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3차원 곡면 내삽법을 이용한 자동차 박판 부품의 변형률 측정법 개선
김종봉(J.B.KIM),양동열(D.Y.YANG) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
The measurement of strains in stamped sheet metal is essential to design and producing sound sheet metal products. The measured strains, also, can be used in verifying the reliability of computer analysis such as finite element method. Measuring strains is difficult and need much time. In most engineering applications, strains are measured from the square or circular grid that are marked before deformation. In this case, however, strains are averaged in each grid and the localized strain, occurred in smaller region than grid size, can not be measured. In this study, the B-spline surface interpolation technique introduced in order to measure the strains more exactly and conveniently. The strains measured by using she surface interpolation technique are compared with the strains calculated from the grid shape and by the finite element analysis.<br/>
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/>
[생산기술부문] 박판성형공정의 유한요소 해석에서 비드저항력 적용
김종봉(J.B.KIM),양동열(D.Y.YANG),유동진(D.J.YOO) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Drawbeads arc widely used in the stamping processes in order to control the material flow. The defects of sheet metal products such as wrinkling and tearing can be controlled by appropriate implementation of drawbeads, The equivalent drawbead restraining force is imposed in finite clement analysis of sheet metal forming process in the form of nodal external force vector. Nodal drawbead forces arc calculated by newly proposed method, In order to avoid the abrupt change of external nodal drawbead forces the nodal drawbead forces are calculated by the surface integration of the bead force density in the bead area, The results are compared with the results obtained by ordinary line integration