Gear fatigue issues, including bending and contact fatigue, are attractive problems with significant engineering safety implications. Currently, no fatigue analysis model can combine the effects of bending and contact fatigue to predict gear fatigue life because of their different failure mechanisms. In addition, most gear fatigue studies are still limited to the understanding at the macro level, thus cannot provide theoretical interpretations for practical engineering observations such as scattered experimental data and material deterioration. Here, we proposed a unified microstructure model by considering different failure mechanisms of rolling contact and bending fatigue. The crystal plasticity model combing the multiaxial fatigue criteria was established to capture the stress–strain history at the microlevel. The deterioration of mechanical properties of the material was simulated based on the continuum damage theory. This work provides more insight into the physical understanding of gear fatigue failure mechanism and theoretical support for gear antifatigue design.

中文翻译：

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基于晶体塑性建模的齿轮滚动接触疲劳和弯曲疲劳损伤行为

齿轮疲劳问题，包括弯曲和接触疲劳，是具有重大工程安全意义的有吸引力的问题。由于其失效机理不同，目前还没有疲劳分析模型可以结合弯曲和接触疲劳的影响来预测齿轮的疲劳寿命。此外，大多数齿轮疲劳研究仍局限于宏观层面的理解，无法为分散的实验数据和材料劣化等实际工程观察提供理论解释。在这里，我们通过考虑滚动接触和弯曲疲劳的不同失效机制提出了统一的微观结构模型。建立了结合多轴疲劳准则的晶体塑性模型，以捕捉微观层面的应力-应变历史。基于连续损伤理论对材料力学性能的劣化进行了模拟。这项工作为齿轮疲劳失效机制的物理理解和齿轮抗疲劳设计的理论支持提供了更多的见解。