体成形数值模拟中的模具型腔、网格生成及接触搜索的一致描述

Compatible Description of Tool Surfaces,FEM Mesh Generation and Contact Search for Simulating Complicated Massive Forming

以三次B样条曲面描述为基础 ,对体成形数值模拟中的复杂模具型腔、锻件三维网格自动划分、锻件与模具接触的状态进行了一体化研究。利用B样条曲面的直观性、局部性、通用性和造型灵活性 ,构造了复杂模具型腔及锻件边界 ,提出了三维网格样条生成法、改进的分块样条生成法及接触判断区域层次搜索技术。

The 3 D tool surface description together with the automatic 3 D meshing methods and the contact search is carried out for the FEM numerical simulation of complicated massive forming based on the cubic B spline.The complex geometry for die cavity and forging surface is described;the spline technique for 3 D mesh generation as well as piecewise mesh generation is proposed and the region section search algorithm is done for the advantages of B spline such as visualization,localization,generalization,flexibility and adaptation for graphic model.