金属塑性成形有限元六面体网格自动划分

六面体网格具有计算精度高、网格数量少等特点 ,是工程三维有限元分析一种重要网格。本文提出了一种基于栅格的六面体网格自动划分方法 ,它首先采用栅格法生成核心网格 ,然后把核心网格与模型边界拟合 ,为克服由于边界拟合造成的表面网格质量下降 ,采用包络表面网格的方法生成零厚度表层网格 ,通过表面网格平滑和内部节点位置平滑处理 ,最终生成具有较高质量的全六面体网格。网格划分实例说明 :该法具有原理简单 ,算法可靠 ,编程方便 ,划分网格质量高等特点。最后还对该算法进行了讨论。

Automatic generation of hexahedral mesh in bulk metal forming

The hexahedral mesh is one of the most important tools in three-dimensional FEA because it can increase the accuracy of the solution and decrease the overall element count. In the present study, a general framework of hexahedral mesh generation of metal forming simulation based on master grid approach is presented, which includes identification of CAD or remeshing model, generation of core mesh, boundary mesh fitting, surface element layer (SEL) generation and mesh smoothing. The results clearly indicated that the algorithms proposed in this study is simple in principal, robustness in programming and can generate high-quality hexahedral mesh. Meanwhile, some important issues about this algorithm are discussed.