摩擦速度对橡胶摩擦性能影响的微观模拟

Microscopic Simulation of Impacts on Rubber Friction Properties from Friction Velocities

使用分子动力学方法考察金刚石探头在天然橡胶表面的摩擦行为,探索橡胶材料微观摩擦机理。分别模拟温度为100 K和300 K时,不同探头滑动速度下摩擦力和接触区域温度随着摩擦时间的变化。研究表明:1)探头滑动速度越大,橡胶受到的摩擦力越大;随着摩擦过程的推移,摩擦力总体呈现变小的趋势;探头滑动速度越小,摩擦过程越先趋于稳定。2)橡胶接触区域温度随着摩擦过程的推移而先增加后减小;摩擦过程的初始温度略高于环境温度;探头滑动速度越小,接触区域温度下降幅度越明显。

The friction behavior of diamond probe on the surface of natural rubber(NR)is investigated using molecular dynamics method to explore the microscopic friction mechanism of rubber material.Under the temperature of 100 K and 300 K,respectively,the friction forces and the contact zone temperatures varying with the friction time at different probe sliding velocities are simulated.The results show that:(1)The greater the probe sliding velocity,the greater the friction force to the rubber.As the friction process goes on,the friction force tends to be smaller.The smaller the probe sliding velocity,the more stable the friction process is.(2)The temperature of the rubber contact zone first increases and then decreases as the friction process goes on.The initial temperature of the friction process is slightly higher than that of the environmental temperature.The smaller the probe sliding velocity,the more obvious the temperature drop in the contact zone is.