• 제목/요약/키워드: Epoxy resin reinforced glass fiber composites

검색결과 27건 처리시간 0.023초

유리섬유강화 에폭시 레진 복합체의 기계적, 유전체 특성에 미치는 첨가제 함유 에폭시 영향 (Effect of Additive-added Epoxy on Mechanical and Dielectric Characteristics of Glass Fiber Reinforced Epoxy Composites)

  • ;;;최형진
    • 폴리머
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    • 제38권6호
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    • pp.726-734
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    • 2014
  • Three different types of additives, thiokol, epoxidized natural rubber (ENR) and epoxidized linseed oil (ELO), were dispersed in an epoxy matrix before being used in glass fiber (GF) composites, and their effects on the mechanical and dielectric properties of epoxy resin and glass fiber reinforced epoxy composites (GF/EP) were examined. The addition of each of 7 phr ENR, 9 phr ELO and 5 phr thiokol into the epoxy resin increased the fracture toughness significantly by 56.9, 43.1, and 80.0%, respectively, compared to the unmodified resin. The mode I interlaminar fracture toughness of the GF/EP at propagation was also improved by 26.9, 18.3 and 32.7% when each of 7 phr ENR, 9 phr ELO, and 5 phr thiokol, respectively, was dispersed in the epoxy matrix. Scanning electron microscopy showed that the additives reduced crack growth in the GF/EP, whereas their dielectric measurements showed that all these additives had no additional effect on the real permittivity and loss factor of the GF/EP.

Prediction of Deterioration Rate for Composite Material by Moisture Absorption

  • Kim, Yun-Hae;An, Seung-Jun;Jo, Young-Dae;Bae, Chang-Won;Moon, Kyung-Man
    • Journal of Advanced Marine Engineering and Technology
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    • 제34권2호
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    • pp.296-302
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    • 2010
  • If the fiber reinforced plastic is exposed to the moisture for a long period of time, most of moisture absorption occurs on the resin place, thus dropping cohesiveness between the molecules as the water molecules permeated between high molecular chains grant high molecular mobility and flexibility. Also as the micro crack occurs due to the permeation of moisture on the interface of glass fiber and epoxy resin, it is developed to the overall damage of interface place. Hence, the study on absorption is essential as the mechanical and physical properties of fiber reinforced composites are reduced. However, the study on absorption has the inconvenience needing to expose composite materials to fresh water or seawater for 1 month or up to 1 year. Therefore, this study has exposed fiber reinforced composites to fresh water and has developed a model with an accuracy of 98% after comparing the analysis value obtained by using ANSYS while basing on the experimental value of property decline by absorption and the basic properties of glass fiber and epoxy resin used in the experiment.

섬유강화 복합재료에서 섬유열화에 따른 계면특성의 변화 (Change of Interfacial properties by the Fiber Degradation in the Fiber Reinforced Composites)

  • 문창권;김영대;노태영
    • 한국해양공학회지
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    • 제12권3호통권29호
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    • pp.31-41
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    • 1998
  • Single fiber fragmentation technique was used to evaluate the change of interfacial properties by degradation of fiber tensile strength in the fiber reinforced composites. The influences of fiber tensile strength on the interfacial properties have been evaluated by the fragmentation specimens(weak fiber samples) of glass fiber/epoxy resin that was made using the pre-degraded glass fiber in distilled water at $80^{circ}C$ for specified periods. The effects of the immersion time on the interfacial properties in the distilled water at $80^{circ}C$ also have been evaluated by the fragmentation specimens(original fiber samples) of glass fiber/epoxy resin that was made using the received glass fiber. As the result, the tensile strength of glass fiber was decreased with the increasing of the treatment time in the distilled water at $80^{circ}C$ and the interfacial shear strength was independent of the change of the glass fiber strength in the single fiber fragmentation test. But in the durability test using the single fiber fragmentation specimen, interfacial shear strength decreased with the increasing of the immersion time in distilled water ar $80^{circ}C$. And it turned out that the evaluating of interfacial shear strength using original fiber tensile strength was valuable in the durability test for the water environment by the single fiber fragmentation technique.

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셀 방법을 이용한 3차원 원형 브레이드 유리 섬유 강화 복합 재료의 구성 방정식 (Constitutive Equations for Three Dimensional Circular Braided Glass Fiber Reinforced Composites Using Cell Modeling Method)

  • 이원오;정관수
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2003년도 추계학술발표대회 논문집
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    • pp.71-74
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    • 2003
  • The cell modeling homogenization method to derive the constitutive equation considering the microstructures of the fiber reinforced composites has been previously developed for composites with simple microstructures such as 2D plane composites and 3D rectangular shaped composites. Here, the method has been further extended for 3D circular braided composites, utilizing B-spline curves to properly describe the more complex geometry of 3D braided composites. For verification purposes, the method has been applied for orthotropic elastic properties of the 3D circular braided glass fiber reinforced composite, in particular for the tensile property. Prepregs of the specimen have been fabricated using the 3D braiding machine through RTM (resin transfer molding) with epoxy as a matrix. Experimentally measured uniaxial tensile properties agreed well with predicted values obtained fer two volume fractions.

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Constitutive Equations Based on Cell Modeling Method for 3D Circular Braided Glass Fiber Reinforced Composites

  • Lee, Wonoh;Kim, Ji Hoon;Shin, Heon-Jung;Chung, Kwansoo;Kang, Tae Jin;Youn, Jae Ryoun
    • Fibers and Polymers
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    • 제4권2호
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    • pp.77-83
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    • 2003
  • The cell modeling homogenization method to derive the constitutive equation considering the microstructures of the fiber reinforced composites has been previously developed for composites with simple microstructures such as 2D plane composites and 3D rectangular shaped composites. Here, the method has been further extended for 3D circular braided com-posites, utilizing B-spline curves to properly describe the more complex geometry of 3D braided composites. For verification purposes, the method has been applied for orthotropic elastic properties of the 3D circular braided glass fiber reinforced com-posite, in particular for the tensile property. Prepregs of the specimen have been fabricated using the 3D braiding machine through RTM (resin transfer molding) with epoxy as a matrix. Experimentally measured uniaxial tensile properties agreed well with predicted values obtained for two volume fractions.

Capillary 특성을 활용한 섬유 조건에 따른 유리섬유강화 복합재료의 함침성 및 계면강도 평가 (Evaluation of Wettability and Interfacial Property of Glass Fiber Reinforced Composite with Different Glass Fiber Conditions via Capillary Effect)

  • 김종현;권동준;박종만
    • Composites Research
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    • 제34권5호
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    • pp.305-310
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    • 2021
  • 섬유강화복합재료의 기계적물성은 섬유의 체적분율 및 사이징제 조건에 의한 계면강도에 영향을 받는다. 최적의 계면은 기지층에서 강화재로의 기계적 응력을 효과적으로 전달하여 응력 집중을 완화하고 결과적으로 복합재료의 성능을 향상시킬 수 있다. 본 논문에서는 사이징제 조건 및 섬유체적분율에 따른 에폭시 수지와 유리섬유 간의 젖음성 및 계면강도를 평가하였다. 정적 및 동적접촉각을 이용하여 사이징제가 다른 유리섬유와 에폭시 수지의 표면에너지를 계산하였고, 이를 활용하여 접착일을 계산하였다. 유리섬유 토우 캐필러리 시험법을 이용하여 젖음성을 평가하였고, 마이크로드롭렛 인발시험을 통해 계산된 계면전단강도를 이용하여 계면강도를 평가하였다. 최종적으로 젖음성과 계면강도를 활용하여 최적의 유리섬유강화 복합재료 제작 조건을 확인하였다.

황마섬유 보강 열경화성 복합재료의 기계적 특성 (Mechanical Properties of Jute Fiber Reinforced Thermosetting Composites)

  • 이창훈;송재은;남원상;변준형;김병선;황병선
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2005년도 춘계학술발표대회 논문집
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    • pp.111-115
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    • 2005
  • Recently, natural fibers draw much interests in composite industry due to low cost, light weight, and environment-friendly characteristics compared with glass fibers. In this study, mechanical properties were evaluated for two extreme cases of jute fiber orientations, i.e. the unidirectional yarn composites and the felt fabric composites. Samples of jute fiber composites were fabricated by RTM process using epoxy resin, and tensile, compression, and shear tests were conducted. As can be expected, unidirectional fiber specimens in longitudinal direction showed the highest strength and modulus. Compared with glass/epoxy composites of the similar fabric architecture and fiber volume fraction, the tensile strength and modulus of jute felt/epoxy composites reached only 40% and 50% levels. However, the specific tensile strength and modulus increased to 80% and 90% of the glass/epoxy composites. The main reason for the poor mechanical properties of jute composites is associated with the weak interfacial bonding between fiber and matrix. The effect of surface treatment of jute fibers on the interfacial bonding will be examined in the future work.

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반응성 플라즈마 표면처리기법을 도입한 새로운 유리섬유 강화 복합재료의 개발 및 물성연구(II) (Developement of New Glass Fiber Reinforced Composite Insulating Material by Reactive Plasma Surface Treatment(II))

  • 박정후;조정수;성문열;김두환;김규섭
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1995년도 춘계학술대회 논문집
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    • pp.216-219
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    • 1995
  • One of the principal problems encountered in the use of glass fiber reinforced Plastic composites(GFRP) is to establish an active fiber surface to achieve maximum adhesion between resin and fiber surface. In order to develope new process to overcome the disadvantage of chemical agent, we have studied the effect of reactive plasma glass surface treatment on the electrical and mechanical properties of glass fiber reinforced epoxy composites. It is found that the electrical and mechanical characteristics of the composites treated with plasma is improved especially in the dielectric strength by 20% and tensile strength by 15%, whereas the tan $\delta$ is decreased significantly.

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부식 환경 하에서의 섬유강화복합재료의 마찰 및 마모 특성 연구 (A Study on the Frictional Characteristics of Fiber Reinforced Composites under Corrosive Environment)

  • 박충용;박동현;박수정;김윤해
    • Composites Research
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    • 제36권1호
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    • pp.37-41
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    • 2023
  • 선박의 평형수처리장치 전해조 내부 용액은 해수를 전기분해 시 DSA(Dimension Stable Anode) 전극에서 생성되는 수산화물로 인하여 높은 알칼리성 분위기를 생성한다. 본 연구에서는 기존 평형수처리장치 배관에 사용되어지는 PE 코팅 강관 배관의 취약성을 대체 가능한 복합재료로써 4가지 소재를 선정하였으며, 이들 BRE(Basalt fiber reinforced epoxy), BRP(Basalt fiber reinforced unsaturated polyester), GRE(Glass fiber reinforced epoxy), GRP(Glass fiber reinforced unsaturated polyester)를 강 알칼리성 NaOH 용액에 720시간 침지 후 마찰 및 마모 시험을 통하여 재료 마찰 깊이에 따른 마찰계수와 섬유와 수지 간 계면 결합 거동을 분석하였다. 그 결과, 수지와 섬유 간의 게면 분리 현상에 대한 메커니즘을 도출하였다. 또한, 불포화폴리에스테르와 같이 상대적으로 낮은 계면 결합력의 갖는 소재의 경우, 알칼리성 용액에 침지 시간이 길어질수록 표면에서부터 시작된 열화가 내부로 급격하게 확산되어 마찰 계수의 감소로 이어지는 경향을 나타냈다.

가압 겔화법에 의한 에폭시 복합 재료의 유전적 특성 (Dielectric Properties of Glass Fiber Reinforced Epoxy Composites by Cure under Pressure)

  • 곽영순;신중홍;박정후
    • 대한전기학회논문지
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    • 제38권4호
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    • pp.292-297
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    • 1989
  • To achieve fiber/resin reinforced composites with high quality (void-free, uniform compaction), a basic understanding of the principal factors related to a thermal cycle to cure the matrix and a pressure to compact the system is necessary. In this paper, some dielectric and mechanical properties of glass cloth reinforced epoxy composites are measured as a function of fabrication conditions, where the time that the pressure is applied to the sample during the cure process is controlled. Both the tensile strength and frequency characteristics of the sample are improved significantly when the pressure is applied at the start point of gelling.

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