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블랭킹 공정을 이용한 STS/Al 클래드 판재의 계면 접합력 측정에 관한 연구
김태호(T. H. Kim),김지훈(J. H. Kim),이광석(K. S. Lee),문영훈(Y. H. Moon),이영선(Y. S. Lee) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
The Clad sheet is made roll-bonding process of the one or more material with the different property. Good formability is an essential property in order to deform a clad metal sheet into a part or component. The performance of the clad sheet be considerably dependent at interfacial adhesion strength of between dissimilar materials because needs more research. In this study, were investigated the experiment variables when measured of interfacial bonding strength of STS/Al clad sheet by using the blanking process. Experimental variables are punch velocity, clearance and stacking sequence of the specimen. Also, were compared and analyzed with bonding strength as measured by T-peel test of standard peel test method. In addition, were compared at test results and FEM results by the blanking process by using the Sticking conditions of finite element analysis.
(60-x)SiO<sub>2</sub>-40Na<sub>2</sub>O-xCaO(x=0∼15wt%)조성유리계의 조성, 온도 및 전기전도도간의 상관특성
정영준,김영석,이규호,김태호,진현주,류봉기,Jung, Y.J.,Lee, K.H.,Kim, T.H.,Kim, Y.S.,Chin, H.J.,Ryu, B.K. 한국재료학회 2007 한국재료학회지 Vol.17 No.8
We report the electrical conductivity of the mixed alkali silicate glasses in the system (60-x)$SiO_2-40Na_2O-xCaO(x=0\sim15wt%)$ in the temperature range from $150^{\circ}C$ to $620^{\circ}C$. In the range from $150^{\circ}C$ to glass transition temperature$(T_g)$, the electrical conductivities of glass samples had a tendency to be proportion with temperature. The glasses of containing over 7.5wt% CaO showed lower conductivities than the glasses of containing 0 and 5wt% CaO because two kinds of alkali ions$(Na^+,\;Ca^{2+})$ were obstructed each other. On the other hand, in the range from $T_g$ to $620^{\circ}C$, the electrical conductivity of glasses($7.5{\leq}x{\leq}12.5$) was unstable and decreased in some region. From XRD results, the $Na_4Ca(SiO_3)_3$ phase were observed in these glasses. This means the alkali ions didn't behave as carrier, it seems that this caused the conductivities decrease. In case of glass of containing 15wt% CaO, any crystal phase were not observed. This means the alkali ions behaved as carrier, it consequently seems the conductivity increased.
Blanking 공정을 이용한 Clad 판재 접합력 측정
김태호(T. H. Kim),김지훈(J. H. Kim),이광석(K. S. Lee),문영훈(Y. H. Moon),이영선(Y. S. Lee) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
The Clad sheet is generally made with the one or more material with the different properties by roll-bonding process. Good formability is one of the essential properties to deform a clad metal sheet into a part or component. In this study, we conducted a study of a single material that is separated from the STS-A1 cladding sheet. The first, in order to get critical damage value(CDV) the tensile test results using sheet specimens are compared with FEM. Also, by using the FEM was investigated the effect of CDV. After then we compared the FEM analysis of a single material of clad sheet by using the CDV measured. FEM analysis and experiment were performed to measure bonding strength using the difference of punch load applied on fine blanking between multilayered sheet and simple stacking sheet.
파력발전용 웰즈터빈성능에 영향을 미치는 날개형상에 관한 연구
김태호(T.H. Kim),瀨戶口俊明(T. Setoguchi),김희동(H.D.Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Optimization of the Wells turbine requires a clear understanding of the blade geometry effect on its<br/> performance. The complicated interrelations among the major parameters associated with the turbine<br/> geometry, like solidity, hub-to-tip ratio, aspect ratio, blade sweep ratio, and so on, make the overall<br/> performance of the turbine blade highly difficult and unpredictable. In the present study, the effect of the<br/> blade geometry with the hub-to-tip and aspect ratios on the turbine performance was investigated by a<br/> computational technique. In computation, the 3-dimensional, steady, incompressible, Reynolds-Averaged<br/> Navier-Stokes(RANS) equations were are solved by the finite volume method. It was found that the optimum<br/> blade geometry is obtained for the hub-to-tip ratio of 0.7, the aspect ratio of 0.5, the sweep ratio of 0.35, and<br/> the solidity of 0.67. Detailed flow patterns were obtained to discuss the turbine blade optimization.