双壁碳纳米管轴承移动摩擦特性的理论研究

基于分子动力学方法对双壁碳纳米管轴承的移动摩擦特性进行了理论研究。针对双壁碳纳米管轴承的结构和物理模型,使用经验势函数分析了双壁碳纳米管轴承的管间交互作用势和交互作用力。建立碳纳米管轴承移动动力学模型,采用数值模拟方法,研究不同长度、半径和内外纳米管质心相对位移对纳米管轴承移动阻尼系数的影响,并给出双壁碳纳米管轴承移动阻尼系数与长度、半径和质心相对位移的定量关系。

Study of Translation Friction Properties in Doublewalled Carbon Nanotubes Bearing

We study the translation friction properties of double-walled carbon nanotubes(DWCNT) bearing based on molecular dynamics method.According to the structure and physical model of DWCNT bearing,we analyzed the energy of a single-walled carbon nanotube,and DWCNT′s interaction potential and force between the two tubes by using experience potential function.The translation dynamics model of nanotubes bearing was established.Adopting the numerical simulation method,we studied the influence of different lengths,radiuses and the distances of the centroid on the translation friction of nanotubes bearing.The relationships between the DWCNT bearing′s translation damping coefficient and its length,radius and the distance of the centroid are given.