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취성기지 복합재료에서 연성 단섬유의 함유량 및 형상에 관한 보강특성
신익재,이동주,Sin, Ik-Jae,Lee, Dong-Ju 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.1
The reinforcing effects of ductile short-fiber reinforced brittle matrix composites are studied by, measuring flexural strength, fracture toughness and impact energy as functions of fiber volume fraction and length. The parameters of fracture mechanics, K and J are applied to assess fracture toughness and bridging stress. It is found that fracture toughness is greatly, influenced by the bridging stress ill which fiber pull-out is occur. For the reinforcing effects as functions of fiber volume fraction($V_f$ = 1, 2, 3 %) and length(L = 3, 6. 10cm), the flexural strength is maximum at $V_f$ = 1% and both fracture toughness.
고속압밀법에 의해 제작된 유리섬유강화 PET 기지 복합재료의 최적제작조건
이동주,신익재,김홍건,Lee, Dong-Ju,Sin, Ik-Jae,Kim, Hong-Geon 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.5
Glass fiber reinforced PET matrix composite was manufactured by rapid press consolidation technique as functions of temperature, pressure and time in pre-heating, consolidation and solidification stages. The optimal manufacturing conditions for this composite were discussed based on the void content, tensile, interlaminar shear and impact properties. In addition, the levels of crystallinity with various manufacturing conditions were measured using differential scanning calorimetry to investigate the mechanical properties of this composite material as a function of crystallinity. Among many processing parameters, the mold temperature and the cooling rate after forming were found to be the most critical factors in determining the level of crystallinity and mechanical properties. The level of crystallinity affects the tensile properties to some degree. However, impact properties are affected much more. It also affects the degree of ductility, which determines the impact energy of this material.
김형민(Hyung Min Kim),위신환(Shin Hwan Wei),윤신일(Sin Il Yoon),신익재(Ik Jae Shin),김규로(Gyu Ro Kim) 한국신뢰성학회 2013 신뢰성응용연구 Vol.13 No.1
In order to assess the reliability of engine mount for a vehicles, life test model and procedure are developed. By using this method, failure mechanism and life distribution are analyzed. The main results are as follows; i) the main failure mechanism is degradation failure of engine mount rubber by fatigue failure at dynamic load. ii) temperature is a second factor to affect a failure. iii) the life distribution of engine mount module is fitted well to Weibull life distribution and the shape parameter is 18.4 and the accelerated life model of that is fitted well to Arrhenius model.