基于结构应力法的起重机焊缝多轴疲劳寿命研究  

RESEARCH ON MULTI-AXIAL FATIGUE LIFE OF CRANE WELD BASED ON STRUCTURAL STRESS METHOD

作　　者：王欣[1] 岳增可 蔡福海 付河灵 许成斌 WANG Xin;YUE ZengKe;CAI FuHai;FU HeLing;XU ChengBin(School of Mechanical Engineering,Dalian University of Technology,Dalian 116023,China;Changzhou Vocational Institute of Mechatronic Technology,Changzhou 213164,China)

机构地区：[1]大连理工大学机械工程学院,大连116023 [2]常州机电职业技术学院,常州213164

出　　处：《机械强度》2022年第5期1226-1231,共6页Journal of Mechanical Strength

基　　金：江苏省高等学校自然科学研究项目(18KJB460002)资助。

摘　　要：以580 t级龙门起重机主梁与刚腿连接处焊缝为例,基于结构应力法分析起重机作业的应力历程,确定多轴非比例的应力特征。建立危险位置处具有焊缝细节的壳-实体混合模型,借助Ansys和Fe-Safe软件的Verity模块,结合载荷谱获取多轴结构应力。通过基于路径依赖的循环计数法(PDMR)确定损伤累积路径,引入载荷路径力矩(MLP)概念,将非比例加载路径向比例加载路径转化。根据主S-N曲线估算焊缝处疲劳寿命,并与多轴比例加载寿命分析方法、单轴等效结构应力寿命分析方法的计算结果对比,表明多轴非比例变幅应力的疲劳分析方法的必要性,这为起重机复杂的多轴疲劳分析提供参考与借鉴。As an example of life evaluation of the weld between main girder and rigid leg of 580 t gantry crane based on structural stress method,the non-proportional stress characteristics of multi-axis are obtained by analyzing the working stress history of crane.The shell-solid mixed model with weld details in the dangerous position is built,and the multi-axial structural stress is obtained by combining the load spectrum with the ANSYS and Verity module of FE-SAFE software.The damage accumulation path is obtained by Path Dependent Maximum Range(PDMR).Moment of Load Path(MLP)is introduced to realize the transformation from non-proportional loading path to proportional loading path.The fatigue life of the weld is estimated according to the master S-N curve and compared with the multi-axis proportional and uni-axial life estimation methods.It shows the necessity of multi-axial non-proportional fatigue analysis method,which provides reference for the complex multi-axial fatigue analysis of cranes.

关 键 词：结构应力法 多轴疲劳 非比例加载路径 等效结构应力 

分 类 号：TH213.5[机械工程—机械制造及自动化]