论文标题
滑移期间的球体和气缸接触力学
Sphere and cylinder contact mechanics during slip
论文作者
论文摘要
使用分子动力学（MD），我们研究接触力学对滑动速度的依赖性当弹性柔软的平板（块）在具有$ {\ rm sin}（q_0 x）$表面高度轮廓的刚性基板上滑动。 Lennard-Jones电位与底物原子相互作用。我们考虑具有和没有粘附的接触。我们发现，尽管接触区域中的剪切应力相当均匀，但接触面积和摩擦力几乎是小速度（$ V <0.25 \ {\ rm m/s} $）几乎独立的速度。对于没有粘附的情况，摩擦系数非常小。对于粘附的情况，摩擦系数更高，主要是由于开口裂纹尖端处的能量耗散，在滑动过程中发生了快速的原子捕捉事件。进行了人手指和干净的玻璃板之间的粘附实验，对于干手指，没有发生宏观粘附。我们建议，观察到的接触区域下降，剪切力增加是由于非粘性指的玻璃接触力学导致的，涉及复杂分层材料的大变形。
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 ${\rm sin} (q_0 x)$ surface height profile. The atoms on the block interact with the substrate atoms by Lennard-Jones potentials. We consider contacts with and without adhesion. We found that the contact area and the friction force are nearly velocity independent for small velocities ($v < 0.25 \ {\rm m/s}$) 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. Adhesion experiments between a human finger and a clean glass plate were carried out, and for a dry finger no macroscopic adhesion occurred. We suggest that the observed decrease in the contact area with increasing shear force results from non-adhesive finger-glass contact mechanics, involving large deformations of a complex layered material.
