摘要
根据节点几何特征,提出焊缝坐标系的建立方法,计算节点在焊缝坐标系下的应力分量。参照DVS1612标准,提出基于多轴准则的结构疲劳强度分析方法。对地铁车辆转向架焊接构架典型焊缝的疲劳强度进行评估,指出所研究焊缝的疲劳强度主要受正应力分量的影响,剪应力对结构疲劳强度的影响较小。对比研究了不同分析方法下的节点材料利用度特征。结果表明,在压缩应力占主导的区域,基于多轴准则的分析方法将使评估结果偏于安全;对于抗疲劳能力较差的接头,基于多轴准则的分析方法,采用DVS 1612标准提供的疲劳曲线将获得偏于保守的计算结果。
According to the geometrical characteristics of the nodes, the method of establishing the weld coordinate system was proposed, and the stress components of each node in the weld coordinate system were calculated. Referring to the standard DVS 1612, a structural fatigue strength analysis method based on multi-axial criteria was proposed. The fatigue strength of the typical welds in the welded frame of metro bogie was evaluated. It was pointed out that the fatigue strength of the studied welds was mainly affected by the normal stress components, and the shear stress had little effect on the structural fatigue strength. The characteristics of node material availability under different analysis methods were compared. The results showed that in the area dominated by compressive stress, the analysis methods based on multi-axial criteria would make the assessment results safety. For joints with lower fatigue resistance, based on the analysis method of the multi-axial criterion, conservatively calculated results would be obtained according to the fatigue curves provided by the DVS 1612 standard.
作者
安琪
赵华
刘志远
王绪英
AN Qi;ZHAO Hua;LIU Zhiyuan;WANG Xuying(Mechanics Post-doctoral Research Station,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;School of Mechanics and Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;National Engineering Technology and Research Centre for System Integration of Railway Vehicle, CRRC Changehun Railway Vehicles Co.,Ltd.,Changchun,Jilin 130062,China)
出处
《机车电传动》
北大核心
2019年第1期72-77,共6页
Electric Drive for Locomotives
关键词
转向架
焊接构架
焊缝坐标系
疲劳强度
多轴疲劳准则
bogie
welded frame
weld coordinate
fatigue strength
multi-axial fatigue criteria
