关键词: 等效刚度, 有限元应变能, 紧固件, Python参数化建模, 参数拟合

Abstract: Aiming at the modeling problems of fasteners in complex components,a research method was proposed to establish the axial equivalent stiffness characteristics based on the deformation energy of finite element,and Python was used to develop a fastener structure parametric analysis plug-in suitable for ABAQUS and the research on the two influencing factors of related parameters on the equivalent model was conducted.The test method of dual materials was used to verify the above research and the accuracy of the equivalent model was proved.An equivalent model application plug-in was developed based on the research results of different parameters,and it was applied to the analysis of a high-speed vehicle under-lift structure for numerical verification,which provided an effective research method for modeling complex components with multiple fastening structures.

Key words: equivalent stiffness, finite element strain energy, fastener, Python parametric modeling, parameter fitting