基于三维精确建模法的螺栓有限元分析  

Finite Element Analysis on Bolted Joints Based on Three-dimensional Accurate Modeling Method

作　　者：何平[1,2] 刘光复[1] 谷叶水 周丹[1] 黄海鸿[1] 王雁[1] 

机构地区：[1]合肥工业大学,合肥230009 [2]安徽建筑工业学院,合肥230601 [3]吉孚动力技术(中国)有限公司,苏州215024

出　　处：《中国机械工程》2012年第16期1991-1996,共6页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(50775061);安徽省教育厅自然科学基金资助项目(KJ2011B050)

摘　　要：针对螺栓有限元分析建模困难和不完整螺纹造成计算精度不高的问题,分别采用三维螺旋模型和三维轴对称简化模型进行有限元计算,分别比较分析了对应各圈螺纹沿外轮廓方向的应力分布和螺纹牙根部最大等效应力。结果表明,两种模型均可较精确地计算出螺栓螺纹上各节点的应力,但三维螺旋模型法建模较困难、计算成本较高,三维轴对称简化模型法的计算结果能较好地反映螺栓的轴向力学特性,研究结果为改进螺栓连接受力状况和结构优化设计提供了理论依据。According to the modeling difficuhies and imprecision caused by incomplete thread in the process of finite element analysis for bolt, a spiral modeling method and a simplified three--di- mensional 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 re- suits 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.

关 键 词：螺栓 有限元法 三维轴对称模型 三维螺旋模型 应力 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]