Using molecular dynamics (MD) we study the dependency of the contact mechanics on the sliding speed when an elastically soft slab (block) is sliding on a rigid substrate with a $\sin \left(q_{0}x\right)$ surface height profile. The atoms on the block interact with the substrate atoms by Lennard-Jones potentials. We consider contacts with and without adhesion. The contact area and the friction force are nearly velocity independent for small velocities (v < 0.25 m/s) in spite of the fact that the shear stress in the contact area is rather non-uniform. For the case of no adhesion the friction coefficient is very small. For the case of adhesion the friction coefficient is higher, and is mainly due to energy dissipation at the opening crack tip, where rapid atomic snap-off events occur during sliding. We comment on the role of elastic non-linearity on the change in the contact area with increasing tangential force.

使用分子动力学（MD），我们研究了当弹性软板（块）在具有刚性的基底上滑动时，接触力学对滑动速度的依赖性。 $罪（q_{0}X）$表面高度轮廓。嵌段上的原子通过Lennard-Jones电势与底物原子相互作用。我们考虑有和没有粘附的接触。 尽管在接触区域中的剪切应力相当不均匀，但对于小速度（v <0.25 m / s），接触区域和摩擦力几乎与速度无关。对于没有粘附力的情况，摩擦系数非常小。对于粘附的情况，摩擦系数较高，这主要是由于开裂裂纹尖端处的能量耗散而引起的，在此过程中，在滑动过程中会发生快速的原子折断事件。我们评论了随着切线力的增加，弹性非线性在接触面积变化中的作用。