微尺度摩擦行为广泛存在于各种重要工业器件与系统中，随着各类机电系统高集成化和微小型化的发展，摩擦对器件的影响越发不可忽视。在微尺度下，摩擦行为表现出对界面性质与接触尺寸的强依赖性，认识微尺度下静动摩擦转变对控制摩擦、减小能耗具有重要的意义。

在介绍了微尺度摩擦研究背景和分子动力学模拟方法后，本文详细讨论了界面物性对微观摩擦的影响：描述了块体静动转变的各种特征，观察到不同界面物性时静摩擦系数的非线性变化现象。通过单独分析界面粘性与界面刚度对摩擦的贡献，阐明了二者间的竞争机制，解释了静摩擦系数的非线性变化现象。

随后本文讨论了微尺度摩擦的尺寸效应，观察到临界静摩擦力随接触尺寸增加而饱和的现象，并通过接触层云图揭示了饱和现象的机理。

总的来说，本文使用分子动力学方法完整模拟了微尺度原子级光滑界面的摩擦过程，分别讨论了界面物性与接触尺寸对摩擦行为的影响。研究结论不局限于单一材料，对理解微观摩擦行为提供了可行思路与方法。

Microscale friction behavior is widely present in various important industrial devices and systems. With the development of high integration and miniaturization of various electromechanical systems, the impact of friction on devices cannot be ignored. At the microscale, friction behavior exhibits a strong dependence on interface properties and contact size. Understanding the transition from static to dynamic friction at the microscale is of great significance for controlling friction and reducing energy consumption.

After introducing the background of micro scale friction research and molecular dynamics simulation methods, this article discusses in detail the influence of interface properties on micro friction: describes various characteristics of block static dynamic transformation, and observes the nonlinear change phenomenon of static friction coefficient under different interface properties. By separately analyzing the contributions of interface viscosity and interface stiffness to friction, the competition mechanism between the two was elucidated, and the nonlinear variation phenomenon of static friction coefficient was explained.

Subsequently, this article discusses the size effect of microscale friction and observes the phenomenon of critical static friction saturation with increasing contact size. The mechanism of saturation phenomenon is revealed through the contact layer cloud map.

Overall, this article uses molecular dynamics methods to fully simulate the friction process of microscale atomic level smooth interfaces, and discusses the effects of interface properties and contact size on friction behavior. The research conclusion is not limited to a single material and provides feasible ideas and methods for understanding micro friction behavior.