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김민철(M. C. Kim),정완진(W. J. Chung),김종호(J. H. Kim),전만수(M. S. Joun) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
In this paper, a finite element approach to analyzing a deep piercing process is presented. In the approach, the element deletion scheme after the element degradation scheme is employed to predict the piercing phenomenon because the time interval between the piercing initiation time and the final stroke is quite large. The normalized Cockcroft-Latham damage model is used and an assumed flow stress smoothing function is used to reflect the effect of cumulative damage on the flow stress. The approach is applied to a deep piercing process and the predictions are compared with experiments in terms of plastic deformation of the whole process. The comparison shows a good agreement with each other.
고온 및 상온에서의 소재 유동응력 획득 프로그램 AFDEX /MAT
김민철(M. C. Kim),전만수(M. S. Joun) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
In this study, AFDEX /MAT, an acquisition program of flow stress of material at the room or elevated temperature is presented. The flow stress at the room temperature is calculated from a simple tensile test of cylindrical specimen using an iterative algorithm of obtaining flow stress at the large strain which meets well with the experimental tensile test. The flow stress at the elevated temperature is obtained from hot compression tests at the sampled temperatures and strain rates using the least square approximation to minimize the difference between the experiments and fitted mathematical models. The improved user interface is introduced and application examples are given, which shows the applicability of the program for learned users.
전기자동차용 알루미늄 밧데리케이스 충격후방압출공정 해석을 위한 마찰에 관한 고찰
김민철(M. C. Kim),이민철(M. C. Lee),이민철(M. C. Lee),전만수(M. S. Joun) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
In this paper, appropriate frictional law and conditions for predicting the cold impact backward extrusion process of an aluminum battery case of electric vehicles are presented. Some limitations in simulating the battery case backward extrusion process using finite element method are explained with emphasis on mesh effects and frictional phenomena. A hybrid frictional law is proposed to simulate battery case backward extrusion, based on the investigation into the frictional flow marks on the internal bottom.