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Coarse-Grained Molecular Dynamics Simulations of Boundary Lubrication on Nanostructured Metal Surfaces
Tribology Letters ( IF 3.2 ) Pub Date : 2020-03-04 , DOI: 10.1007/s11249-020-1276-2
Jan-Michael Albina , Atsushi Kubo , Yoshinori Shiihara , Yoshitaka Umeno

Coarse-grained molecular dynamics simulations were carried out to investigate the frictional properties of lubricant molecules on nanostructured metal surfaces. The simulation cell consists of a lubricant film enclosed between two metal surfaces. The attractive potential of specific iron atoms on the surface was modified such that the lubricant molecule adsorb preferentially on these atoms. These particular iron atoms were arranged to reproduce a grain boundary surface nanostructure. It is found that below the critical normal stress, the strength of the interaction between Fe and the lubricant molecule has little effect on the friction coefficient. However, the behavior of the lubricant film on the metal surface is sensitive to the interaction strength. Large attraction forces increase the adherence of the lubricant film.

中文翻译:

纳米结构金属表面上边界润滑的粗粒分子动力学模拟

进行了粗粒分子动力学模拟,以研究润滑剂分子在纳米结构金属表面上的摩擦性能。模拟单元由两个金属表面之间的润滑膜组成。修饰了表面上特定铁原子的吸引力,以使润滑剂分子优先吸附在这些原子上。这些特定的铁原子排列成可产生晶界表面纳米结构。发现在临界法向应力以下,Fe与润滑剂分子之间的相互作用强度对摩擦系数影响很小。然而,润滑剂膜在金属表面上的行为对相互作用强度敏感。大的吸引力增加了润滑膜的附着力。
更新日期:2020-03-04
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