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전만수(M. S. Joun),엄재근(J. G. Eom),김민철(M. C. Kim),정완진(W. J. Chung) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
In this paper, a plate forging simulation technique is presented with emphasis on special compound die, which moves with given velocity in the early stage and exerts the prescribed force on the material after its forming load exceeds the given force. Comparisons of predictions between two-dimensional and three-dimensional finite element methods as well as between rigid-plastic and elastoplastic finite element methods are given for a test plate forging process. It is shown that variation of the predictions of plate forging with theory and dimension is relatively great, compared to typical forging, implying that more study on the plate forging is needed.
전만수(M. S. Joun),이장호(J. H. Lee),김민철(M. C. Kim),황지훈(J. H. Hwang),심재원(J. W. Sim),홍석무(S. M. Hong) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
In this paper, a two-dimensional finite element analysis model for rectangular clad plate drawing is proposed to examine its detailed plastic deformation. Three-dimensional behaviors of plastic deformation of clad plate are investigated using some finite element predictions and finite element predictions of its drawing process are qualitatively compared with the experiments. Based on the observations, a two-dimensional analysis model is proposed, which reveals that relatively thin clad material has little influence on history dependent variables including strain and damage. However, residual stress tends to concentrate very much on the clad material.