中文摘要：

针对板壳结构有限元分析的需要,将商用CAD软件生成的板壳结构的三维实体模型用STL文件格式输出.对其进行拓扑关系重构并进行表面网格再划分,在此基础上对单元及面进行分类,从而确定并选取有效三角形面片,并计算面片对应的厚度值及其中面位置.将这些三角形面片移动到中面位置,形成适合有限元分析的板壳中面模型.将这种板壳模型自动转换方案应用到几个实际薄壁构件的实体模型上,成功地抽取了这些板壳的中面模型.结果表明,该方法可大幅度降低生成板壳有限元模型的工作量,提高计算效率.

英文摘要：

In order to meet the need of FEM analysis for plate and shell structure, a 3D solid model is output by STL file. The model＇s topology relationship is reconstructed and its surfaces are retriangulated. On this basis elements and surfaces are classified, and valid triangle facets are chosen, and their thickness and mid-plane position are calculated. These triangle facets are carried to their middle position so that the mid-plane model of a plane and shell structure which is suited for FEM analysis is formed. This method is used to the solid models of some thin-wall structure in practice so that their mid-plane models are extracted successfully, which shows that work and analysis time for FEM models of a plate and shell structure can be reduced greatly.