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SP-100 알루미늄 분말 에폭시의 경도 및 압축 강도 평가
한정영(Jeong-Young Han),김명훈(Myung-Hun Kim),강성수(Sung-Soo Kang) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.9
본 연구에서는 SP-100 알루미늄 분말 에폭시의 경도 및 압축강도를 평가하기 위해, 후경화 조건을 달리한 5 종류의 시편에 대해 온도별 경도 측정 시험과 압축강도시험을 수행하였다. 온도별 표면경도시험 결과, 후경화 온도가 높을수록 경도가 높게 나타나는 것을 확인하였다. 특히, Case 3 과 Case 4 의 경우가 다른 Case 의 시편에 비해 상대적으로 높은 경도를 보임을 알 수 있었다. 압축시험을 통한 시편의 압축강도는 후경화를 실시한 시편들이 비교적 유사한 강성 및 강도를 나타내었으며 미실시한 시편은 열가소성 수지와 같은 압축응력곡선을 나타내었다. In this study, we performed experimental tests on five SP-100 aluminum powder epoxy specimens with several after-curing conditions in order to estimate their hardness with temperature and compressive strength. In the surface hardness test, it was found that the higher the after-curing temperature, the higher was the hardness. In particular, it was found that the hardness of the specimens in cases 3 and 4 was much higher than in the other cases. In addition, in the compression tests carried out to evaluate the compressive strength, it was found that the specimens showed relatively similar stiffness and strength with after-curing, and specimens with no after-curing showed compression stress-strain curves similar to those of thermoplastic resins.
대형 풍력발전용 필라멘트 와인딩 복합재 타워의 좌굴 해석
한정영(Jeong-Young Han),홍철현(Cheol-Hyun Hong) 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.2
The purpose of this study was to investigate the buckling load of filament-wound composite towers for large scale wind-turbines using the finite element method (FEM). To define the material properties, we used both the effective property method and stacking properties method. The effective properties method assumes that a composite consists of one ply. The stacking properties method assumes that a composite consists of several stacked plies. First, a linear buckling analysis of the tower, filament-wound with angles of [±30], was carried out using the two methods for composite material properties: the stacking method and effective method. An FE analysis was also performed for the composite towers using the filament winding angles of [±30], [±45], and [±60]. The FE analysis results using the stacking properties of the composite were in good agreement with the results from the effective properties method. The difference between the FEM results and material. properties method was approximately 0~2.3%. Above the angle of [±60], there was little change in the buckling load.
대형 해상풍력발전용 필라멘트 와인딩 복합재 타워의 동적 특성에 관한 연구
한정영(Jeong-Young Han),홍철현(Cheol-Hyun Hong),정재훈(Jae-Hun Jeong),문병영(Byong-Young Moon) 한국유체기계학회 2011 유체기계 연구개발 발표회 논문집 Vol.2011 No.11
The purpose of this study is to investigate the buckling load of filament-wound composite towers for large scale wind-turbine using finite element method(FEM). To define material properties, we used both the effective property method and the stacking properties method. The effective properties method is to assume that composite consists of one ply. The stacking properties method is to assume that composite consists of some stacked plies. First, linear buckling analysis of the tower, filament-wounded with angles of [±30] was carried out by two methods for composite material properties, the stacking method and the effective method. and FE analysis was performed for the composite towers according to filament winding angles of [±30], [±45], [±60]. FE analysis results using the stacking properties of the composite were in good agreement with the results by the effective properties. The difference between FEM results by material properties methods was approximately 0~2.3% in buckling Analysis and approximately 0~ 0.6% in modal analysis. And above the angle of [±60], there was a little change of buckling load.
경량화 복합재를 이용한 풍력 블레이드 개발과 해석에 관한 연구
강병윤,한정영,홍철현,문병영,Kang, Byong-Yun,Han, Jeong-Young,Hong, Cheol-Hyun,Moon, Byung-Young 한국유체기계학회 2011 한국유체기계학회 논문집 Vol.19 No.6
Wind turbine blades will be required to be longer, lighter, more reliable and more consistent. Therefore it is necessary to lose weight of the wind turbine blades. This points squarely toward prepreg blade production growing. It is important to note however that prepreg blade production as it is today is flawed and that there are ways to improve greatly on the performance of these blades in manufacturing process and in their in-service performance. Through this, we have some detail on the current process and its advantage of cost and weight of blades.