Finite Element Analysis of Internal Crack Propagation Induced by Contact Fatigue of Rolling Bearing
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摘要: 滚动轴承滚道在工作过程中承受较大的接触应力,接触疲劳是滚动轴承失效的主要形式。为了探究轴承的接触疲劳以及接触疲劳引起的内部裂纹,将损伤力学带入Voronoi有限元方法中,仿真轴承材料拓扑随机性和材料的劣化过程。建立轴承接触疲劳裂纹扩展模型,有效仿真出轴承内部裂纹的萌生、生长、相交、扩展至表面的过程,得到轴承表面裂纹出现的寿命和内部裂纹扩展路径。计算了裂纹扩展过程中所释放的能量,研究内容能够为轴承接触疲劳损伤研究提供新的思路和工具。Abstract: The raceway of rolling bearing is subject to the large contact stress in working process, and contact fatigue is the main kind of bearing failure. In order to investigate the contact fatigue of the bearing and the internal crack induced by the contact fatigue, the present method can accurately simulate the topological randomness of bearing materials and the material fatigue damage process by combining the damage mechanics with the Voronoi finite element method. The contact fatigue crack propagation model for bearing is established, and the process of crack initiation, growth, intersection and propagation to the surface of the raceway is simulated effectively, the life of crack on bearing and the path of crack propagation are obtained. The energy released during crack propagation is calculated. The results can provide new ideas and tools for the study of contact fatigue damage of bearings.
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Key words:
- rolling bearing /
- contact fatigue /
- crack propagation /
- damage mechanics /
- finite element method
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表 1 轴承线接触弹性半空间模型参数
参数 数值 模型宽度 1 000 μm 模型深度 600 μm 单元平均尺寸 10 μm 赫兹接触半径b 100 μm 材料初始弹性模量E 200 GPa 泊松比μ 0.3 -
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