Research on fatigue damage of metro frame based on effective notch stress

JIANG Chaoyong; ZHAO Xinyuan; WEI Wei; CHEN Can; WANG Binjie; LI Qiang

doi:10.13890/j.issn.1000-128X.2022.02.019

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Research on fatigue damage of metro frame based on effective notch stress

Structure Design and Simulation | 更新时间：2024-08-02

- Research on fatigue damage of metro frame based on effective notch stress
- Electric drive for locomotives Issue 2, Pages: 135-140(2022)
- 作者机构：
  
  1.中车长春轨道客车股份有限公司，吉林长春　　130062
  2.北京交通大学机械与电子控制工程学院，北京　100044
  3.中国铁道科学研究院集团有限公司机车车辆研究所，北京;100081
- 作者简介：
- 基金信息：
- DOI：10.13890/j.issn.1000-128X.2022.02.019
  CLC： U270;U231
- Published：10 March 2022，
  
  Received：31 January 2022，
  
  Revised：02 March 2022，
- 稿件说明：
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JIANG Chaoyong, ZHAO Xinyuan, WEI Wei, et al. Research on fatigue damage of metro frame based on effective notch stress. [J]. Electric drive for locomotives (2):135-140(2022)
DOI：

JIANG Chaoyong, ZHAO Xinyuan, WEI Wei, et al. Research on fatigue damage of metro frame based on effective notch stress. [J]. Electric drive for locomotives (2):135-140(2022) DOI： 10.13890/j.issn.1000-128X.2022.02.019.

摘要

地铁构架的疲劳失效在焊接接头的焊趾和焊根处均有可能发生，因此需要一种有效的疲劳评估方法来全面地分析转向架的疲劳可靠性。针对该问题，基于有效缺口应力法建立了某地铁转向架构架整体有限元模型，以及电机吊座翼板与横梁连接部位焊接接头的局部网格细化有限元模型，得到了焊接接头焊趾和焊根处的有效缺口应力分布。根据Miner损伤理论和对应的S-N曲线计算得到有效缺口应力法与名义应力法的累积损伤。结果表明，接头焊根处更易发生疲劳失效。此外，有效缺口应力法比名义应力法更加安全。为进一步研究不同载荷对损伤的影响，通过对比各载荷的累积损伤结果发现：对于有效缺口应力，损伤占比较大的5种载荷分别是扭转载荷、电机横向载荷、电机垂向振动载荷、电机驱动载荷、齿轮箱垂向振动载荷，其中扭转载荷占比最大，达30%~60%。文章验证了有效缺口应力法在地铁车辆构架疲劳评价中的安全性和适用性。

Abstract

The fatigue failure of metro frame may occur at the weld toe and weld root of the welded joint. Therefore

an effective fatigue evaluation method is needed to analyze the fatigue reliability of the bogie comprehensively. To solve this problem

based on the effective notch stress method

the overall finite element model of one metro frame and the local mesh refinement finite element model of the welded joint between the wing plate of the motor suspension seat and the cross beam were established

and the effective notch stress distribution at the weld toe and weld root of the welded joint was obtained. According to Miner damage theory and the corresponding S-N curve

the cumulative damage of effective notch stress method and nominal stress method were calculated. The results show that fatigue failure is more likely to occur at the root of the joint. In addition

the effective notch stress method is safer than the nominal stress method. For further study the influence of different loads on damage

by comparing the cumulative damage results of each load

it was found that for the effective notch stress

the five loads with large damage are torsional load

motor transverse load

motor vertical vibration load

motor driving load and gearbox vertical vibration load

of which the torsional load accounts for the largest proportion

up to 30%-60%. The safety and applicability of the effective notch stress method in the fatigue evaluation of subway vehicle frame was verified.

关键词

地铁构架电机吊座焊接接头有效缺口应力名义应力疲劳损伤地铁车辆

Keywords

metro framemotor hangerwelded jointseffective notch stressnominal stressfatigue damagemetro vehicles

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