用动态显式有限元法对板材成形进行计算机模拟

介绍了动态显式有限元法的原理和特点 ,总结讨论了国际现有各种商用有限元软件的情况。采用显式有限元软件 L S- DYNA3D对板材零件冲压过程进行计算机模拟分析 ,预测冲压过程中可能出现的各种工艺缺陷 ,例如坯料的起皱、局部减薄和破裂 ,并以模拟结果为依据提出改进模具和工艺参数的办法 ,优化工艺参数 ,可以减少调试和修模的次数 ,以此实现降低模具费用、缩短制模时间、提高产品成品率和材料利用率 ,最终达到减少产品成本的目的。

COMPUTER SIMULATION OF SHEET METAL FORMING USING THE DYNAMIC EXPLICIT FINITE ELEMENT METHODS

The theory and features of the dynamic explicit finite element methods are discussed, the available various commercial FEM codes used for sheet metal forming simulation are introduced. The dynamic explicit FEM code LS-DYNA3D is used for the simulation of a few sheet metal forming processes. Process defects such as wrinkling, local thinning and ruptures are predicted. The design of the tools and the process parameters can thus be improved. The time and the costs of the manufacturing of the tools are reduced, so that it is effective and cost-effective to use the dynamic explicit finite element methods for simulation of sheet metal forming production.