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1. Title : Scale bridging of nano and micro mechanics for solid surface suspension technology

SEMINAR. 1. Title : Scale bridging of nano and micro mechanics for solid surface suspension technology 2. S peaker : Prof. Kyung-Suk Kim (Brown University, U.S.A.) 3. T ime : 1 0 : 3 0 – 12:00, Friday, December 21, 2007

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1. Title : Scale bridging of nano and micro mechanics for solid surface suspension technology

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  1. SEMINAR 1. Title :Scale bridging of nano and micro mechanics for solid surface suspension technology 2. Speaker : Prof. Kyung-Suk Kim (Brown University, U.S.A.) 3. Time : 10:30 – 12:00, Friday, December 21, 2007 4. Place : e+ Lecture Hall (room 83188), 2nd Research Building, Sungkyunkwan University 5. Summary : The mechanics framework of the solid surface suspension technology is established by scale bridging of the nanometer scale strength and the micro mechanisms of friction and wear. The scale bridging is based on the “Field Projection Methods” for nano-scale progressive deformation mechanisms such as dislocation emission, phase transformation, cooperative slip and cleavage mechanisms. Adhesion and dislocation emission processes at a contact edge (or a crack tip), along a gold (111) plane, are simulated with a modified EAM atomistics approach and analyzed with the Field Projection Method based on the Stroh formalism. The lattice trapping effects are evident in both healing (adhesion) and dislocation emission processes. The analyses are extended to multiple asperity contacts, employing the Rice-Thomson dislocation emission model and a finite element discrete dislocation model. The results predict formation of a very thin surface tensile layer which leads to delamination wear. Formation of the tensile layer causing the delamination wear is confirmed with experiments, after which a new technological approach of minimizing wear of ductile FCC metals is introduced; the approach is the nano and micro solid surface suspension with hard particles. Recent applications of the solid surface suspension technology to develop light weight structures in auto industries will be also introduced in this talk. 6 Background : Education 1974 Mechanical Engineering, Seoul National University, B.S. 1976 Mechanical Engineering, Seoul National University, M.S. 1980 Solid Mechanics, Brown University, Ph.D. Work Experience 1979-1980 Research Fellow in Aeronautics Dept. at California Institute of Technology 1980-1989 Professor in Theoretical and Applied Mechanics at University of Illinois Urbana-Champaign 1989- Professor in Engineering Dept. at Brown University 7. Questions :SAINT Administration Office (031-299-4115) Sungkyunkwan University

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