关键词: 螺栓, 有限元法, 三维轴对称模型, 三维螺旋模型, 应力

Abstract:

According to the modeling difficulties and imprecision caused by incomplete thread in the process of finite element analysis for bolt, a spiral modeling method and a simplified three-dimensional axisymmetric modeling method were adopted separately. By comparing the results of stress distribution on each circle of the screws and the maximum of equivalent stress at the roots of the threads calculated from two different numerical models, the reasons for the difference between the two different modeling methods were obtained. The results show that both of the two methods have preferable precision, which ensure accurate analysis of the stress distribution on each node of bolt threads, while the modeling of the spiral modeling method is more difficult. In comparison, the results of the three-dimensional axisymmetric modeling method can reflect the mechanical properties of the axial bolt preferably, and provide the theoretical basis for optimal design of structures.

Key words: bolt, finite element method, three-dimensional axisymmetric model, three-dimensional spiral model, stress