Material Inclusion Factors for Lundberg-Palmgren–Based RCF Life Equations
Material Inclusion Factors for Lundberg-Palmgren–Based RCF Life Equations
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DOI：
10.1080/10402004.2011.560412
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发表时间：
2011-03
影响因子：
2.1
通讯作者：
B. Jalalahmadi;F. Sadeghi;V. Bakolas
中科院分区：
文献类型：
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作者：
B. Jalalahmadi;F. Sadeghi;V. Bakolas
氢脆、碳化物等形式的材料夹杂物，是制造过程的副产品，通常存在于轴承钢中。本研究的目的是开发一个寿命方程的滚动接触疲劳现象，占夹杂物的影响。使用先前使用损伤模型获得的疲劳结果开发寿命方程（Jalalahmadi和Sadeghi，摩擦学杂志第132卷，2010年）。考虑夹杂物的刚度、尺寸、深度和数量对寿命方程的影响，采用四个修正因子对寿命方程进行修正。这些修正系数是从Voronoi有限元（FE）模型和基于Lundberg-Palmgren的疲劳准则（Jalalahmadi和Sadeghi，摩擦学杂志第131卷，2009年）获得的模拟中提取的。这些模拟预测的Weibull斜率和L10的生活是在良好的协议与以前的理论和实验结果。可以看出，随着夹杂物变得更大或更浅，它们会导致疲劳寿命及其分散性的更大降低。此外，引入更多的夹杂物的材料显着降低疲劳寿命和他们的威布尔斜率。
Material inclusions in the form of hydrogen embrittlement, carbides, etc., are by-products of manufacturing processes and commonly present in bearing steel. The objective of this study was to develop a life equation for rolling contact fatigue phenomenon that accounts for the effects of inclusions. The life equation was developed using the fatigue results previously obtained using the damage model (Jalalahmadi and Sadeghi, Journal of Tribology vol. 132, 2010). Four modifying factors counting for effects of the stiffness, size, depth, and number of the inclusions are used to modify the life equation. These modifying coefficients are extracted from the simulations obtained from the Voronoi Finite element (FE) model and the Lundberg-Palmgren-based fatigue criterion (Jalalahmadi and Sadeghi, Journal of Tribology vol. 131, 2009). These simulations predict Weibull slopes and L 10 lives that are in good agreement with the previous theoretical and experimental results. It is seen that as inclusions become larger or shallower, they cause a larger decrease in the fatigue lives and their scatter. Also, introduction of more inclusions to the material significantly reduces the fatigue lives and their Weibull slopes.