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PPS thrust ball bearing failures under rolling contact fatigue (RCF) in water were caused by flaking. Crack propagation was the main reason of the flaking failure. Subsurface cracks grew in a direction which was parallel to the surface caused the flaking. To investigate the distribution of maximum values of the crack depths, we observed subsurface cracks in whole cross-sections and surface cracks in the present work. The subsurface cracks on whole cross-sections were observed with LCM. The whole cross-section observation was started from the boundary between outer shoulder and groove. The observations were made at intervals of 0.1 or 0.25 mm. The distribution of the maximum values of crack depths and the deepest cracks among all sections were obtained. The deepest cracks among all sections were distributed between the outer shoulder and the centre of contact groove. The positions of maximum values of crack depths distribute around crack initiation area and the deepest cracks are located between the centre of the contact groove and the outer shoulder.

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Maximum Depth Distribution of Flaking Failure of PPS Thrust Bearing Under Rolling Contact Fatigue of 290 N in Water

  • 会议论文

  • 发表日期：

    2025年

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  • Tomonori Harada,
  • Shuhei Kajiwara,
  • Katsuyuki Kida

摘要

PPS thrust ball bearing failures under rolling contact fatigue (RCF) in water were caused by flaking. Crack propagation was the main reason of the flaking failure. Subsurface cracks grew in a direction which was parallel to the surface caused the flaking. To investigate the distribution of maximum values of the crack depths, we observed subsurface cracks in whole cross-sections and surface cracks in the present work. The subsurface cracks on whole cross-sections were observed with LCM. The whole cross-section observation was started from the boundary between outer shoulder and groove. The observations were made at intervals of 0.1 or 0.25 mm. The distribution of the maximum values of crack depths and the deepest cracks among all sections were obtained. The deepest cracks among all sections were distributed between the outer shoulder and the centre of contact groove. The positions of maximum values of crack depths distribute around crack initiation area and the deepest cracks are located between the centre of the contact groove and the outer shoulder.