Papers by Author: Oleg Rozenberg

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Authors: Choun Sung Kang, S.C. Lee, K.T. Kim, Oleg Rozenberg
Abstract: Densification behavior of iron powder under cold stepped compaction was studied. Experimental data were also obtained for iron powder under cold stepped compaction. The elastoplastic constitutive equation based on the yield function of Shima and Oyane was implemented into a finite element program (ABAQUS) to simulate compaction responses of iron powder during cold stepped compaction. Finite element results were compared with experimental data for densification, deformed geometry and density distribution. The agreement between finite element results and experimental data was very good for iron powder. The distributions of hydrostatic pressure and the Mises stress of iron powder under cold stepped compaction were also studied.
Authors: Tatiana Prikhna, Wolfgang Gawalek, Yaroslav Savchuk, Nina Sergienko, Viktor Moshchil, Sergey N. Dub, Vladimir Sverdun, Leo Kovalev, Vladimir Penkin, Oleg Rozenberg, Matthias Zeisberger, Michael Wendt, Gunter Fuchs, Chris Grovenor, Sarah Haigh, Vladimir S. Melnikov, Peter Nagorny
Abstract: Addition of Ti and Zr to high-pressure (HP) synthesized MgB2 results in an increase of critical current density of the material due to the absorption of impurity hydrogen coming most likely from the materials of a high-pressure cell. The results of the studies of structure, critical current density, trapped field and mechanical characteristics are discussed. High-pressure synthesized MgB2 (with Ti additions) blocks were for the first time used in a SC electromotor at 20 K and demonstrated the efficiency similar to that of MT-YBCO bulk (at the same working temperature).
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