In this paper, a collision friction model for a double-layer MoS₂ film is proposed considering the microgravity induced collision in space environment. A modified REBO (Reactive Empirical Bond Order) potential is used to describe interactions among the atoms in the MoS₂ film. The collision friction process of the MoS₂ film is simulated by vibrations in the y and z directions, and the dependence of average friction force is analyzed. The influence of a single vibration in the y direction on the friction forces can be ignored, while the vibration in the z direction shows great influence. The effects of vibration frequency and amplitude on frictional behaviors of the MoS₂ film are investigated. The average friction forces during the collision friction process correlate with the frequency of the vibration in the z direction, and the relationship shows four stages. As the frequency increases, average friction forces show low values in the first stage, and they are increased as the frequency in the second stage. In the third stage, the average friction forces are decreased, and they come to a stable level in the fourth stage. Increasing the vibration amplitude at different frequencies leads to an increase in average friction force, due to that the increased amplitude results in a high indentation depth. The puckering phenomenon occurs at a specific frequency, which is a reason that the average friction force is increased during this collision friction process.

在本文中，考虑到微重力引起的空间环境碰撞，提出了双层MoS ₂薄膜的碰撞摩擦模型。修改后的 REBO（反应性经验键序）势用于描述 MoS ₂膜中原子之间的相互作用。通过y和z方向的振动模拟了MoS ₂薄膜的碰撞摩擦过程，分析了平均摩擦力的依赖性。y方向的单次振动对摩擦力的影响可以忽略不计，而z方向的振动对摩擦力的影响可以忽略不计方向影响很大。研究了振动频率和振幅对 MoS ₂薄膜摩擦行为的影响。碰撞摩擦过程中的平均摩擦力与z 轴的振动频率相关方向，关系呈现四个阶段。随着频率的增加，平均摩擦力在第一阶段显示出较低的值，并且随着频率的增加而在第二阶段增加。第三阶段，平均摩擦力下降，第四阶段趋于稳定。增加不同频率下的振动幅度会导致平均摩擦力增加，因为增加的幅度会导致高压痕深度。褶皱现象以特定频率发生，这就是在此碰撞摩擦过程中平均摩擦力增加的原因。