文档介绍：南京航空航天大学硕士学位论文 i 摘要随着钣金零件结构的日益复杂,实际生产中经常要涉及复杂不可展曲面的展开计算。而传统几何钣金展开方法基于投影映射原理,缺乏对塑性成形过程中力学因素的考虑,因此只能用于简单可展钣金零件的展开计算,误差比较大,难以应对高质量钣金展开的需要。针对上述问题,将有限元数值模拟技术引入钣金展开计算,提出一种基于全量法的有限元逆算法钣金展开解决方案,保证对复杂不可展曲面展开的结果精度。本文基于有限元逆算法基本原理编制钣金不可展曲面展开算法程序。综合运用微软 XNA 技术和高阶着色语言 HLSL 实现了有限元数值模拟分析结果的三维可视化,并生成对应展开动画。通过 Automation 及 CAA 二次开发技术,将各个程序模块集成到 CATIA 环境下,实现了从建模、展开求解、可视化分析到后续处理的一体化流程,大大提高了设计效率。最后将典型不可展钣金零件 L 形盒和汽车钣金零件作为实例,通过将模拟分析结果与基于增量法的 DYNAFORM 软件分析结果进行比较,验证了有限元逆算法的有效性和通用性。关键词: 钣金展开,有限元,不可展曲面,初始场不可展钣金展开的研究及软件开发 ii Abstract Blank design has very great influence over the the final quality of sheet metal forming process, for its upstream position in the process pipeline. Traditional blank design method monly based on projection mapping principle which takes no account of mechnic in the process. Therefore only simple sheet metal parts can be designed by that way. In view of the above problem, finite element inverse approach is introduced into blank design. Based on total strain theory, this approach significantly upgrade the precision of calculation. The prehensivly indroduced the algorithm of finite element inverse approach. For the application in practice, puter program was developed based on the theory, and low efforts were made for the convenience of employing. One is the program of calcuation was intergrated in CATIA, the well-known CAD application which widly used in aircraft industry, achived by using CAA, the redevolopment framework for CATIA, programed in C++ language. Using 3D graphic to represent data generate by calculation is another effort which visualized all abstract data such as thickness spread. This is mainly programed in C# language. based on XNA framework. HLSL language was used to directly program the graphic adapter hardware to made outstanding visual effect and high framerate. Keywords : sheet meta outspread, finite element, skew ruled surface , initial guess 南京航空航天大学硕士学位论文 v 图表清单图 有限元逆算法示意图...............................................