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中文摘要：
覆盖件冲压仿真计算模型中网格密度分布的合理性与网格单元形态的优劣，对仿真结果的准确性有很大的影响。提出了一种改进的全四边形网格细分方法，使网格的密度分布适于覆盖件冲压分析计算要求，可保证细分后网格的协调性，并将算法推广以处理非结构化四边形网格和三角形四边形混合网格的细分。提出的网格细分策略，有助子提高细分后网格的质量。提出了适用于细分后四边形网格和非结构四边形网格的拓扑形态优化操作，可有效的提高网格模型的形态质量。
英文摘要：
The mesh density distribution and element shape quality have a great impact on the accuracy of sheet metal forming simulation results. A modified quadrilateral mesh refining algorithm was presented, which could adjust the mesh density distribution conveniently, and the algorithm was extended to deal with both unstructured mesh and triangle-quadrilateral hybrid mesh. A mesh refining strategy was proposed which will help improve the refined mesh quality. Some topology cleanup procedures were presented for both structured mesh and unstructured mesh, which could effectively improve the shape quality of the mesh model.
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