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김민철(M. C. Kim),이성원(S. W. Lee),전만수(M. S. Joun) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
In this paper, a ductile fracture approach to predicting the piercing stage of the automatic multi-stage cold forging processes are studied with emphasis on fracture prediction and automatic simulation of consecutive stages of multi-stage forging processes. The normalized Cockcroft-Latham damage model is employed to predict the fracture and a smoothing scheme to clear the fracture surface is proposed for easy simulation of the consecutive stages. The approach is applied to five-stage cold forging processes and the predictions are compared with the predictions of a simple approach as well as the experiments.
역전파 신경회로망을 이용한 피로손상 모델링에 관한 연구
김민철(M.C.Kim),주원식(W.S.Joo),장득열(D.Y.Jang),조석수(S.S.Cho),김순호(S.H.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
Back-propagation neural networks performs computer simulations that have the potential to find the same patterns that fatigue practitioners recognize to relate experimental results to fatigue life prediction. This potential was used to construct neural networks to recognize the relation between da/dN, N/Nf, X-ray diffraction half-value breadth ratio B/Bo, fractal dimension D_f and fracture mechanical parameters for Al 2024-T3 alloy. Learning and generalization of neural networks was optimized by floating rate method. This study shows that neural networks has ability to predict fatigue crack growth rate and life on data of unlearned experimental condition.<br/>
김민철(M. C. Kim),엄재근(J. GL Eom),임성주(S. J. Lim),최호준(H. J. Choi),전만수(M. S. Joun) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
In this paper, a new approach to finite element analysis of a swaging process is presented. An analysis model is presented with emphasis on the pusher that imposes the back pressure to keep the workpiece from slipping along the die-workpiece interface especially when the inclined dies are utilized. The rigid-plastic finite element method is employed. The approach is applied to simulate a tube swaging process and its results are compared with the predictions, revealing that they are in close agreement with each other.
가상상태변수체적력법에 의한 후방인장력이 부가된 다단인발공정에서 유한요소해석
김민철(M. C. Kim),엄재근(J. G. Eom),안순태(S. T. Ahn),전만수(M. S. Joun) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
In this paper, a virtual state-variable body-force method is presented to simulate multi-pass drawing under back tension by finite element method with higher accuracy. A numerical scheme for reducing artificial deformation or bulging of elastic region in rigid-plasticity is also employed to raise the solution accuracy. The approach is applied to a six-pass drawing process with different back tensions, showing that the presented approach guarantees the accuracy as well as generality or applicability.