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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.
Al6061의 고온변형특성 및 단조 시뮬레이션 적용을 통한 검증
엄재근(J. G. Eom),장성민(S. M. Jang),이민철(M. C. Lee),정순종(S. J. Jung),박건형,곽양섭,전만수(M. S. Joun) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
In this paper, flow stress of Al6061 is obtained by compression test in the range of temperature from 300℃ to 550℃ and effective strain-rate from 0.1/s to 20.0/s. The flow stress information is used to simulate an aluminum hot forging process. Non-isothermal simulation is carried out by a rigid-thermoviscoplastic finite element method. The predictions are compared with the experiments terms of the deformed shape of material.
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.
유한체적법에 근거한 단조공정 시뮬레이터를 이용한 난형상 열간단조 공정의 컴퓨터 시뮬레이션
엄재근(Eom J. G),최인수(Choi I. S),김홍태(Kim H. T),이민철(Lee M. C),박성용(Park S. Y),전만수(Joun M. S) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The finite volume method for forging simulation is examined to reveal its possibility as well as its problem in this paper. For this study, the finite volume method based MSC/SuperForge and the finite element method based AFDEX are employed. The simulated results of the homogeneous compression obtained by the two softwares are compared to indicate the problems of the finite volume method while several application examples are given to show the possibility of the finite volume method for simulation of complex hot forging processes. It is shown that the finite volume method can not predict the exact solution of the homogeneous compression especially in terms of forming load and deformed shape but that it is helpful to simulate very complex forging processes which can hardly be simulated by the conventional finite element method.
엄재근(J. G. Eom),김민철(M. C. Kim),손일헌(I. H. Son),전만수(M. S. Joun) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
In this paper, three-dimensional finite element approach of simulating the closing phenomena of tiny pore defect inside the initial bloom, which were supposed to be formed during continuous casting process of the base material. The initial spherical shape of cavity is traced. Because of smallness of the cavity compared to the size of bloom, a special local meshing or remeshing capability is applied. It has been found that the pore closing speed is quite slow and the effective strain at the pore closing is relatively high, which is supposedly due to relative low hydrostatic pressure in rolling.