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Cu-16 at % Ag 미세복합재료의 미세구조와 전도도
임문수,안장호,홍순익,Im, Mun-Su,An, Jang-Ho,Hong, Sun-Ik 한국재료학회 1999 한국재료학회지 Vol.9 No.6
In this study, the effect of the microstructural evolution on the electrical of Cu-Ag microcomposite was investigated. The nature of interfaces between silver filaments and Cu matrix may have pronounced effects on the physical properties of Cu-Ag filamentary microcomposites, little is known about these interfaces. In heavily drawn Cu-Ag filamentary microcomposities, the microstructure is too fine and the interfacial area is too large to maintsin a stable internal dislocation structure because of closely spaced filaments. Rather, most dislocations are thought to be gradually absorbed at the interfaces as the draw ratio increases. The mechanical and electrical properties of Cu-Ag filamentary microcomposites wires were also examined and correlated with the microstructural change caused by thermomechanical treatments. The study on the electrical conductivity combined to resistivity in Cu-Ag filamentary microcomposites and the rapid increase of the electrical conductivity at high annealing temperatures is mainly caused by the dissolution and coarsening of silver filaments. The relatively low ratio of the resistivities is mainly caused by the dissolution and coarsening of silver filaments. The relatively low ratio of the resistivities at 295K($\rho$\ulcorner/$\rho$\ulcorner) in as-drawn Cu-Ag microcomposites can also be explained by the contribution of the interface scattering.
Craig-Bampton Method 를 이용한 타이어 인터페이싱 개발에 관한 연구
임문수(Mun-su lim),이상선(Sang-sun Lee),김영배(Yeong-bae Kim) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
In order to develop the reduced tire modal model for analyzing a full tire model, the Craig-Bampton<br/> method is utilized in this paper. When the tire contacts the road, the Abaqus solver extracts the condensed<br/> stiffness, coupled mass and mode shape matrix about the node which contacts the road. The Abaqus full<br/> tire model is reduced using the substructure method utilizing Craig-Bampton algorithm. Then, the<br/> extracted matrices are interfaced with the superelement which is fed to the Nastran reduction algorithm.<br/> Eventually, the reduced tire model is verified from experiment and various reduction parameters (i.e.<br/> modal number, reduction point, etc.) are studied for the effectiveness of the proposed research.