论文标题
通过大量松弛测量来预测摩擦老化
Predicting frictional ageing from bulk relaxation measurements
论文作者
论文摘要
固体之间的静态摩擦系数通常取决于它们在测量之前保持静态接触的时间。这种摩擦衰老是静态和动态摩擦系数之间差异的起源，但仍然难以理解。通常，随着界面在压力下变化，原子接触区域的较慢增加。但是，这很难量化，因为表面在所有长度尺度上都具有粗糙度，并且摩擦并不总是与接触区域成正比。在这里，我们表明在聚合物摩擦摩擦界面内表面不规则的塑性流具有与大量相同的弛豫动力学，从而可以预测摩擦衰老的速率。
The coefficient of static friction between solids generally depends on the time they have remained in static contact before the measurement. Such frictional aging is at the origin of the difference between static and dynamic friction coefficients, but has remained difficult to understand. It is usually attributed to a slow increase in the area of atomic contact as the interface changes under pressure. This is however very difficult to quantify as surfaces have roughness at all length scales, and friction is not always proportional to the contact area. Here, we show that plastic flow of surface irregularities within a polymer-on-glass frictional interface exhibits identical relaxation dynamics as that of the bulk, allowing to predict the rate of frictional aging.
