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RISS 인기검색어
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- 저자 : 전만수(M. S. Joun) (검색결과 436 건)
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전만수(M. S. Joun),정완진(W. J. Chung),엄재근(J. G. Eom) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
In this paper, a finite element approach to simulating a multi-body metal forming process is presented. The detailed formulation and numerical scheme are introduced. The material-material contact interface is formulated by a penalty method. A complicated fine-blanking process of four layered plates is simulated, which are divided into eight pieces at the final stroke. The binder force and the ejector force are dealt with the reaction-to-die penetration scheme. The simulation is carried out in a fully automatic manner.
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전만수(M. S. Joun) 한국소성가공학회 2016 한국소성가공학회 학술대회 논문집 Vol.2016 No.4
Accuracy of forging simulation is deliberated to give the insight on solution reliability to application engineers or researchers in this presentation. Major factors affecting results of forging simulation are introduced with proper applied examples, involving theory of plasticity, remeshing characteristics, numerical schemes, material properties, frictional conditions, thermal conditions and process conditions such as die motion. Many efforts to enhance solution accuracy and reliability which are being made or will be made in near future are also given together with some typical examples.
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하중 및 변위 동시 구속 목적의 금형을 취급하기 위한 그림자 금형
전만수(M. S. Joun),엄재근(J. G. Eom),정완진(W. J. Chung) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
In this paper, a plate forging simulation technique is presented with emphasis on a 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. The velocity of the shadow die which has direct influence especially on friction is determined by its displacement divided by time increment of the previous solution step. A typical test example of a plate forging process is studied by two- and three-dimensional finite element simulation techniques.
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유한요소법을 이용한 냉간단조에서 발생하는 주요 결함 사례 분석(1)
전만수(M. S. Joun) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
In this paper, major factors affecting solution accuracy of metal forming simulation are discussed and the accuracy of the metal forming simulator AFDEX is validated, which is of great importance for the case studies in the two companion papers on major defects in cold forging using the metal forming simulation technique. The defect formation of the representative defects found from the related literature or industry shopfloors are revealed by the finite element method. The predictions of defect formation are seen through metal flow lines or state variables including effective strain and damage.
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