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RISS 인기검색어
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- 저자 : 이승열(S. Y. Lee) (검색결과 98 건)
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이승열(S. Y. Lee),강경필(K. P. Kang),이경훈(K. Lee),김정석(J. S. Kim),이우근(W. G. Lee),선승주(S. J. Sun),임재용(J. Y. Lim) 한국소성가공학회 2016 한국소성가공학회 학술대회 논문집 Vol.2016 No.4
Friction stir welding(FSW) process of magnesium alloy was simulated using the finite element method. Fully coupled thermo-mechanical model was adopted in this simulation. Comparison of the flow pattern and temperature distribution for the various rotational and translation speed is presented in this work.
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이승열(S. Y. Lee),이경훈(K. Lee),임용희(Y. H. Lim),정우창(W. C. Jeong) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
The heat transfer characteristics between die and sheet and between die and coolant are major processing parameters in hot press forming process. The determination of quenching time to guarantee full martensitic transformation requires proper understanding of these heat transfer characteristics. The contact area changes drastically during the quenching process due to the volume change of both die and sheet by temperature drop and also phase transformation. Several different type of modeling method is tested and proposed proper method. The effect of martensitic transformation with respect to the quenching time is investigated and compared to the experiment. The influence of heat conductivity of die material is also considered.
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이승열(S. Y. Lee),정지용(J. Y. Jeong),박성호(S. H. Park),김상헌(S. Kim),금영탁(Y. T. Keum) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
In this study, in order to get the forming limit of AHSS sheet in the negative minor strain region, the shapes of die corner and drawbead are redesigned by employing the Taguchi’s design of experiment method and the FEM forming simulation. With the redesigned FLD tool, the forming limit test of automotive multi-phase(Dual Phase and Complex Phase) steel sheets which induce the normal fractures on the blank are performed.
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