저자명 윤종헌 
년도 2003 
As the numerical analysis technique and computing system for sheet metal forming process develops, reliability of the analysis is on the increase and the forming analysis of complicated geometry model or multi-stage forming analysis also can be carried out with various commercial codes such as LS-DYNA3D or ABAQUS. For the case of complicated geometry model, however, severe local deformation could occur which induces increase the computing time and deteriorating the convergency of analysis. For the case of multi-stage forming analysis, distortion and severe deformation of the mesh geometry have an effect on the quality of forming analysis results when mesh geometry formed by forming analysis of first stage is applied to forming analysis of next stage. In order to increase the quality of analysis results, an expert has reconstructed in good shaped mesh geometry on its final model when expert has information of the final shape of forming model. And then mapping of all the state variables obtained by forming analysis of first stage to the reconstructed mesh geometry, and applies this model to next stage of forming analysis. Adaptive meshing technique is also used to reduce distortion of element during the simulation. But, computation time is tremendously increased with adaptive meshing technique and it also puts a restriction among subdivided elements.
In this paper, for the enhancement of efficiency of sheet metal forming analysis, a regularization method is newly proposed. In the regularization method, distorted elements are found by searching criterion and these elements compose patches to be modified. Then, the each patch is extended to three-dimensional surface in order to obtain three-dimensional surface information. For the surface enclosing the each patch, NURBS(Non-Uniform rational B Spline) surface is employed to describe three-dimensional free surface. On the basis of constructed surface, each node is properly arranged to make out unit elements. Then, the calculated state variables on its original mesh geometry are mapped into the new mesh geometry to apply for forming analysis of next stage. The analysis results with proposed is compared to the results of the direct forming analysis to check out the validity of this method.

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