梯形波纹腹板焊接梁疲劳寿命分析  

Fatigue life analysis of welded girders with trapezoidal corrugated webs

作　　者：董亚飞[1] 魏国前[1] 岳旭东[1] 余震[1] 

机构地区：[1]武汉科技大学机械自动化学院,武汉430081

出　　处：《焊接学报》2015年第2期79-82,117,共5页Transactions of The China Welding Institution

基　　金：湖北省自然科学基金资助项目(2014CFB803);湖北省教育厅重点资助项目(D20131102);冶金装备及其控制教育部重点实验室开放基金资助项目(2013A10)

摘　　要：针对梯形波纹腹板焊接梁结构,分别基于不同的表征应力方法(名义应力法、热点应力法、等效结构应力法)建立梁结构的有限元模型,研究焊缝处各表征应力的分布规律,分析裂纹产生的位置,计算疲劳寿命,比较不同表征应力的评定效果.结果表明,名义应力和热点应力的分布曲线相似,存在一定的波纹特性,但根据波纹变化无法准确判断裂纹产生位置及预测疲劳寿命;等效结构应力分布曲线的波纹变化特性十分显著,可较好地预测裂纹产生位置并较准确地估算疲劳寿命.因此建议采用等效结构应力作为梯形波纹腹板焊接梁结构的寿命控制参量.According to the welded girders with trapezoidal corrugated webs,FEA models was established based on several characterization stress methods( nominal stress method,hotspot stress method,equivalent structural stress method),which was used to study characterization stress distribution,analyze crack initiation location,evaluate fatigue life and compare the effect of different characterization stress by different methods.Results show that the nominal stress curve and hot-spot stress curve show the similar distribution with a certain corrugated characteristic,but crack initiation location and fatigue life cannot be determined and predicted exactly. However,equivalent structural stress curve has severe corrugated characteristics which can predict crack initiation location accurately and evaluate the fatigue life reliably. Consequently, equivalent structural stress method was recommended as the control variable to evaluate fatigue life of welded girders with trapezoidal corrugated webs.

关 键 词：梯形波纹腹板 疲劳寿命 名义应力 热点应力 等效结构应力 

分 类 号：TG405[金属学及工艺—焊接]