基于模态叠加法的焊接结构疲劳寿命预测方法研究  

Fatigue life prediction of welded structures based on modal superposition method

作　　者：方吉[1] 兆文忠[1] 朴明伟[1] 

机构地区：[1]大连交通大学交通运输工程学院,大连116028

出　　处：《振动与冲击》2015年第5期186-192,共7页Journal of Vibration and Shock

基　　金：国家高技术研究发展计划(863计划)(2012AA040912);铁道部科技研究开发计划(2012G002-11)

摘　　要：针对焊接结构疲劳寿命预测,从动力学的角度提出了一种基于模态叠加法的动态结构应计算方法,并验证了其可行性与正确性,该方法以时变载荷作用下焊接结构的动平衡为基础,考虑结构自身振动加速度对用于评价焊缝疲劳寿命的结构应力的影响,实现了动态载荷下焊接结构的动态结构应力计算,有效地拓宽了主S-N曲线疲劳预测方法的应用领域。For welded structure＇s fatigue life prediction,a method of structural dynamic stress calculation based on the mode superposition method was proposed. The feasibility and accuracy of the method were verified. The method was based on the dynamic equilibrium of welded structures under time-varying loads,considering the effect of structural vibration acceleration on structural stress used to predict the fatigue life of welded structures. The structural dynamic stress calculation of welded structures under dynamic loading was realized with the proposed method and the application of the master S-N curve fatigue prediction method was broadened effectively.

关 键 词：动态结构应力 动力学 主S-N曲线法 焊接结构疲劳寿命预测 

分 类 号：TB122[理学—工程力学]