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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 19990914-17; Leeds(GB) >An experimental study of the relationship between surface roughness and stress in EHL contacts
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An experimental study of the relationship between surface roughness and stress in EHL contacts

机译：EHL接触件表面粗糙度与应力关系的实验研究

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Contact pressures, particularly those produced by surface roughness, and the resultant sub-surface stresses, are known to be directly related to failure. Measurement of contact pressure is extremely difficult, measurement of the stress appears impossible. This led the authors to consider an inverse approach to the problem. Instead of generating a profile and trying to determine the resulting stress, it was decided to fix the stress level in the material and to determine the roughness profile that would generate it. Accordingly, a soft steel disc was run against a hard counterface, under increasingly severe load conditions, and the changes in the surface profile observed. Since the yield strength of the soft material is known, the results should provide an indication of the relationship between surface roughness profile and sub-surface stress. The results presented in this paper are from a preliminary investigation using a largely circumferential roughness profile on the soft disc. At each load the roughness was measured and used in a theoretical analysis to estimate the contact pressures and the sub-surface stresses. After allowing for the development of residual stresses, the results show a close correlation between the maximum calculated von Mises' stress and the yield stress of the material over the entire range of loads examined.
机译：已知接触压力，尤其是由表面粗糙度产生的接触压力，以及由此产生的亚表面应力，直接与破坏有关。接触压力的测量非常困难，似乎无法测量应力。这导致作者考虑采用反方法解决该问题。决定生成材料中的应力水平并确定会生成材料的粗糙度轮廓，而不是生成轮廓并尝试确定所产生的应力。因此，在日益严峻的负载条件下，软钢盘碰到了硬质的对面，并观察到了表面轮廓的变化。由于软材料的屈服强度是已知的，因此结果应表明表面粗糙度轮廓与次表面应力之间的关系。本文提供的结果来自使用软盘上大部分圆周粗糙度轮廓进行的初步研究。在每个载荷下，都要测量粗糙度，并将其用于理论分析中，以估算接触压力和次表面应力。在考虑了残余应力之后，结果表明，在所研究的整个载荷范围内，计算出的最大冯·米塞斯应力与材料的屈服应力之间存在密切的相关性。

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