Study on Internal Fatigue Crack Initiation and Propagation Direction of Wind Turbine Gearbox Bearings

Haibo Sun; Feng Shen

doi:10.16578/j.issn.1004.2539.2022.08.006

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Study on Internal Fatigue Crack Initiation and Propagation Direction of Wind Turbine Gearbox Bearings

Theory·Reserach | 更新时间：2022-09-23

- Study on Internal Fatigue Crack Initiation and Propagation Direction of Wind Turbine Gearbox Bearings
- Journal of Mechanical Transmission Vol. 46, Issue 8, Pages: 33-38(2022)
- 作者机构：
  
  1.南京高速齿轮制造有限公司，江苏南京 211100
- 作者简介：
- 基金信息：
- DOI：10.16578/j.issn.1004.2539.2022.08.006
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孙海波,沈峰.风电齿轮箱轴承内部疲劳裂纹萌生与扩展方向研究[J].机械传动,2022,46(08):33-38.

Sun Haibo,Shen Feng.Study on Internal Fatigue Crack Initiation and Propagation Direction of Wind Turbine Gearbox Bearings[J].Journal of Mechanical Transmission,2022,46(08):33-38.
孙海波,沈峰.风电齿轮箱轴承内部疲劳裂纹萌生与扩展方向研究[J].机械传动,2022,46(08):33-38. DOI： 10.16578/j.issn.1004.2539.2022.08.006.

Sun Haibo,Shen Feng.Study on Internal Fatigue Crack Initiation and Propagation Direction of Wind Turbine Gearbox Bearings[J].Journal of Mechanical Transmission,2022,46(08):33-38. DOI： 10.16578/j.issn.1004.2539.2022.08.006.

摘要

针对风电齿轮箱轴承疲劳裂纹萌生方向的问题，通过理论研究，认为裂纹萌生的方向取决于萌生局部位置最大切应力幅所在平面方向。经计算发现，轴承滚道内部浅层位置正交切应力幅大于主切应力幅，较深位置主切应力幅大于正交切应力幅；裂纹萌生角度随萌生深度不同而变化。针对裂纹扩展问题，利用断裂力学裂纹尖端极坐标应力叠加的方法，明确了Hertz接触应力、残余应力、装配过盈压力等对裂纹扩展方向的影响，通过分析不同热处理金相组织的轴承失效案例，验证了理论的适用性。

Abstract

The fatigue crack initiation direction of wind turbine gearbox bearings is investigated. Through theoretical research，it is believed that the direction of crack initiation depends on the direction of the maximum shear stress amplitude plane at the local initiation position. After calculation，it is found that the orthogonal shear stress amplitude of the shallow layer inside the bearing raceway is greater than the principal shear stress amplitude，and the principal shear stress amplitude at the deeper layer is greater than the orthogonal shear stress amplitude. Therefore，the crack initiation angle varies with the initiation depth. Aiming at the problem of crack propagation，the method of stress superposition in the polar coordinate of the crack tip in fracture mechanics is used to clarify the influence of Hertz contact stress，residual stress，assembly interference pressure，etc. on the direction of crack propagation. The applicability of the theory is verified by analyzing the failure cases of bearings with different thermal treatment microstructure.

关键词

轴承失效裂纹萌生裂纹扩展方向Hertz接触残余应力

Keywords

Bearing failureCrack initiationCrack propagation directionHertz contactResidual stress

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