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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.
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.
잔류응력 예측을 위한 Tubular Shaft의 고주파 열처리 공정 해석 연구
이승열(S. Y. Lee),강경필(K. P. Kang),이경훈(K. H. Lee),오병기(B. K. Oh),유창범(C. B. Yu) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.10
In the scanning induction hardening process, the workpiece is first heated by eddy current and then water-jet quenched. In order to provide insightful understanding on the micro structural and dimensional changes of the workpiece during the process, the electromagnetic field, heat transfer and material response to the continuous changing thermal boundary condition should be considered simultaneously. In this paper, a tubular shaft undergoing the scanning induction heating compared with the available experimental data.