考虑温度影响的干摩擦接触分子动力学研究

The prediction of friction factors based on multi-scale methods has become a research hotspot. The influence of temperature is the main issue for mechanical systems that operate at high temperatures, such as aeroengines. In this paper, we propose a novel method for predicting friction factors based on molecular modeling and the contact force under the influence of different temperatures. Considering that the increase in temperature enhances the adhesion of the micro convex body, a real area calculation method different from Hertz contact theory is proposed. The correctness of the proposed method is verified by comparing it with the experiment. The results show that the increase in temperature leads to the enhancement of adhesion of the micro convex body at the rough face. Real contact area is bigger than what the Hz contact theory predicts when adhesion is high due to the substantial plastic deformation of the micro convex body. On the other hand, it also leads to the attenuation of the mechanical properties of materials. With the increase in temperature, the tangential and normal contact forces decrease. Based on the multiscale method, we provide a feasible research scheme for the prediction of friction factors of a high-temperature machine.