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Z-map으로 표현된 수직 벽면을 가진 금형에서의 접촉처리법과 클로버형 컵 디프드로잉 공정의 해석에의 응용
서의권,박정환,심현보 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.5
The Z-map model which is quite similar to the non-parametric patch is widely used to describe the shape of a surface because of its simplicity. Despite the inherent advantage of z-map model, it has drawbacks that there exists difficulty in expressing the vertical walls and its related contact treatment method. In the region of vertical walls, there is a convergence problem in searching the contact point. In this study a contact point finding scheme is presented, based on the z value of vertical-wall-included clover shape cup deep drawing process is analyzed and the results are compared with the experimental results. The effects of the Z-map grid distances and the interpolations of the inside Z-map value are also discussed.
Linear Coons Interpolation을 이용한 SEAM 요소의 디프드로잉 탄소성 유한요소 해석
신양호,심현보,임상헌,서의권 嶺南大學校 工業技術硏究所 1996 工業技術硏究所論文集 Vol.24 No.1
In the present study, using the linear Coons interpolation SEAM(Shear Energy Augmented Membrane) elements have been developed. Linear Coons interpolation is used to calculated the transverse shear strain of a base element between the adjacent elements and the base element. Maintaining the numerical efficiency of conventional membrane elements, the effect of out-of-plane deformation(transverse shear deformation at element edge) has been incorporated for the purpose of computational stabilization without introducing additional degrees of freedom. From the circular, square, and rhombic blanks, computations are carried out for the deep drawings of square cup to check the validity and the effectiveness of proposed SEAM elements. For the square and rhombic blank, experiments are carried out and the computational results are compared with the experimental results.
Z-map으로 표현된 금형에서의 접촉처리법과 L형 컵 디프드로잉 공정 해석에의 응용
金正顯,徐義權 慶一大學校 1999 論文集 Vol.16 No.3
, The z-map model which is quite similar to a non-parametric patch is widely used in describing the shapes of surfaces because of its simplicity. Despite its inherent advantage, z-map model has drawbacks such as difficulties in expressing the vertical walls and its related contact treatment method. Especially In the vertical walls, there exists a convergence problem in searching a contact point. In this study a contact point finding scheme based on sheet normal scheme in the z-map model is presented. To show the utility of this scheme, L shape cup deep drawing, which include vertical walls processes are analyzed. The results are compared with the experimental results and the results of commercial FE code PAM-STAMP whose results are widely accepted.