The Influence of Slide–Roll Ratio on the Extent of Micropitting Damage in Rolling–Sliding Contacts Pertinent to Gear Applications
The Influence of Slide–Roll Ratio on the Extent of Micropitting Damage in Rolling–Sliding Contacts Pertinent to Gear Applications
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滑动-滚动比对与齿轮应用相关的滚动-滑动接触中微点蚀损伤程度的影响
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
A. Kadiric
中科院分区：
文献类型：
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作者：
P. Rycerz;A. Kadiric
微点蚀是在薄油膜、混合润滑条件下运行的滚动-滑动接触中发生的一种表面损伤，例如在啮合齿轮轮齿之间形成的接触。与更广泛研究的点蚀损伤一样，微点蚀是由滚动接触疲劳的一般机制引起的，但与点蚀不同，它是通过在局部粗糙度粗糙的水平上形成微坑来表现出来的。尽管微点蚀日益成为齿轮失效的一种主要形式，但相关的机理却知之甚少，目前还没有确定的设计标准来评估齿轮或其他应用中发生微点蚀的风险。本文提供了对驱动微点蚀损伤发生的摩擦学机制的新认识，并有助于为正在进行的关于接触滑滚比(SRR)对微点蚀影响的适当设计准则的讨论提供参考。利用三盘滚动接触疲劳试验机，对渗碳齿轮钢试件中SRR的大小和方向对微点蚀损伤发展的影响进行了实验研究。测试条件受到严格控制，以隔离感兴趣变量的影响。特别是，消除了不同SRR在整体加热方面的任何差异，以便在所有SRR的相同薄膜厚度下进行测试。结果表明，增加SRR的大小会增加微点蚀损伤的程度，而负SRR(即损伤积累较慢的成分)比等效的正SRR产生更多的微点蚀。弹流动态膜厚度的测量表明，在没有整体加热的情况下，增加SRR并不会导致EHL膜厚度的减少，因此这不是在较高SRR时微点蚀增加的原因。相反，我们表明，增加SRR促进微点蚀的主要机制是通过增加粗糙度在通过滚动-滑动接触过程中经历的微接触应力循环的次数。因此，粗糙度应力历史应该构成任何潜在的防止微点蚀的设计标准的基础。
Micropitting is a type of surface damage that occurs in rolling–sliding contacts operating under thin oil film, mixed lubrication conditions, such as those formed between meshing gear teeth. Like the more widely studied pitting damage, micropitting is caused by the general mechanism of rolling contact fatigue but, in contrast to pitting, it manifests itself through the formation of micropits on the local, roughness asperity level. Despite the fact that micropitting is increasingly becoming a major mode of gear failure, the relevant mechanisms are poorly understood and there are currently no established design criteria to assess the risk of micropitting occurrence in gears or other applications. This paper provides new understanding of the tribological mechanisms that drive the occurrence of micropitting damage and serves to inform the ongoing discussions on suitable design criteria in relation to the influence of contact slide–roll ratio (SRR) on micropitting. A triple-disc rolling contact fatigue rig is used to experimentally study the influence of the magnitude and direction of SRR on the progression of micropitting damage in samples made of case-carburised gear steel. The test conditions are closely controlled to isolate the influence of the variable of interest. In particular, any variation in bulk heating at different SRRs is eliminated so that tests are conducted at the same film thickness for all SRRs. The results show that increasing the magnitude of SRR increases the level of micropitting damage and that negative SRRs (i.e. the component where damage is being accumulated is slower) produce more micropitting than the equivalent positive SRRs. Measurements of elastohydrodynamic film thickness show that in the absence of bulk heating, increasing SRR does not cause a reduction in EHL film thickness and therefore this cannot be the reason for the increased micropitting at higher SRRs. Instead, we show that the main mechanism by which increase in SRR promotes micropitting is by increasing the number of micro-contact stress cycles experienced by roughness asperities during their passage through the rolling–sliding contact. Therefore, the asperity stress history should form the basis of any potential design criterion against micropitting.
斜齿轮微点蚀试验中的微弹流润滑分析及表面疲劳损伤预测
DOI：
10.1115/1.4007693
发表时间：
2013
期刊：
Journal of Tribology
影响因子：
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作者：
Evans H
通讯作者：
Evans H