Influence of anisotropic surface roughness on lubricated rubber friction: Extended theory and an application to hydraulic seals
Influence of anisotropic surface roughness on lubricated rubber friction: Extended theory and an application to hydraulic seals
复制标题
DOI：
10.1016/j.wear.2018.02.023
复制
发表时间：
2018-09-15
期刊：
影响因子：
5
通讯作者：
Persson, B. N. J.
中科院分区：
文献类型：
--
作者：
Scaraggi, M.;Angerhausen, J.;Persson, B. N. J.
机器元件和机械部件的表面通常具有各向异性的粗糙度，这可能是由于加工过程，例如磨削或磨损造成的。因此，了解表面粗糙度各向异性如何影响接触力学性能（如摩擦和界面分离）非常重要，这对润滑接触非常重要。在这里，我们将多尺度平均场模型扩展到软（如橡胶）弹性固体和刚性反表面之间的润滑接触。我们考虑具有各向异性表面粗糙度的表面，并讨论流体流动因子和摩擦因子如何依赖于粗糙度功率谱密度，以及粗糙度在相互作用固体上的位置。最后，我们对丁腈橡胶o形环与不同表面粗糙度的各向同性和各向异性钢表面之间的润滑滑动接触进行了实验研究。实验结果与理论预测结果进行了较好的定量比较，表明该理论准确地反映了多尺度润滑机理。
Machine elements and mechanical components have often surfaces with anisotropic roughness, which may result from the machining processes, e.g. grinding, or from wear. Hence, it is important to understand how surface roughness anisotropy affects the contact mechanics properties, such as friction and the interface separation, which is important for lubricated contacts. Here we extend a multiscale mean-field model to the lubricated contact between a soft (e.g. rubber) elastic solid and a rigid countersurface. We consider surfaces with anisotropic surface roughness, and discuss how the fluid flow factors and friction factors depend on the roughness power spectral density, as well as on the location of roughness on the interacting solids. Finally, we present an experimental study of the lubricated sliding contact between a nitrile butadiene rubber O-ring and steel surfaces with different kinds of isotropic and anisotropic surface roughness. The good quantitative comparison between the experimental results and the theory predictions suggests that the multiscale lubrication mechanisms are accurately captured by the theory.