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삼차원 형상압출 공정의 유한요소해석과 금형형상 최적설계를 위한 설계민감도 해석
전만수 慶尙大學校生産技術硏究所 1992 生産技術硏究所論文集 Vol.8 No.-
A three-dimensional penalty rigid-viscoplastic finite element method was introduced in this paper. The procedure of deriving the finite element equations and the solution schemes were described in detail. After presenting a mathematical modeling scheme of die geometry in shape extrusion, finite element analysis of a round-to-flower shape extrusion process was carried out and the predicted results were discussed in order to show the numerical characteristics of the penalty finite element method and the importance of the contact condition treatment at the die-workpiece interface in metal forming. Design sensitivity analysis of the load function in round-to-ellipse extrusion was also performed and its numerical characteristics were investigated with emphasis on the accuracy of the design sensitivity. An optimal design minimizing the load function was given for a round-to-ellipse extrusion process.
절점설계법에 의한 단조 공정의 자동유한요소해석 기법의 개념
전만수 慶尙大學校生産技術硏究所 1993 生産技術硏究所論文集 Vol.9 No.-
In this paper, the basic concept of a new finite-element approach to automatic simulation of forging process based on a nodel coordinate design scheme was presented. In the new approach, a whole forging process is automatically simulated by the initial mesh system with node relocation without remeshing and the problems due to remeshing can thus be avoided. The nodal coordinate optimal design scheme, provided the motive of the new concept, was introduced in detail. A typical application example was given, which shows the applicability of the new approach. A rigid-viscoplastic finite-element method was employed for this investigation.
전만수,이민철 慶尙大學校生産技術硏究所 1995 生産技術硏究所論文集 Vol.11 No.-
In this paper, the mesh quality improving schemes were presented such as mesh refinement control scheme, artificial mesh boundary scheme and boundary enveloping scheme. A new approach to nodal coordinate optimal smoothing for dealing with the geometrical problems due to the mesh quality improving schemes was also presented. Several application examples were given, which show the roles of the presented schemes.