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강경필(Gyeongpil Kang),이경훈(Kyunghoon Lee),김용환(Yonghwan Kim),신광선(Kwangseon Shin) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
The asymmetric material behavior during tension/compression of magnesium alloy make it unsuitable for the typical continuum based FE analysis to be used in the simulation of magnesium alloy forming process. In this research, we designed a methodology to use crystal plasticity model as a constitutive equation. To predict the behavior of magnesium, alloy in multi-scale level, we implemented VPSC model into rigid plastic FE code which is suitable for the simulation of large deformation process such as rolling, forging and extrusion. Application results are shown for the extrusion and rolling process of pure magnesium.
강경필(Gyeongpil Kang),이승열(Seungyeol Lee),김용환(Yonghwan Kim),홍성석(Sungsuk Hong),이성호(Sungho Lee) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
The control of the movement of rolls is key technology in ring rolling process. The design parameter can be more accurately tested with the help of 3D FE simulation. The processing map can tell us important information for the design of hot working condition. In this paper, the workability of 7050 aluminum alloy during ring rolling process is evaluated by combining the FE simulation result with processing map. The evaluation was carried out and presented here for the real manufacturing process and theoretically well designed condition, that is, constant growth velocity condition of outer ring.
멀티 스케일 모델을 적용한 선재 공정의 미세결함 형상 변화 예측
곽은정(Eunjeong Kwak),강경필(Gyeongpil Kang),이경훈(Kyunghoon Lee),손일헌(Il-Heon Son) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
Multiple scale modeling has been applied to predict defect shape change during the wire rod rolling process. The size difference between bloom and defect prevent using usual FEM approaches due to the enormous number of elements required to depict the defect. The newly developed multiple scale model can visualize defect shape changes during the multi stands rolling process. The defect positioned at the top and side of bloom are smoothed out but the one at the middle evolved as folding or remained as crack. This approach can be used for defect control with roll shape design and initial bloom shape.
멀티스케일 기법에 의한 대형 잉곳 자유단조시의 기공 결함 거동 예측
관은정(Eunjeong Kwak),강경필(Gyeongpil Kang),이경훈(Kyunghoon Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
Open die forging consists of upsetting and several cogging processes during which internal voids and segregations are removed. Inner voids which are generated during the casting process can be one of the cause of critical defects in final product. So it is important to establish the standard of judgment for void closure in upsetting. The size difference between the large ingot and the real-scale void requires hundreds of elements for FE simulation to depict the defect formation that it is impractical in calculation time with this approach. The newly developed multiple scale method is adopted for FE simulation, which is reasonable in calculation time and can visualize void evolution during upsetting process.