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김종봉(J.B.KIM),이동우(J.W.YOON),윤정환(D.W.LEE),양동열(D.Y.YANG) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
2D finite element analysis for the drawbead forming and drawing was carried out. The present study is concerned with the element behavior in bending dominant deformation. In order to investigate the behavior of a 4-node bilinear element and a 9-node quadrilateral element in the tensile mode and in the bending mode, the simple tensile deformation and the transverse shear deformation were analysed. Also, the drawbead forming and drawing was analysed using the two types of elements. The comparison of the computations with the experiments sbows that the 9-node element is more effective than the 4-node element in bending dominant processes.<br/>
비드가 있는 직사각컵 딥드로잉 공정의 3차원 유한 요소 해석의 비교 연구
양동열(D.Y.Yang),이상욱(S.W.Lee),윤정환(J.W.Yoon),이동우(D.W.Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
In this work, three kinds of analysis methods; i.e., elastoplastic shell/implicit method, elastoplastic shell/explicit method and rigid-plastic continuum/implicit method, are compared and discussed for analyzing a rectangular 'cup deep drawing with beads under the same computational circumstances. They are also compared with the experimental results to clarify the differences of formulation. From the comparisons, their merits and demerits have been discussed.
윤정환,유동진,송인섭,양동열,이장희,Yoon, J.W.,Yoo, D.J.,Song, I.S.,Yang, D.Y.,Lee, J.H. 한국정밀공학회 1994 한국정밀공학회지 Vol. No.
An equilibrium approach is suggested as an effective tool for the analysis of sheet metal forming processes on the basis of force balance together with geometric relations and plasticity theroy. In computing a force balance equation, it is required to define a geometric curve approximating the shape of the sheet metal at any step of deformation from the geometric interaction between the die and the deforming sheet. Then the geometic informations for contacting and non-contacting sections of the sheet metal such as the number and length of both non-contact region, contact angle, and die radius of contact section are known from the geometric forming curve and utilized for optimization by force balance equation. In computation, the sheet material is assumed to be of normal amisotropy and rigid-phastic workhardening. It has been shown that there are good agreements between the equilibrium approach and FEM computation for the benchmark test example and auto-body panels whose sections can be assumed in plane-strain state. The proposed equilibrium approach can thus be used as a robust computational method in estimating the forming defects and forming severity rather quickly in the die design stage.