasticizer, velocity agent, mineral admixture and steel fiber on the construction performance of fiber reinforced cementitious composites. As for the test results, it was found that the workability of fiber reinforced cementitious composites can be improved when the material factors were matched properly in amount and composition. Furthermore, it was shown that the smaller value of the aspect ratio of fiber improved the workability of fiber reinforced cementitious composites. And the fiber reinforced cementitious composites with better workability showed the enhanced compressive strength and flexural strength.

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