The AA7075-T6 material was selected as the research object,and its grain and grain boundary characterization characteristics were analyzed by comparing three widely used modeling methods.Three modeling methods were seamlessly integrated into Abaqus software using Python language,and parametric modeling of crystal models was implemented.Three crystal finite element models were established and numerically simulated using this software.The results show that under the same setting conditions the more uniform the grain size in the model is,the more normal the area distribution curve of the grain tends to be,and the faster the evolution of the damage process of the cohesive unit at the grain boundaries.The more the small grains distributed near the boundary,the more likely the cracks appear.The cohesive force units of different crystal models exhibit different evolution patterns under the same damage parameters influenced by grain size.The grain units near the grain boundary units exhibit plastic evolution laws consistent with the experimental results during tensile fracture,and their damage evolution speeds are related to the damage speeds in the cohesive unit.
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