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提出了动态边界条件处理中修正触模节点位置的一种新方法——初矢修正法 ,从而解决了金属塑性成形三维有限元模拟中由于离散的模具网格造成的“死锁”问题。采用三维刚粘塑性有限元法 ,考虑工模具间的摩擦 ,采用作者所提出的网格重划方法对畸变网格进行重新划分 ,对叶片的锻造过程进行了模拟分析。在模拟过程中的每一加载步 ,均采用本文提出的初矢修正法对触模节点位置进行修正。叶片锻造三维有限元模拟的顺利进行 ,验证了采用本文所提出的初矢修正法修正触模节点的位置 ,可以避免由于离散的模具网格造成的“死锁”。因此该方法不但可行 ,而且可靠。
A new method of correcting the position of the touch node in the dynamic boundary condition processing is proposed, which is the initial vector correction method, which solves the problem of “deadlock” caused by discrete die grids in 3D plastic FEM modeling. Adopting three-dimensional rigid-viscoplastic finite element method, considering the friction between tool and die, the method of re-meshing the grid by the author is used to re-divide the distorted grid and the forging process of the blade is simulated. At each loading step in the simulation process, the initial vector correction method proposed in this paper is used to correct the position of the touch node. The three-dimensional finite element simulation of blade forging is carried out smoothly. It is verified that using the initial vector correction method proposed in this paper to correct the position of the touch node can avoid the “deadlock” caused by the discrete mold grid. Therefore, this method is not only feasible but also reliable.