中文摘要：

采用分子动力学方法模拟了半球形刚性压头在单晶铜基体上的纳观黏着滑动接触过程。设计了不同纹理表面，研究了表面纹理方向和纹理密度对滑动摩擦力的影响。模拟结果表明：表面纹理密度小于50％时，0°和90°方向纹理表面的滑动摩擦力振幅较小，且45°方向纹理表面最易发生滑移塑性变形；纹理密度相差较大时，对于0°和90°方向纹理表面，滑动摩擦力随纹理密度的增大而增大；在较小的纹理密度下，0°和90°方向纹理表面的减摩效果优于光滑表面的减摩效果；纳观纹理表面的引入对滑动摩擦力的大小产生影响，但没有改变滑动摩擦力的波动周期。

英文摘要：

The nanoscale friction process of a rigid hemispherical tip sliding on a single crystal cop- per substrate was studied by using molecular dynamics simulations. Different surface textures were designed and used. The effects of the direction and the density of surface textures on the sliding friction were analyzed. Comparisons of the sliding friction with different texture direction show that the amplitude of the sliding friction is lower at 0° and 90° texture direction when the surface texture density is less than 50 %. The phenomenon of slip deformation is discovered when the texture direction is as 45°. For 0°and 90°texture direction,the sliding friction increases with the increase of the surface texture density when the texture density has great difference. Compared with the smooth surface, the textured surface can reduce friction at 0~ and 90° texture direction for lower texture density effectively. Employment of nanoscale surface texture has significant influence on the sliding friction, but it does not change the period of the sliding friction.