论文标题
关于滑动摩擦的起源：晶格诱捕的作用
On the origin of sliding friction: Role of lattice trapping
论文作者
论文摘要
使用分子动力学，当弹性平板（块）在具有$ {\ rm sin}（q_0 x）$表面高度曲线的刚性基板上滑动时，我们研究摩擦力对滑动速度的依赖性。摩擦力几乎是由于在闭合和开口裂纹尖端处发射的声子发射而几乎独立的，在滑动过程中发生了快速的原子扣和 - out事件。快速事件是由晶格捕获引起的，与速度间隙密切相关，并且在固体中裂纹传播的模型研究中观察到的磁滞效应。这表明摩擦力由发生在接触区域边缘的过程主导，这通过计算证实，表明摩擦力与正常力无关。如裂纹理论所预期的那样，当滑动速度接近实心横向声速度时，摩擦力会大大增加。
Using molecular dynamics we study the dependence of the friction force on the sliding speed when an elastic slab (block) is sliding on a rigid substrate with a ${\rm sin} (q_0 x)$ surface height profile. The friction force is nearly velocity independent due to phonon emission at the closing and opening crack tips, where rapid atomic snap-in and -out events occur during sliding. The rapid events result from lattice trapping and are closely related to the velocity gap and hysteresis effects observed in model studies of crack propagation in solids. This indicates that the friction force is dominated by processes occurring at the edges of the contact area, which is confirmed by calculations showing that the friction force is independent of the normal force. The friction force increases drastically when the sliding velocity approaches the solid transverse sound velocity, as expected from the theory of cracks.
