关键词: 螺栓连接, 层单元, 多点约束, 有限元法, 模态分析

Abstract:

For its enormous time consumption,the method to simulate preloads of bolt connected structures using preload elements in FEM software is not suitable for engineering calculation of large structures.Based on the platform of  FEM software MSC./Patran,simulating bolt connected structure with cell elements,a finite element model of a typical “L” shape bolt connected structure was built by using cell element method and multiple point constrain technique,and the modal analysis of the structure was carried out.The modal analysis results were compared with the results regarding the bolt connected structure as a whole body and with the results of experimental modal analysis.It's shown that the above method takes a relative short time to calculate modal results,however the calculated results are in agreement with the experiments.This paper provides an accurate and reliable FEM to calculate bolt connected structure with preloads on it,and it has reference value for finite element modeling and vibration modal analysis for complex bolt connected structures with preloads in engineering.

Key words: bolt connected, cell element, multiple point constraint, finite element method(FEM), modal analysis