The contact geometry of rough surfaces markedly affects the functional properties such as sealing and lubrication. The effect of surface roughness on the percolation characteristic of elastic contact was studied. The elastic contact of randomly rough surfaces with a glass plate was performed using four different surface roughnesses of silicone rubber blocks as specimens. The results illustrate that the percolation threshold was significantly affected by the valley morphology of a surface. The increase in depth and void volume of valleys improved the connectivity between valleys, but impeded the coalescence of contact clusters, resulting in the extinction of the spanning void cluster allowing fluid flow when the relative contact area was large. Furthermore, the critical pressure and connectivity at the percolation threshold were related to the maximum peak height and autocorrelation length of a surface, respectively.

粗糙表面的接触几何形状会显着影响功能特性，例如密封和润滑。研究了表面粗糙度对弹性接触渗流特性的影响。使用硅橡胶块的四种不同表面粗糙度作为样本，进行随机粗糙表面与玻璃板的弹性接触。结果表明，渗滤阈值受到表面谷形的显着影响。谷的深度和空隙体积的增加改善了谷之间的连通性，但是阻碍了接触团簇的聚结，导致跨越的空隙团簇的灭绝，当相对接触面积较大时允许流体流动。此外，