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 ##IMG## [http://ej.iop.org/images/0295-5075/131/2/24006/epl20228ieqn1.gif] {$\text{sin} (q_0 x)$} 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 f...

中文翻译：

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晶格俘获在滑动摩擦中的作用

使用分子动力学，我们研究了弹性板（块）在具有## IMG ## [http://ej.iop.org/images/0295-]的刚性基板上滑动时摩擦力对滑动速度的依赖性。 5075/131/2/24006 / epl20228ieqn1.gif] {$ \ text {sin}（q_0 x）$}表面高度轮廓。由于在闭合和打开裂纹尖端处的声子发射，摩擦力几乎与速度无关，在滑动过程中会发生快速的原子咬入和脱出事件。快速事件是由晶格俘获引起的，并且与在固体中裂纹扩展的模型研究中观察到的速度间隙和滞后效应密切相关。这表明摩擦力受在接触区域边缘处发生的过程支配，这通过计算得到证实，该计算表明摩擦力与法向力无关。