The paper presents experimental analysis of relation between friction coefficient and contact pressure of \(\hbox {MoS}_2\) film deposited on \(\hbox {Ti}_6\hbox {Al}_4\hbox {V}\) substrate in contact with sapphire ball during reciprocating sliding motion. It is shown that the value of friction coefficient decreases with increasing contact pressure. A microscale modeling approach is next developed to mimic the experimental observations. Representative volume element is defined based on the actual topography of outer surface of \(\hbox {MoS}_2\) film. Assuming thermo-elastic material properties, the calculations on the asperity level are performed in two steps. Firstly, the mechanical contact between two surfaces is calculated. As a result, the relation between the global load and micro-stress distribution is obtained. Secondly, for a given stress load, thermal analysis is performed providing temperature fluctuation within simplified conical asperity. By assuming relation between friction coefficient and temperature on the microscale, it is possible to obtain macroscopic friction coefficient as a function of contact pressure. In the end, model results are compared with experimental data. The novel aspects of presented approach lie in the selection of three main factors on a micro-level defining macroscopic friction. They are actual surface topography, microscopic temperature and microscopic friction-temperature relation.

本文提出了沉积在\（\ hbox {Ti} _6 \ hbox {Al} _4 \ hbox {V} \）衬底上的\（\ hbox {MoS} _2 \）薄膜的摩擦系数与接触压力关系的实验分析。在往复滑动过程中与蓝宝石球接触。结果表明，摩擦系数的值随着接触压力的增加而减小。接下来，将开发一种微尺度建模方法来模仿实验观察结果。代表性的体积元素是基于\（\ hbox {MoS} _2 \）外表面的实际形貌定义的电影。假设材料具有热弹性，则分两步进行粗糙度的计算。首先，计算两个表面之间的机械接触。结果，获得了总载荷与微应力分布之间的关系。其次，对于给定的应力负载，进行热分析，以提供在简化的圆锥形凹凸内的温度波动。通过在微观尺度上假设摩擦系数和温度之间的关系，可以获得作为接触压力的函数的宏观摩擦系数。最后，将模型结果与实验数据进行比较。提出的方法的新颖方面在于在定义宏观摩擦的微观层面上选择三个主要因素。它们是实际的表面形貌，