基于热力耦合的摩擦系数计算模型与仿真研究

基于界面摩擦过程中摩擦功耗散为界面原子热振动的原理，通过对界面原子在界面势能场激励作用下热振动分析，建立了基于摩擦界面热力耦合过程的滑动摩擦系数计算模型。仿真分析表明：滑动摩擦系数随摩擦速度增加而增高；当摩擦界面实际接触面积与载荷成线性关系时，摩擦系数与接触面积无关，当实际接触面积接近名义接触面积时，摩擦系数随载荷的增加而降低；此外，滑动摩擦系数随晶格常数增大而降低，随原子质量减小而升高。

Research on friction coefficient calculating model based on thermal dynamics coupling on contact surface

Based on the thermal dynamics coupling mechanics, a sliding friction coefficient calculating model is established with analyzing the forced vibrating of atom on contact surface. The simulation analysis indicated that the sliding friction coefficient rises with increasing of rubbing velocity, and has nothing to do with the actual contacted area when the actual contacted area varies linearly with load, but when actual contacted area closes to the name contacted area, the sliding friction coefficient reduces with increasing of load. In addition, the sliding friction coefficient reduces with increasing of crystal constant, and rises with decreasing of atomic mass.