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[論文] ION 窒化에 있어 添加 炭素量이 殘留應力에 미치는 영향
김희송(H.S.Kim),강명순(M.S.Kang) 한국자동차공학회 1982 오토저널 Vol.4 No.2
This paper deals with residual stress characteristics of ion-nitrided metal which is primarilly concerned with the effects of added carbon content in gas atmosphere.<br/> A small optimal amount of carbon content in gas atmosphere increase compound layer thickness, as well as to increase diffusion layer thickness and hardness.<br/> The residual stress and deflection of the specimens was measured in various elevated temperature at the surface of ion-nitrided metal and the internal stress distribution was cal-culated.<br/> It is found that compressive residual stress at the compound layer is largest at the compound layer, and decreases as the depth from the surface increases.
김기성(K. S. Kim),김희송(H. S. Kim),정남용(N. Y. Chung) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
Recently, the cases of using bonded dissimiliar materials whose components are different each other, tend to increase for the purpose of using to developement of new materials and special objects in the field of industry in these days. Among the cases the strength evaluation of the joining materials of vehicle engine and structural materials of heat engine are bonded joint ceramics/metal.<br/> In this paper, strength evaluation method of ceramic/metals considering stress singularity were analyzed using boundary element method and 4-point bending test So the advanced method of quantitative strength evaluation for ceramic/metals bonded joints are to be suggested.<br/>
김기성(K. S. Kim),김희송(H. S. Kim),정남용(N. Y. Chung) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
In this paper, a method to analyze an interface crack under both residual stresses and applied loading was proposed, and some results of boundary element method(BEM) analysis were presented. The bonding strengths of Si₃N₄/metal joints with an interface crack were examined, and the stress intensity factors of these joints were analyzed by BEM. Also crack propagation direction was numerically simulated by using BEM. Crack propagation angle was able to easily determine based on the maximum stress concept Moreover, a simulation analysis of the fracture angle was presented and the results were compared with those of the experiments. The predidtion of fracture strength by the fracture toughness of the Si₃N₄/metal bonded joints were proposed.<br/>