典型焊接接头的缺口疲劳曲线分析  

Analysis of Notch Fatigue Curve of Welded Joint

作　　者：孙思远 张开林 SUN Siyuan;ZHANG Kailin(State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学牵引动力国家重点实验室

出　　处：《机械制造与自动化》2019年第3期46-47,89,共3页Machine Building & Automation

基　　金：国家自然科学基金项目(51205324)

摘　　要：缺口应力法作为局部疲劳研究方法,克服了名义应力难以定义和热点应力网格敏感性的困难,因此近年来备受关注。现对对接接头和十字接头试验数据进行重新处理,建立两种焊接接头在缺口应力系统下统一的S-N曲线,并与IIW所推荐的疲劳寿命曲线(m=3,FAT=225)进行比较。结果表明,该曲线具有更高的疲劳等级和更低的斜率,直接用IIW推荐曲线,偏于保守不利于结构轻量化。Notch stress overcomes the difficulty that the nominal stress is used to be difficult to define and hotspot stress mesh sensitivity,so it is paid more attention to in recent years.The paper rehandles the butt joint and cruciform joint experimental data,establishes the two joint S-N curves,and compares the curve to fatigue life curve which is recommended by IIW.The result shows that the curve has higher fatigue level and lower slope.If the curve recommended by IIW is used directly,it tends to be converative and it is against structure lightweight.

关 键 词：缺口应力法 焊接接头 S-N曲线 

分 类 号：TH164[机械工程—机械制造及自动化]