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유한요소법을 이용한 단순인장 시험편의 탄소성파괴인성치 예측
선동주(D.J.Sun),박명균(M.K.Park),박세만(S.M.Bahk),최영택(Y.T.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
In oder to predict the elastic-plastic fracture toughness for metallic materials, Finite Element Method(FEM) was used for analysis of compact tension specimen. ASTM E399 test procedure was adopted for simulation of FEM. The Load-Crack Mouth Opening Displacement curve obtained from this analysis was used to detect the crack initiation point and determine the elastic-plastic fracture toughness J_IC. In order to prove the results, they were compared with the results from previous experiments and they agree with experimental results.
Brazing 과 Metallizing에 의한 세라믹/금속 접합재 잔류응력의 유한요소 해석
최영택(Y.T.Choi),박명균(M.K.Park),박세만(S.M.Bahk),선동주(D.J.Sun) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
In this study finite element method(FEM) is utilized to determine residual stress distributions induced by heat generated during joining processes of ceramics and metals.<br/> The finite element analysis is focused on the joining area. That comprises the interfacial area between a metal and a insert-layer. The inser-tlayer itself and adjoining area between the insert-layer and a ceramic.<br/> The residual stress distributions on the joining area are analyzed as functions of thicknesses and yield stresses of the insert-layer(Brazing Filler Metal). And for different kinds of metals including SUS304 and SM45C.<br/> Two typical joining processes are considered in this investigation: Active Metal Brazing and Metallizing. Stress distributions on the joining areas are computed for both processes and are compared with one another. This comparison can lead to the better joining method in reducing the residual stresses and consequently provide improved joining technologies.<br/>