基于结构应力的焊接接头疲劳分析  

Fatigue analysis of welded joints by method of structural stress

作　　者：武奇[1] 邱惠清[1] 王伟生[1] 

机构地区：[1]同济大学机械工程学院,上海201804

出　　处：《焊接学报》2009年第3期101-105,共5页Transactions of The China Welding Institution

基　　金：国家科技支撑计划基金资助项目(2007BAF10B00)

摘　　要：基于结构应力法对来自相关文献中的16Mn钢十字非承载焊接接头、十字承载接头和纵向立板角焊缝接头的疲劳强度的试验数据进行了分析.推导了适合有限元计算的离散结构应力计算公式,得到焊接接头的结构应力集中系数.证实了该方法具有网格划分不敏感性,给出了应用结构应力法进行疲劳评定时适合上述各类接头的结构应力S-N曲线.结果表明,同名义应力法相比较,采用结构应力表示的焊接接头疲劳试验数据其分散性较小.Based on the structural stress method,some data of the fatigue strength of 16Mn,which include non-carrying-load fillet cruciform joints,carrying-load fillet cruciform joints and welded joints with longitudinal fillet welded gusset,are analyzed.The discrete structural stress formula which suits for finite element method are deduced,structural stress concentration factors for joints are obtained,and structural S-N curves for these joints are provided.The approach shows the good mesh-size insensitive characteristics.Compared with the nominal stress method,the dispersity of experimental data evaluated by structural stress method is reduced.

关 键 词：焊接接头 疲劳评定 结构应力 

分 类 号：TG304[金属学及工艺—金属压力加工]