多通道金属挤压塑性流动过程的数值模拟

研制了一套完整的刚塑性有限元分析程序，并在程序中实现了边界自动寻址及识别的理论，解决了移动边界条件及畸变网格自动再生等难题，使得对塑性超大变形的全过程进行无间断连续模拟计算成为现实。本文不仅给出一些有关的重要方法和理论，还针对多通道金属挤压过程给出了计算实例。

Numerical Simulation of Metal Plastic Flow for Multi-Path Extrusion

An integrated rigid-plastic finite element analysis software system has been developed by the authors in recent years. In the programs, we have realized the automatic boundary recognition algorithms for the first time, and have solved the problems of movable boundary and distorted mesh regeneration. Therefore, the whole process of large plastic deformation can be simulated by the computer programs without any interruption in the metal extrusion technology. Because of the physical and geometrical double nonlinear characteristics of the metal plastic flow, it is very difficult to achieve the continous numerical simulation of its whole process. So the authors have studied and established some new theories and algorithms to overcome these difficulties which emerge in the practical simulation. In this paper, some important theories and algorithms have been described, and a computational example has been given.