Bending Fatigue Crack Analysis of the Subway Gearbox Gear

Zhu Hekai; Yang Jianwei; Li Xin

doi:10.16578/j.issn.1004.2539.2018.10.030

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Bending Fatigue Crack Analysis of the Subway Gearbox Gear

更新时间：2022-10-20

- Bending Fatigue Crack Analysis of the Subway Gearbox Gear
- Vol. 42, Issue 10, Pages: 166-170(2018)
- 作者机构：
  
  1. 北京建筑大学城市轨道交通车辆服役性能保障北京市重点实验室
  2. 北京建筑大学机电与车辆工程学院
- 作者简介：
- 基金信息：
- DOI：10.16578/j.issn.1004.2539.2018.10.030
  CLC：
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[1]祝赫锴,杨建伟,李欣.某地铁齿轮箱齿轮弯曲疲劳裂纹分析[J].机械传动,2018,42(10):166-170.

Zhu Hekai, Yang Jianwei, Li Xin. Bending Fatigue Crack Analysis of the Subway Gearbox Gear. [J]. 42(10):166-170(2018)
[1]祝赫锴,杨建伟,李欣.某地铁齿轮箱齿轮弯曲疲劳裂纹分析[J].机械传动,2018,42(10):166-170. DOI： 10.16578/j.issn.1004.2539.2018.10.030.

Zhu Hekai, Yang Jianwei, Li Xin. Bending Fatigue Crack Analysis of the Subway Gearbox Gear. [J]. 42(10):166-170(2018) DOI： 10.16578/j.issn.1004.2539.2018.10.030.

摘要

结合动力学仿真和扩展有限单元法（XFEM）,对某城轨车辆齿轮箱齿轮进行裂纹扩展分析。通过动力学分析,确定扩展有限元模型初始裂纹的位置及载荷加载位置;建立扩展有限元模型,对计算结果进行分析,总结齿轮齿根裂纹扩展规律。结果表明,齿根处最大弯曲应力位置不随齿轮啮合过程而改变,裂纹起裂位置应在此位置附近;裂纹尖端应力值在量化一裂纹长度到达0. 61前低速率稳定增加,0. 61后裂纹进入瞬断区,裂纹尖端应力值变化明显;结合有限元动力学及扩展有限元分析发现,裂纹扩展初期属于Ⅰ型裂纹,在裂纹扩展的中后期属于Ⅰ、Ⅱ混合型裂纹;不同加载位置结果显示,扩展初期裂纹偏转角度随着加载位置的下移而减小,扩展后期裂纹整体沿着齿厚方向进行扩展。

Abstract

The crack propagation analysis of the gearbox gear of a urban rail vehicle is carried out by combining the dynamics simulation and the extended finite element method（ XFEM）. Based on the dynamics analysis,the location of the initial crack and load loading in the finite element model are determined. An extended finite element model is established and the calculation results are analyzed. The law of tooth root crack growth is summarized. The results show,the location of the maximum bending stress at the root doesn’t change with the gear meshing process,and the crack initiation location should be near this location. At the crack tip stress,the low rate steadily increases until the crack length reaches 0. 61. After 0. 61,the crack enters the instantaneous region and the crack tip stress changes obviously. Based on the finite element analysis and finite element analysis,it is found that the initial crack belongs to type I crack and belongs to I and II mixed crack in the middle and later stages of crack propagation. The results of different loading positions show that the initial crack deflection angle decreases with the downward loading of the loading position,and the crack propagates laterally along the thickness direction.

关键词

齿轮动力学裂纹扩展XFEM

Keywords

GearDynamicsCrack propagationXFEM

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