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이장호(J.H.Lee),변철호(C.H.Byun),김무환(M.H.Kim) 대한설비공학회 1995 대한설비공학회 학술발표대회논문집 Vol.1995 No.6
공조기에 있어서 중요한 구성요소 중의 하나인 증발기의 냉매경로를 직접 따라 가면서 관을 세분한 국소 영역의 열전달을 해석하고 이를 합산하는 방법으로 해석 알고리즘을 구성하고 이를 실험적인 방법으로 검증한 결과 약 ±6.6%의 오차를 가지는 것을 확인하였다.
4각 딥드로잉 클래드판재 성형공정의 탄소성 유한요소해석
이민철(M. C. Lee),홍석무(S. M. Hong),황지훈(J. H. Hwang),심재원(J. W. Sim),이장호(J. H. Lee),정완진(W. J. Chung),전만수(M. S. Joun) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
In this paper, three-dimensional elastoplastic finite element approach to simulating a clad-metal sheet metal forming process is presented. The approach is based on a layered finite element mesh system with tetrahedral elements and a force imposing die to deal with blanking holder force. The predictions are compared with experiments, revealing that they are in a good agreement with each other.
정석환(S. H. Chung),이민철(M. C. Lee),이장호(J. H. Lee),전만수(M. S. Joun) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.10
In this paper, an approach of applying the steady state analysis technique for extrusion process is presented. With complicated shape extrusion process such as a pot-hole extrusion, the finite element analysis needs numerous remeshings, where it is not possible to simulate the process to the end for the severe case. Therefore, a steady state approach normally developed for rolling process is necessary not only for saving computation time but also for overcoming remeshing problem. Since the shape of extruded product is much more complicated than of rolled product in general, tetrahedral mesh systems instead of hexahedron mesh systems were used for the finite element analysis and the streamline tracing scheme was combined with remeshing scheme during iterations for finding steady state. The result of steady state analysis for the simply shaped extrusion process with cylindrical and square crow section was compared with that of traditional non-steady state simulation.
금형의 탄성변형을 고려한 포트홀 압출공정의 유한요소해석
정석환(S. H. Chug),이장호(J. H. Lee),이민철(M. C. Lee),전만수(M. S. Joun) 한국소성가공학회 2016 한국소성가공학회 학술대회 논문집 Vol.2016 No.4
In this paper, non-steady state finite element simulation of a porthole extrusion process for manufacturing a radiation pipe under isothermal assumption is conducted with emphasis on effect of elastic deformation of dies. Effect of die elastic deformation on forming load and deformed shape of material is investigated, revealing that consideration of die elastic deformation is inevitable for precision or optimized die orifice design in extrusion of aluminum bars with complicated cross-sections. It is shown that extrusion simulation considering die elastic deformation is numerically stable, compared with forging simulation. It is, of course, due to steady-state behavior of forming load in extrusion.
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.
엄재근(J. G. Eom),이민철(M. C. Lee),이장호(J. H. Lee),최영길(Y. G. Choi),김동환(D. H. Kim),전만수(M. S. Joun) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
In this paper, finite element prediction of die wear is conducted using non-isothermal finite element analysis of an actual hot forging process for a commercialized crankshaft. The Archard wear model with a law of hybrid friction is utilized. The non-isothermal finite element method is employed and the predictions are also compared with isothermal finite element predictions with emphasis on the metal flow lines.