论文标题
橡胶粘附和摩擦：表面能量和污染膜的作用
Rubber adhesion and friction: role of surface energy and contamination films
论文作者
论文摘要
我们研究表面能和污染膜对橡胶粘附和滑动摩擦的影响。我们发现，分子从橡胶转移到底物，从而降低了粘附的工作，并使橡胶摩擦对底物表面能不敏感。我们表明，粘附和摩擦之间没有简单的关系：粘附是由于（垂直）脱离过程在接触区域的边缘（开放裂纹传播）（开放裂纹繁殖），而在许多情况下，摩擦主要由纳米化区域的（切向）粘性区域的（切向切向）粘性区域确定。因此，尽管流体中的拉力可能会大大减少（由于粘附的工作减少），但由于实际接触区域可能干燥，滑动摩擦可能只会略有影响，并且接触区域中的摩擦剪切应力几乎不受流体影响。
We study the influence of the surface energy and contamination films on rubber adhesion and sliding friction. We find that there is a transfer of molecules from the rubber to the substrate which reduces the work of adhesion and makes the rubber friction insensitive to the substrate surface energy. We show that there is no simple relation between adhesion and friction: adhesion is due to (vertical) detachment processes at the edge of the contact regions (opening crack propagation), while friction in many cases is determined mainly by (tangential) stick-slip instabilities of nanosized regions, within the whole sliding contact. Thus while the pull-off force in fluids may be strongly reduced (due to a reduction of the work of adhesion), the sliding friction may be only slightly affected as the area of real contact may be dry, and the frictional shear stress in the contact area nearly unaffected by the fluid.
