中国机械工程2025，Vol.36Issue(5)：923-932,10.DOI:10.3969/j.issn.1004-132X.2025.05.004
螺栓预紧状态下螺纹扩展应力分析
Thread Extension Stress Analysis of Bolts under Pre-tensioning Conditions
摘要
Abstract
It was difficult to accurately determine the thread stresses on the bolts under pre-tensionsing conditions,which might lead to strength fracture and premature loosening of the threads,and the reliability of the bolt joints was compromised.Currently,the contact state of the thread sur-faces was usually described by stresses under an absolute coordinate system.However,the simulated stress direction was at an angle to the actual thread surface.The analysis results were not intuitive.Therefore,a thread mathematical model was derived and the extended stress analysis method of thread contact surfaces was proposed.Then,the finite element model of bolt joints was established for the structural characteristics of bolts.And the accuracy of the model was verified by tests.Finally,the extended stress analysis method was applied to study the thread surface stress and the distribution characteristics of bolts.The results show that the maximum error between the simulated preload and the testing preload is only 5.78%,where the accuracy of the simulation model is demonstrated.The extension stress analysis method may reflect the continuity and monotonicity of the stress distribution on the thread surfaces,and the method also reflects the optimal preload.The decreasing rate of the stress on the same layer thread is inversely proportional to the stress.From the stress analysis,the reason why the stresses on the thread are mainly concentrated in the first three turns is illustrated.The thread extension stress analysis method proposed herein is more intuitive and accurate.The paper may provide theoretical support for the anti-loosening analysis and reliability analysis of bolts.关键词
预紧力/螺栓连接/螺纹/螺纹面数学模型/应力分布Key words
preload/bolt joint/thread/mathematical modeling of threaded surface/stress distri-bution分类
机械工程引用本文复制引用
关焦月,高源,艾延廷,田晶,姚玉东..螺栓预紧状态下螺纹扩展应力分析[J].中国机械工程,2025,36(5):923-932,10.基金项目
国家自然科学基金(12172231) （12172231）
辽宁省属本科高校基本科研业务费专项资金 （）
沈阳市中青年科技创新人才支持计划(RC220439) （RC220439）
