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RISS 인기검색어
- 검색키워드
- 저자 : 김옥삼 ( Soo Hong Min (검색결과 4 건)
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FEM 을 이용한 주조금형의 (鑄造金型) 탄소성 (彈塑性) 열응력 (熱應力) 및 열변형 해석
김옥삼,구본권,민수홍 ( Ok Sam Kim,Bon Kwon Koo,Soo Hong Min ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.1
N/A It is well-known that the analysis of elasto-plastic thermal stress and deformation are substantially important in optimal design of metal casting mould. The unsteady state thermal stress and deformation generated during the solidification process of ingot and mould have been analyzed by two dimensional thermal elasto-plastic theories. Distributions of temperature, stress and relative displacement of the mould are calculated by the finite element method and compared with experimental results. In the elasto-plastic thermal stress analysis, compressive stress occurred at the inside wall of the mould whereas tensile stress occurred at outside wall. A coincidence between the analytical and experimental results is found to be fairly good, showing that the proposed analytical method is reliable.
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Quenching시 나트륨계 수용액의 냉각성능에 관한 연구
김옥삼,최은순,민수홍 ( Ok Sam Kim,Eun Soon Choi,Soo Hong Min ) 한국열처리공학회 1992 熱處理工學會誌 Vol.5 No.4
Coolingability of coolants is important factor in cooling processor heat treatment of steel, Using standard apparatus and method defined in the Korean Industrial Standard three different shapes of probe were designed, ie, cylinderical, spherical and square on shape with same volume of standard probe. Distilled water and sodium aquious solutions with different concentration of NaOH, NaCl and Na₂CO₃were examined. Estimation of coolingability of each quenchants for the probes of cylinderical, spherical or square shape, the cooling rate is greater square, cylinder and sphere in order. Coolingability of sodium aquious solution of NaCl, Na₂CO₃and NaOH is found generally greater then that of distilled water. Effectiveness of ingredients is in the order of Na₂CO₃, NaOH and NaCl. In both solutions coolingability increases in 20%, 5%, and 10% in order. Analytical results obtained from Finite Element Method were compared with experimental ones and found as practically satisfactional.
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민수홍,김옥삼,구본권 ( Soo Hong Min,Ok Sam Kim,Bon Kwan Koo ) 한국주조공학회 1991 한국주조공학회지 Vol.11 No.1
N/A The process of solidification of metal is accompanied by liquid-solid change and known as Stefan`s heat conduction problem on the moving boundary. In this study the temperature distribution in ingot and metallic mould during casting was analyzed by the two dimensional heat conduction theory. The transient temperature distribution was numerically calculated using a finite element method on the nodal point of mesh screen representing ingot and mould cross section. The theory was applied on the casting of aluminum(purity ; 99%) in flat ingot mould of GC25. The analysis will make it possible to calculate an optimum mould shape of which temperature gradient becomes minimum.
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민수홍,구본권,김옥삼 ( Soo Hong Min,Bon Kwon Koo,Ok Sam Kim ) 한국주조공학회 1991 한국주조공학회지 Vol.11 No.3
N/A It is known that the analysis of thermal stresses is substantially important in optimal design of casting mould. In this paper unsteady state thermal stresses generated in ingot and mould during the solidification process are analyzed by the two dimensional thermal elasto-plastic analysis. Distribution of temperature and stress of the mould is calculated using the finite element method and compared with experimental result. The significant results obtained in this study are as follows. At the early stage of the casting process, abrupt temperature change was shown in the vicinity of the inner surface of the mould. The largest temperature gradient is occurred at the corner of the mould. In the thermal stress analysis, compressible stress occurred in the inside wall of the mould where as tensile stress on outside wall. Smaller thermal stress is observed at the rounded corner. It is also observed that the shown is influenced by the thickness of the wall. A fairly good coincidence is found between analytical and experimental results, showing that the proposed analytical methodology is reliable.
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