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刚塑性有限元法基于速度场迭代求解,故速度场的稳定是至关重要的。防止迭代发散是计算中需重点考虑的问题。本文根据刚塑性有限元法求解过程增量步数多、迭代时间长的特点,从稳定速度场的角度出发,提出了一套防止迭代发散的综合措施,主要包括速度缩减因子和步长增量的自动调节及基于前面两步速度场的速度修正。在采用这些方法仍无效的情况下,可利用直接迭代法在当前状态重新生成速度场。这样处理能保证模拟过程的顺利进行。
Rigid plastic finite element method based on velocity field iterative solution, so the stability of the velocity field is crucial. Preventing iterative divergence is a key consideration in computing. In this paper, according to the rigid-plastic finite element method, a large number of incremental steps are solved and the iterative time is long. From the perspective of stable velocity field, a set of comprehensive measures to prevent iterative divergence is proposed, including speed reduction factor and step increment Automatic adjustment and speed correction based on the two speed fields in the previous step. With these methods still ineffective, direct iteration can be used to regenerate the velocity field in its current state. This treatment can ensure the smooth progress of the simulation process.