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Cohesive zone modeling of intergranular fatigue damage in rolling contacts

机译:滚动接触中晶间疲劳损伤的内聚区建模

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摘要

Fatigue lives of rolling element bearings exhibit much scatter due to the statistical nature of the failure process. The localized character of contact stresses enhances the effects of microstructural features on fatigue life. In this paper, the growth of intergranular fatigue damage in rolling contacts is investigated. An explicit finite element model is developed which models the grain boundaries using an irreversible cohesive zone approach. The effects that the grain boundary properties play in fatigue life scatter and final spall patterns are presented and discussed. The predicted fatigue lives and spall patterns were found to be similar to experimental results.
机译:由于失效过程的统计性质,滚动轴承的疲劳寿命表现出很大的分散性。接触应力的局部特征增强了微结构特征对疲劳寿命的影响。本文研究了滚动接触中晶间疲劳损伤的增长。建立了显式的有限元模型,该模型使用不可逆的内聚区方法对晶界进行建模。提出并讨论了晶界特性在疲劳寿命分散和最终剥落模式中的作用。发现预测的疲劳寿命和剥落模式与实验结果相似。

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