三维网格动态细化技术在切削仿真中的应用

Application of 3D Mesh Dynamic Refinement Technology in Cutting Simulation

为解决切削加工有限元仿真模型求解速度与精度难以平衡的问题,提出了一种适用于三维有限元模型的网格动态细化算法。该算法的主要功能包括网格细化区域判断、网格细化以及新旧网格物理场传递。采用Python语言对Abaqus软件进行二次开发,将该算法应用于Ti2AlNb钛合金车削加工仿真之中,并最终通过实验验证了仿真模型的准确性。与采用局部网格细化的仿真模型计算结果对比,采用网格动态细化技术的仿真模型求解切削力误差增加了7.3%,求解最大应力误差增加0.2%,求解速度提升174.2%。实现了在保证仿真计算精度的基础上,有效提高运算速度。

Since it is difficult to balance the speed and accuracy of the finite element simulation model of cutting processing,a dynamic mesh refinement algorithm for 3D finite element model is proposed.The functions of the algorithm include mesh refinement area judgment,mesh refinement and transfer of physics fields between new and old meshes.The algorithm is applied to the turning simulation of Ti2AlNb with the secondary development of Abaqus using Python,and the accuracy of the simulation model is verified through experiments.Compared with the simulation results of the local mesh refinement,the simulation using dynamic mesh refinement increases 7.3%in cutting force solution error and increases 0.2%in maximum stress solution error,with an increased 174.2%solution speed.The simulation operation speed is effectively improved while ensuring the calculation accuracy.