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김명한,권숙인,강춘식,나달주 ( M . H . Kim,S . I . Kwun,C . S . Kang,D . J . Na ) 한국주조공학회 1987 한국주조공학회지 Vol.7 No.3
This paper presents experimental data for the computerization of green sand control. The results can be summarized as follows: 1. To obtain the proper compactability at the mixer, the addtion of moisture is far more efficient than the control of mixing time or addtion of clay. 2. The log R(% clay/% moisture) vs. log compactability curve moves upward as the amount of clay increases and moves downward as the amount of seacoal, dead bentonite or coked seacoal increases. 3. The ratio of dead to initial clay amount or coked to initial seacoal amount is changed according to sand to metal ratio, mainly, and according to pouring temperature, partly, at a shake out time of 12hrs.
순알루미늄 V형 및 Finned Casting 의 응고에 관한 연구
김명한,강춘식,김동옥,정종연 ( M . H . Kim,C . S . Kang,D . O . Kim,J . Y . Jeong ) 한국주조공학회 1987 한국주조공학회지 Vol.7 No.1
The progression of the solidification wave front in V-section and finned casting was studied by use of the pour-out test, employed with high. Purity aluminum. The results obtained were as follows; a) The shape of solidification wave front at the inside and outside corners did not change according to solidification time, but it changes according to the corner angles at a given molding and melting condition. b) The cooling fin effect could be repserented as functions of solidification time and fin size, and this result could be applied to enhance the accuracy of the section modulus method in the design of T and V section.
김명한(M.H.Kim),임석현(S.H.Lim),서명원(M.W.Suh),배동호(D.H.Bae) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
Automobile body structure is generally assembled using various spot welded box sectional members. Especially, in the case of bus, the shape of window pillar joint is assembled in T-type. The T-type member need to solve the problems such as high stress concentration, low fatigue strength and structural rigidity.<br/> In this study, a study on the optimum design of bus window pillar joint for improving such problems by FEM analysis and experiments is performed.
김명한(M.H.Kim),김대성(D.S.Kim),서명원(M.W.Suh),배동호(D.H.Bae) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
The body structure of a bus is generally assembled by using various spot welded box sectional members. The shape of window pillar joint is ordinarily built up by T-type member. It has been shown that T-type member has problems like high stress concentrations, low fatigue strength and low structural rigidity. In this study, to solve these problems a new approach to optimize the design of the bus window pillar joint was tried by FEM analysis and experiments. To describe the shape of the gusset connecting the vertical and horizontal members of the T-type window pillar joint B-spline curve was adopted and this curve was optimized. It was found that the new model developed could effectively improve fatigue durability and structural rigidity.<br/>
과공정 Al-Si 합금의 미세조직에 미치는 Sc의 영향
정유성,김명한,최석환,Jeong Y. S.,Kim M. H.,Choi S. H. 한국재료학회 2005 한국재료학회지 Vol.15 No.7
Sc has been known to be an very effective ppt-hardening element in Al and Al alloys and also to be effective in modification of eutectic Si in hypoeutectic Al-Si alloys. The modification mechanism of Sc is different from that of the traditional modifier Sr in Al-Si alloys. In the present study the effects of Sc on the primary and eutectic Si in hypereutectic Al-Si alloys were investigated with evaluating the microstructures with OM, EPMA and EBSD methods. The results represent that Sc has only a small effect on primary Si when added less than $0.8wt\%$. However, when Sc addition leading to the precipitation of metallic Sc within primary Si reaches $1.6wt\%$, very coarse primary Si occurs.
[구조강도부문] Spot용접된 T형 상자형단면재의 응력해석
김대성(D.S.Kim),김명한(M.H.Kim),배동호(D.H.Bae) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The body structure of a bus is generally assembled by using various spot welded box sectional members. The shape of window pillar joint is ordinarily built up by T-type member. It has been known that T-type member has problems such as high stress concentrations, low strength and low structural rigidity. Because there problems affect the performance and the durability of bus body, there is needed to improve of them, In order to improve of them, stress distribution on the T-type member must be previously understood. In this is study, several approaches to analyze stress distribution of bus window pillar joint were tired by FEM analysis, theoretical analysis and experiments. Particularly, stress distribution of the bus window pillar member could be theoretically analysed by the theory of shear flow. And, it is expected that its results can be applied to optimum design of the T-type bus window pillar member.