基于主 S-N曲线法对转向架构架焊缝疲劳损伤的分析

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中图分类号：U270.2 文献标志码：B doi：10.20213/j.cnki.tdcl.2025.0l.006

Abstract：Based on the main S-N curve method，the fatigue damage of the important welds of high-speed trainbogie frames are calculated and analyzed by combining multi-body dynamics with finite element analysis of structural dynamics in this paper.The analysis results show that the dangerous points of the longitudinal weld of the side beam are located at the junction between the cross bearer and the side beam，and the weld of the lower cover plate of the side beam is much more damaged than that of the upper cover plate，and the critical points of the circumferential weld of the cross bearer are located near the side weld of the cross bearer，and the damage curve is symmetrically distributed.

Key words：weld joint; structural stress method;fatigue damage;vehicle dynamics；bogie frame

转向架焊接构架是铁路车辆的关键承载部件，服役载荷复杂，而且焊缝存在应力集中和焊接缺陷，是疲劳失效的主要源头，因此准确评估焊缝疲劳寿命或损伤成为转向架构架抗疲劳设计的一项重要内容，其关键在于获得真实的载荷和准确可靠的疲劳寿命评估方法。（剩余4836字）