焊接结构切口等效应力修正方法研究与应用分析  

Correction Method of Notch Equivalent Stress of Welded Structure and Application Analysis

作　　者：张哲 王悦东 刘本末 ZHANG Zhe;WANG Yuedong;LIU Benmo(College of Locomotive and Rolling stock Engineering,Dalian Jiaotong University,Dalian 116028,Liaoning,China)

机构地区：[1]大连交通大学机车车辆工程学院,辽宁大连116028

出　　处：《机械科学与技术》2022年第8期1254-1260,共7页Mechanical Science and Technology for Aerospace Engineering

基　　金：大连市科技创新基金计划项目(2019J11CY017);国铁集团科技研究开发计划项目(K2021J006)。

摘　　要：为了提高16Mn钢焊接接头疲劳寿命预测的准确程度,首先应用3种不同方法对十字焊接接头的疲劳寿命进行预测,验证了切口应力等效取值法考虑了应力集中对16Mn钢疲劳寿命的影响。其次,采用基于切口应力强度因子理论的切口应力等效取值法对焊接接头的疲劳寿命进行预测。与试验结果对比表明:应用切口应力等效取值法对16Mn钢焊接接头寿命的评估结果存在误差。结合16Mn钢十字焊接接头试验结果,引入切口等效应力修正系数,得到适用于16Mn钢常用焊接接头的修正切口等效应力公式。In order to improve the accuracy of the fatigue life prediction of 16Mn steel welded joints,this article first uses three different methods to predict the fatigue life of cross welded joints respectively,and verifies that the notch stress equivalent value method considers the effect of stress concentration on the fatigue life of 16Mn steel.Secondly,the notch stress equivalent value method based on notch stress intensity factor theory is used to predict the fatigue life of welded joints again.The comparison with the test results shows that there is larger error in the evaluation results of the 16Mn steel welded joint life using the notch stress equivalent value method.Combined with the test results of 16Mn steel cross welded joints,the notch equivalent stress correction coefficient is introduced,and a modified notch equivalent stress formula suitable for commonly used 16Mn steel welded joints is obtained.

关 键 词：修正切口等效应力法 16MN钢 疲劳寿命 焊接结构 

分 类 号：U270.38[机械工程—车辆工程]