淬冷过程非线性有限元分析的单元选择

用有限元法模拟工件淬冷过程,实现温度场与相变的耦合计算时,考虑到形状的复杂性以及非线性物性参数、相变潜热等多种复杂因素的影响,选择有限元单元时必须十分谨慎。本文选择不同类型的单元以及网格的疏密来进行对比,最终确定八结点六面体单元计算时既能满足计算精度的要求又使计算量不致过大,使硬件资源得以充分利用,并讨论了畸形单元对计算结果的影响。

The Element Selection of Non\|linear Finite Element Analysis in the Process of Quenching

Because of the effect of the complex shape, non\|linear physical parameters and the latent heat during phase transformation, element selection should be carefully done in order to obtain good results when using FEM to simulate the quenching process of the workpiece and realize the coupled calculation of the temperature field and phase transformation. In this paper, through comparing the type and density of different elements, the eight\|node, hexahedral, isoparametric element is a good choice at last. This kind of element not only meets the need of calculating accuracy, but also cuts down the calculating magnitude and takes full advantage of the hardware source. The effect of distorted elements on the calculation result has also been discussed.