| 基于临界曲面的改进Paris定律球轴承疲劳寿命预测方法 |
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| 引用本文： | 徐东,徐永成,陈循,李兴林,杨拥民.基于临界曲面的改进Paris定律球轴承疲劳寿命预测方法[J].机械工程学报,2011,47(2). |
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| 作者姓名： | 徐东 徐永成 陈循 李兴林 杨拥民 |
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| 作者单位： | 1. 国防科技大学机电工程与自动化学院,长沙,410073
2. 杭州轴承试验研究中心有限公司,杭州,310022 |
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| 基金项目： | 国家自然科学基金(50705096); 高档数控机床与基础制造装备科技重大专项(2009zx04014-014)资助项目 |
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| 摘 要： | 通过场发射扫描电镜对球轴承疲劳故障点微观结构进行观察,发现裂纹总是沿着某个曲面进行萌生和扩展,扩展到一定程度后发生断裂形成近似椭圆形状的剥落点,随着球轴承的运转,不仅断裂后的裂纹发生二次剥落,而且剥落点将在新的曲面上发生多次剥落,形成断层形貌。基于此种现象,提出球轴承临界曲面的概念,假定裂纹的萌生和扩展均在此临界曲面上,将三维裂纹扩展问题转化为二维裂纹扩展问题进行分析。在临界曲面概念的基础上,提出改进的Paris疲劳寿命预测模型,将疲劳寿命分为裂纹扩展和剥落点增大两部分,分段采用改进的Paris定律预测球轴承的疲劳寿命。通过多套SKF 6205深沟球轴承疲劳寿命试验数据进行验证,与传统的SKF L-P公式预测结果相比,提出的方法能够较好地预测球轴承的疲劳寿命。
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| 关 键 词： | 临界曲面 Paris 定律 疲劳寿命预测 预测模型 球轴承 |
Fatigue Life Prediction of Ball Bearings by Modified Paris Law Based on Critical Curved Surface |
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| XU Dong,XUYongcheng,CHEN Xun,LI Xinglin,YANG Yongmin.Fatigue Life Prediction of Ball Bearings by Modified Paris Law Based on Critical Curved Surface[J].Chinese Journal of Mechanical Engineering,2011,47(2). |
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| Authors: | XU Dong XUYongcheng CHEN Xun LI Xinglin YANG Yongmin |
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| Affiliation: | XU Dong1 XU Yongcheng1 CHEN Xun1 LI Xinglin2 YANG Yongmin1(1.College of Mechatronical Engineering and Automation,National University of Defense Technology,Changsha 410073,2.Hangzhou Bearing Test & Research Center(HBRC),Hangzhou 310022) |
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| Abstract: | Microstructures of flaws of ball bearings are investigated by using field emission scanning electron microscope and it is found that both crack initiation and crack propagation are always along a certain curved surface.Propagating to a certain degree,the crack will fracture and form an elliptic flaw.Along with the ball bearing operating,not only the flaw continues to flake away,but also some new cracks initiate and propagate along new curved surfaces and fracture ultimately.There are many cross sections in ... |
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| Keywords: | Critical curved surface Paris law Fatigue life prediction Prediction model Ball bearing |
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