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저온ㆍ고온고습 환경시험에 의한 GFRP의 미시계면 접착상태 및 노치형상강도 특성에 관한 연구
김옥만(Yok-Man Kim),박귀성(Gue-Seung Park),한길영(Gil-Young Han),이동기(Dong-Gi Lee),김이곤(E-Gon Kim) 한국해양공학회 1996 韓國海洋工學會誌 Vol.10 No.4
The purpose of this investigation is to estimate the strength with the variations of the notch shape and the adhesive condition at the fiber/matrix micro interface of E-glass/PP laminates. To promote the degradation of the adhesive condition at the fiber/matrix micro interface without matrix dissolution loss, low-, hot-wet and spiking tests were carried out. The absorption properties and the tensile properties were compared according to the fiber orientation and the content.<br/> The results show that, firstly, saturated moisture absorption was reached at 5cycles and their absorptions of RD-40, UD-42 and UD-50 are 0.68%, 0.63%, 0.60%, respectively.<br/> Secondly, all the specimens investigated were mostly degraded at 5cyc1e, whereas UD-50 having ellipse shaped notch the least decrement of strength.
흡습효과가 섬유강화 고분자 복합재료의 압축ㆍ굽힘 잔류강도에 미치는 영향
김혁(Hyuk Kim),한길영(Gil-Young Han),이동기(Dong-Gi Lee),김이곤(E-Gon Kim),김기성(Ki-Sung Kim) 한국해양공학회 1995 韓國海洋工學會誌 Vol.9 No.2
This paper deals with the residual strength characteristics of composite materials under the environment of high temperature and humidity. Two types of GFRP, one with unidirection and randomly oriented, are used to investigate the features of moisture absorption and the residual strength.<br/> The results show that, when exposed longterms in high temperature and humidity, the randomly oriented composites is more stable than the unidirection one.
단섬유강화 고분자 복합재료의 압축성형에 있어서 섬유배향에 관한 연구
김혁(Hyuk Kim),전상기(Sang-Ki Jeon),이동기(Dong-Gi Lee),한길영(Gil-Yong Han),김이곤(E-Gon Kim) 한국해양공학회 1996 韓國海洋工學會誌 Vol.10 No.3
In this study basic equations of fiber orientations is compared with experimental results It is found that fiber orientations of short fiber reinforced polymeric composite under compression molding are governed by slope of flow speed in x-y direction. Fiber orientation angle of mold is also found to increase with closure speed and the compression ratio. At the middle of the mold, the slope of flow speed is larger in x-direction than in y-direction. At the wall of the mold, the slope of flow speed in y-direction occurs due to the effect of friction, hence affects the fiber orientation. The effect of partial flow, which incurs y-direction orientation causes to increase the fiber orientation angle at the fore part of the flow.
섬유강화 플라스틱 복합재의 압축성형에 있어서 이방성과 금형-재료계면의 미끄럼을 고려한 3차원 유한요소해석
윤두현,조선형,김이곤,Yoon, Doo-Hyun,Jo, Seon-Hyung,Kim, E-Gon 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.7
The family of unidirectional continuous fiber reinforced polymeric composites are currently used in automotive bumper beams and load floors. The material properties and mechanical characteristics of the compression molded parts are determined by the curing behavior, fiber orientation and formation of knit lines, which are in turn determined by the mold filling parameters. In this paper, a new model is presented which can be used to predict the 3-dimensional flow under consideration of the slip of mold-composites and anisotropic viscosity of composites during compression molding of unidirectional fiber reinforced thermoplastics for isothermal state. The composites is treated as an incompressible Newtonian fluid. The effects of longitudinal/transverse viscosity ratio A and slip parameter $\alpha$ on the buldging phenomenon and mold filling patterns are also discussed.