计算力学学报2016，Vol.33Issue(6)：938-944,7.DOI:10.7511/jslx201606021
基于简化模型仿真的内螺纹应力分析方法研究
Research on stress analyzing approach of internal threads based on simplified-model simulation
龙旦风 1黄成海 2徐卫国 1向东 1王一江 3江伟1
作者信息
- 1. 一汽解放汽车有限公司无锡柴油机厂，无锡214026
- 2. 清华大学机械工程系，北京100084
- 3. 清华大学机械工程系，北京100084
- 折叠
摘要
Abstract
Internal threads in mechanical parts are in general the weak links as to fatigue strength .How‐ever ,simplified FEA models without threads rather than detailed models with threads are usually used in engineering application due to modeling difficulty ,heavy computational burden and numerical conver‐gence problems of detailed models ,and thus the stress concentration at thread roots is ignored in such simulations .For this reason ,a state‐of‐the‐art calculation approach of the stress at internal‐thread roots is proposed .In this approach the stress at the internal‐thread root is decomposed into a near‐source component and a far‐source component ,and correspondingly the concepts as well as obtaining technique of near‐source stress conversion matrix and far‐source stress conversion matrix are put forward ,with w hich the simulation results of the simplified model can be converted to the near‐source stress and far‐source stress and they are summed to get the maximum stress at the thread root .Calculation results show that the stress conversion approach attains the accuracy of simulation with detailed models basically .Especially at the position easily to fatigue ,namely the root of the first engaged thread near the bottom of the screwed hole ,the results from the stress conversion approach agree well with those from the detailed model simulation ,in consequence the validity and the accuracy of the stress conversion approach are demonstrated .关键词
内螺纹/螺纹根部/应力集中/最大应力/疲劳强度Key words
internal thread/thread root/stress concentration/maximum stress/fatigue strength分类
机械制造引用本文复制引用
龙旦风,黄成海,徐卫国,向东,王一江,江伟..基于简化模型仿真的内螺纹应力分析方法研究[J].计算力学学报,2016,33(6):938-944,7.
