边界润滑对滑动面错配角的依赖性
Dependence of boundary lubrication on the misfit angle between the sliding surfaces
摘要：
利用基于Langevin方程的分子动力学，通过阻尼系数随坐标和速度的变化，研究了两种固体之间的“软”润滑剂薄层（润滑剂内部的相互作用弱于润滑剂-基体相互作用）的摩擦特性。在低驱动速度下，系统表现出粘滑运动。润滑剂在滑动过程中可以熔化或不熔化，因此表现出“液体滑动”（LS）或“层覆层滑动”（LoLS）机制。LoLS机制主要在低滑动速度下运行。我们调查的摩擦性能之间的滑动表面的错配角的依赖关系，并计算多晶表面接触的静摩擦阈值的分布。
英文摘要：
Using molecular dynamics based on Langevin equations with a coordinate- and velocity-dependent damping coefficient, we study the frictional properties of a thin layer of "soft" lubricant (where the interaction within the lubricant is weaker than the lubricant-substrate interaction) confined between two solids. At low driving velocities the system demonstrates stick-slip motion. The lubricant may or may not be melted during sliding, thus exhibiting either the "liquid sliding" (LS) or the "layer over layer sliding" (LoLS) regimes. The LoLS regime mainly operates at low sliding velocities. We investigate the dependence of friction properties on the misfit angle between the sliding surfaces and calculate the distribution of static frictional thresholds for a contact of polycrystalline surfaces.
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