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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 19970904-06; London(GB) >'Bi-Gaussian' representation of worn surface topography in elastic contact problems
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'Bi-Gaussian' representation of worn surface topography in elastic contact problems

机译：弹性接触问题中磨损表面形貌的“双高斯”表示

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摘要

Machine elements such as seals, piston rings and bearings commonly operate in the mixed friction regime. Here, lubrication leakage and friction depend on surface roughness. Previous authors have described how "two process" preparations such as grinding followed by honing, result in a beneficial surface texture characterised by plateau regions interspersed by deeper pockets and channels. (For reasons explained in this paper, such surfaces are herein described as "bi-Gaussian".) However, in applications such as mechanical seals, a very similar surface topography is exhibited after wear, sometimes in excess of 1mm. This means that the texture must be self-replicating and not simply the result of "wearing-in" by truncation of larger-scale roughness asperities left by the preparation process. This suggests that a combination of the wear process and the material microstructure is responsible for the worn surface texture. Thus a given microstructure would result in a particular self-replicating "bi-Gaussian" surface texture. Characterising such surfaces with simple parameters and understanding how they behave in sliding contact, makes it possible to optimise the texture for given operating conditions. It is then possible, in principle, to specify a microstructure to produce the in-service surface texture for optimum functional performance in a given duty. This paper presents the mathematical description of the "bi-Gaussian" surface and considers its elastic contact with a smooth plain counterface in terms of plateau-top asperity characteristics obtained using low-cost profilometry equipment. The validity of an elastic contact model is discussed. Finally an outline of the application of the contact model to a particular case of mixed friction sliding is outlined, to illustrate the potential for surface texture optimisation.
机译：密封件，活塞环和轴承等机械元件通常在混合摩擦状态下运行。在此，润滑泄漏和摩擦取决于表面粗糙度。先前的作者已经描述了“两个过程”的准备工作，例如磨削和珩磨如何导致有益的表面纹理，其特征是高原区域散布着更深的凹坑和沟槽。 （出于本文解释的原因，此类表面在本文中称为“双高斯”。）但是，在诸如机械密封的应用中，磨损后表现出非常相似的表面形貌，有时超过1mm。这意味着纹理必须是自我复制的，而不是简单地由于缩短制备过程中留下的较大粗糙度粗糙而导致的“磨合”结果。这表明磨损过程和材料微观结构的结合是造成磨损表面纹理的原因。因此，给定的微观结构将导致特定的自我复制的“双高斯”表面纹理。通过简单的参数表征这些表面并了解它们在滑动接触中的行为，就可以针对给定的操作条件优化纹理。然后，原则上可以指定一种微观结构，以产生在使用中的表面纹理，从而在给定的工作条件下获得最佳的功能性能。本文介绍了“双高斯”表面的数学描述，并考虑了使用低成本轮廓分析仪获得的高原顶凹凸特性，它与光滑的平整反面的弹性接触。讨论了弹性接触模型的有效性。最后，概述了将接触模型应用于混合摩擦滑动的特定情况的概述，以说明优化表面纹理的潜力。

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