• 제목/요약/키워드: polypropylene fiber

검색결과 576건 처리시간 0.024초

섬유함유율에 따른 GF/PP 복합재료의 인장파괴거동 (Tensile Fracture Behavior of Glass Fiber/Polypropylene Composites for Various Fiber Volume Fraction)

  • 고성위;엄윤성
    • 수산해양기술연구
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    • 제40권2호
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    • pp.161-165
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    • 2004
  • The main goal of this work is to study the effect of glass fiber volume fraction on the result of tensile test with respect to glass fiber/polypropylene(GF/PP) composites. The tensile test and failure mechanisms of GF/PP composites were investigated in the fiber volume fraction range from 10% to 30%. The tensile strength and the fracture strength increased with the increasing of the fiber volume fraction in the tested range. Fiber pull-out and debonding of this composites increased with the fiber volume fraction in thc tested range. The major failure mechanisms were classified into the debonding, the fiber pull out, the delamination and the matrix deformation.

고인성 섬유보강 복합체 내에서 폴리프로필렌 섬유의 계면 부착성능 (Interfacial Properties of Polypropylene Fiber in High Performance Fiber Reinforced Cement Composites)

  • 한병찬;전에스더;박완신;이영석;복산양;윤현도
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
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    • pp.108-111
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    • 2004
  • The polypropylene(PP) fiber is poised as a low cost alternative for reinforcement in structural applications in comparison with other high performance fibers, such as the polyvinyl-alcohol(PVA), polyethylene, carbon and aramid fiber. The mechanical properties of the composite are strongly determined by the interfacial behavior of fiber and cementitious matrix. The crack bridging mechanism contribute to composite toughness from activation of the fiber-matrix interface where energy is dissipated through debonding of the interface and fiber pullout. In this study, therefore, the pullout behavior of PP fibers is investigated. Experimental work includes the investigation of the interfacial properties, and the composite property. The quantification of interfacial properties, the frictional bond is achieved through single fiber pullout test. A study on the effect of inclination angle on fiber pullout behavior is also conducted.

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섬유혼합보강토의 일축강도 특성 (Unconfined Strength Characteristics of Fiber Reinforced Soil)

  • 장병욱
    • 한국농공학회지
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    • 제41권1호
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    • pp.72-78
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    • 1999
  • The purpose of this study was to evaluate the properties of unconfined strength of dry soil which was reinforced with polypropylene fiber. It is found that unconfined compressive strength and strain of dry soil without fiber were decreased as water content was increased. As mixing ration of fiber was increased , unconfined compressive strength and failure strain of dry soil reinforced with polypropylene fiber were increased. When mixing ration was larger than 0.5 % , unconfined compressive strength was gradually increased. The longer fiber was, the largest post peak strength was obtained and the larger strain was reached. Tensile strength of dried fiber reinforced soil was larger than that of dry soil without fiber.

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나일론 섬유보강 콘크리트의 물리적 특성 및 모르타르 소성수축균열 제어성능 평가 (Evaluation of the Properties of Nylon Fiber Reinforced Concrete and the Performance in Plastic Shrinkage Cracking Reduction)

  • 김광련;권용주;백인상;김용태;김병기
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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    • pp.575-578
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    • 2005
  • Recently, various concrete reinforcing fibers have been used to reduce the plastic shrinkage cracking which occurs before the concrete hardens. In this study, the physical properties of nylon fiber reinforced concrete such as slump, air content, compressive strength and tensile strength were investigated. In addition, the performance of nylon fiber in the plastic shrinkage cracking reduction of mortar has been estimated in comparison with polypropylene fiber and cellulose fiber. Nylon fiber showed considerable advantages in terms of the workability of concrete and the plastic shrinkage cracking reduction of mortar compared with polypropylene fiber and cellulose fiber.

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Compressive Properties of Amorphous Metal Fiber Reinforced Concrete Exposed to high Temperature

  • Lee, Jun-Cheol;Kim, Wha-Jung;Lee, Chang-Joon
    • 한국건축시공학회지
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    • 제12권2호
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    • pp.183-193
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    • 2012
  • Compressive property of high strength concrete with amorphous metal fibers subject to high temperature has been investigated. The measure of this investigation includes explosive spalling, weight loss, residual compressive strength, strain at peak stress, elastic modulus, and residual energy absorption capacity after exposure to $400^{\circ}C$, $600^{\circ}C$and $800^{\circ}C$. In addition to the amorphous metal fiber, two other types of fibers (polypropylene fiber and hooked-end steel fiber) were also included in this investigation for comparison. The experimental program was conducted with high strength concrete using several combinations of the fiber types. The testing result shows that the concrete with amorphous metal fibers plus polypropylene fibers shows a superior behavior than those using other combination or single fiber type ingredient.

섬유보강 실트질 모래의 동적 변형특성 (Dynamic Deformation Characteristics of Fiber Mixed Silty Sand)

  • 허준;장병욱
    • 한국농공학회논문집
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    • 제47권6호
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    • pp.59-70
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    • 2005
  • A series of resonant column test was performed to investigate the dynamic deformation characteristics of silty sand soils mixed with polypropylene fibrillated type fiber. Results show that optimum mixing ratios were $0.2\%$ for 19mm of cut fiber for shear modulus and $0.1\%$ for 60mm cut fiber fur damping ratio. As shear strain was increased, normalized values of shear modulus (G(Reinforced)/ G(Unreinforced)) of fiber reinforced soil were increased up to $10^{-3}\%\~10^{-1}\%$ ranges. However, normalized damping ratio (D(Reinforced/D(Unreinforced)) was diminished with an increase in strain beyond $10^{-3}\%\~10^{-1}\%$ for the damping capacity of soils mixed with fiber. Normalized shear modulus $(G/G_{max})$ obtained from the test was plotted in the chart suggested by Seed and Idriss. The shear modulus of silty sand was located between sand and gravel curves.

소성수축균열 저감을 위한 나일론 섬유보강 콘크리트의 현장적용에 관한 연구 (Study for Field Application of Nylon Fiber Reinforced Concrete for Plastic Shringage Crack Reduction)

  • 권용주;김광련;강동수;박성우
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2006년도 추계 학술발표회 논문집
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    • pp.661-664
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    • 2006
  • Recently, various concrete reinforcing fibers have been used to reduce the plastic shrinkage cracking which occurs before the concrete hardens. In this study, the physical properties of nylon fiber reinforced concrete such as slump, air content, compressive strength and tensile strength were investigated. In addition, the performance of nylon fiber in the plastic shrinkage cracking reduction of concrete has been estimated in comparison with polypropylene, poly vinyl alcohol fiber and cellulose fiber. Nylon fiber showed considerable advantages in terms of the workability of concrete and the plastic shrinkage cracking reduction of concrete compared with polypropylene fiber and cellulose fiber.

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스프레드 탄소섬유 직물 복합재료의 성형온도에 따른 기계적 특성에 관한 연구 (Effect of Fabricating Temperature on the Mechanical Properties of Spread Carbon Fiber Fabric Composites)

  • 은종현;곽재원;김기정;김민성;성선민;최보경;김동현;이준석
    • Composites Research
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    • 제33권3호
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    • pp.161-168
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    • 2020
  • 본 연구에서는 스프레드 기술이 적용된 열가소성 탄소섬유 복합재료의 성형 온도에 따른 기계적 특성과 폴리프로필렌 필름의 열적 특성에 대해 조사하였다. 스프레드 기술이 적용된 탄소섬유 직물과 범용 탄소섬유 직물로 탄소섬유 강화 복합재료를 제작하였고, 시차 열량 주사계(DSC), 열 중량 분석법(TGA), 점도계를 사용하여 폴리프로필렌 필름의 열적 특성을 측정하였다. 인장, 굽힘, 층간 전단 실험을 통해 복합재료 성형 온도 조건에 따른 스프레드 탄소섬유 복합재료(SCFC)와 범용 탄소섬유 복합재료(CCFC)의 기계적 특성을 확인하였다. 폴리프로 필렌 수지의 융점 이상인 200~240℃ 구간에서 복합재료를 제작하였으며, 주사 전자 현미경(SEM) 분석을 통해 성형 온도 조건에 따른 열가소성수지의 함침성을 관찰하였다. 그 결과, 성형 온도가 증가함에 따라 폴리프로필렌 수지의 점도가 감소하여 함침성이 향상되었으며, 230℃ 성형 온도 조건에서 기계적 특성이 가장 우수한 것을 확인하였다.

Mechanical Properties of Polypropylene Filaments Drawn on Varying Post Spinning Temperature Gradients

  • Mukhopadhyay, S.;Deopura, B.L.;Alagirusamy, R.
    • Fibers and Polymers
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    • 제7권4호
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    • pp.432-435
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    • 2006
  • High Modulus and high tenacity polypropylene fibers have been prepared by drawing on a gradient heater. Results show that fiber properties are significantly affected by temperature profiles of final stage drawing on a gradient heater. The gradient drawn filaments showed superior mechanical properties when compared to filaments drawn over a constant temperature heater. Fibers with initial modulus of 16.4 GPa and tenacity of 670 MPa have been manufactured in the process. The nature of the gradient drawing had a significant effect on end properties. The superior mechanical properties are attributed to the high crystal perfection and crystallinity and low void fractions obtained at high draw ratios when drawn over a gradient heater.

삼원색의 알킬치환 초소수성 염료에 의한 순수 폴리프로필렌 섬유의 실용적 염색 (The Practical Dyeing of Pure Polypropylene Fiber with Alkyl Substituted Three Primary Color Dyes)

  • 정종석;장경진;김태경;윤석한;김미경;최우혁
    • 한국염색가공학회:학술대회논문집
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    • 한국염색가공학회 2008년도 제39차 학술발표회
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    • pp.73-74
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    • 2008
  • Three primary color super hydrophobic dyes were used to dye unmodified polypropylene fiber for various practical color. The color values of the dyed fibers were displayed on CIE 1931 Yxy chromaticity diagram. It was found that they showed various colors between three primary colors on the unmodified polypropylene fiber.

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