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엄재근(J. G. Eom),정재헌(J. H. Jung),이상욱(S. W. Lee),전만수(M. S. Jeon) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
In this paper, a two-stage plate forging process is simulated considering air trapping between workpiece and dies. A basic approach is introduced to deal with the air trapping. The volumetric strain of each cavity enclosed by the workpiece, a die and/or a plane of symmetry is traced and the pressure, a function of the volumetric strain and maximum normal stresses of the neighboring contact regions, is exerted in the surface of workpiece inside the cavity. Predictions are compared with experiments, showing that they are in good agreement with each other.
유한요소법을 이용한 고압유압펌프용 오목형 피스톤 조립체의 소켓 형상 설계
엄재근(J. G. Eom),이민철(M. C. Lee),최인수(I. S. Choi),전만수(M. S. Joun),조유종(Y. J. Cho) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
A finite-element based approach to socket shape design of a concave piston assembly for a high pressure hydraulic pump of an excavator is presented in this paper. The approach is applied to developing a concave piston assembly which fulfills its strength requirement and it is verified that the predictions are in good agreement with the experiments.
엄재근(J. G. Eom),이추실(Q. S. Li),장성민(S. M. Jang),안순태(S. T. Ahn),손요헌(Y. H. Son),현성운(S. W. Hyun),김혁(H. Kim),윤덕재(D. J. Yoon),전만수(M. S. Joun) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
In this paper, plastic deformation behaviors of ESW105 and SCM435 steels are revealed by simulations and experiments. ESW105 is the special pre-heat-treated steel characterized by high initial yield strength and negligible strain-hardening behavior. The flow stresses of the two steels for large stain are calculated from tensile tests. Axial and lateral compressions of cylindrical bars are tested and simulated and the deformed shapes are compared to characterize the plastic deformation behaviors of the two materials. A forward extrusion process of a cylindrical bar is also simulated to reveal the difference. It has been shown that there are pretty much difference in plastic flow between ESW105 and SCM435 which causes from the difference in strain-hardening capability, implying that the experience-oriented design rules for common commercial materials may lead to failure in process design when the new material of ESW105 is applied without consideration of its plastic deformation behavior.
손상도 모델에 따른 인장시험 중 파단 예측 결과의 변화
엄재근(J. G. Eom),심규하(G. H. Sim),김민철(M. C. Kim),전만수(M. S. Joun) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
In this paper, finite element predictions of tensile test of a cylindrical specimen are conducted for different damage models. An optimized analysis model to predict tensile test with emphasis on fracture is introduced. McClintock damage model, Rice-Tracey damage model, Cockroft-Latham damage model, Freudenthal damage model, Brozzo et al. damage model and Oyane et al. damage model are used and the predictions are compared to evaluate the damage model from the viewpoint of tensile test.