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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 20000905-08; Lyon(FR) >Experimental investigation of surface initiated rolling contact fatigue using dented surfaces
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Experimental investigation of surface initiated rolling contact fatigue using dented surfaces

机译：凹陷表面引发的滚动接触疲劳的实验研究

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摘要

Generally, rolling bearing fatigue is divided into subsurface and surface initiated types. Subsurface fatigue has long been considered as the major damaging mechanism in lubricated contact submitted to cyclic loading. The improvement in steel processing during the last 20 years resulted in high steel cleanliness and as a consequence in a large reduction of subsurface inclusion initiated damage. Nowadays one of the main causes of damage (the other one corresponding to starvation) is surface initiated failure due to lubricant contamination. In fact, hard particles present in lubricants with various origins (coming from either external or internal sources) can not be completely eliminated in most commercial applications. Passing through the contact, they produce dents on the raceways, which generate stress concentrations, leading to fatigue life reduction. This paper describes the experimental procedures developed at SNR Roulements to investigate the impact of dents on bearing performance and to study the damage mechanisms. The evaluation was conducted using 2 types of pre-damaging processes to simulate contaminant defects prior to fatigue test under clean lubrication: 1. dent printing on the raceway of flat washers using a Rockwell hardness indenter, 2. performing well-controlled and repeatable level of natural dents on the raceways of bearings using a specific equipment to damage bearing surface. Three-dimensional surface topography was used to characterise dent morphology and to compare the influence of materials and heat treatments. The results show that the pre - denting method on roller bearings is efficient to reproduce surface morphology and damage encountered on the components of equipment under practical operating conditions but in a shorter time interval. They also reveal significant differences in the performance of various bearing products and materials. It demonstrates the ability of this process to quantify the damaging effect of contaminants on bearing life.
机译：通常，滚动轴承疲劳分为表面下引发型和表面下引发型。长期以来，地下疲劳一直被认为是承受循环载荷的润滑接触的主要破坏机理。在过去的20年中，钢加工的改进导致钢的清洁度提高，并因此大大减少了地下夹杂物引发的破坏。如今，造成损坏的主要原因之一（另一种与饥饿相关的原因）是由于润滑剂污染导致的表面引发故障。实际上，在大多数商业应用中不能完全消除各种来源（来自外部或内部来源）的润滑剂中存在的硬颗粒。通过接触，它们在滚道上产生凹痕，从而产生应力集中，从而导致疲劳寿命降低。本文介绍了SNR Roulements开发的实验程序，以研究凹痕对轴承性能的影响并研究损伤机理。评估是使用两种类型的预损伤过程进行的，以在清洁润滑条件下进行疲劳测试之前模拟污染物缺陷：1.使用洛氏硬度计在平垫圈的滚道上进行凹痕印刷； 2.进行可控且可重复的水平使用专用设备损坏轴承滚道上的自然凹痕，以损坏轴承表面。使用三维表面形貌来表征凹痕的形态，并比较材料和热处理的影响。结果表明，在实际操作条件下，但在较短的时间间隔内，滚动轴承上的预压痕方法可以有效地再现表面形态和设备部件上遇到的损坏。它们还揭示了各种轴承产品和材料在性能上的显着差异。它证明了此过程能够量化污染物对轴承寿命的破坏作用。

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