多晶体材料微观组织三维有限元建模方法

Based on the summary and analysis of the existing microstructure based three-dimensional(3D) finite element modeling methods for polycrystalline materials, a 3D finite element modeling method considering actual grain and grain boundary morphology was proposed, and the detailed modeling process was described with the example of IMI834 titanium alloy. The 3D finite element model was constructed by continuous sectioning method and image numeralization method. Based on the shared node recognition method, the grain boundary elements with a geometry thickness were generated, and then the high-efficiency description of actual microstructure and grain boundary morphology of IMI834 titanium alloy was realized. The actual grain orientations were mapped on the finite elements, and the simulation of the polycrystalline material was realized by applying boundary conditions. It can be found that the 3D finite element modeling method for polycrystalline materials is applicable to predict the heterogeneous deformation and the gliding and damage of grain boundaries of polycrystalline materials.