摩擦界面原子受迫振动温升模型及计算研究

Study on the Model of Atomic Temperature Rising under the Forced Vibration

通过对界面摩擦过程中原子在接触势能场作用下受迫振动微观机制的分析,基于受迫振动能量全部转化为系统热能的观点,针对独立振子模型建立了摩擦界面原子的温升模型.结果表明:当晶格常数及原子质量较小时,界面原子受迫振动后的温升随晶格常数及原子质量的增大而减小;当晶格常数及原子质量较大时,晶格常数及原子质量的变化对原子受迫振动温升影响不显著;当受迫振动频率低于原子固有频率时,原子受迫振动温升随相对滑动速度的增大而增加;当受迫振动频率接近原子固有频率时,温升加剧;当受迫振动频率高于原子固有频率时,原子受迫振动温升随相对滑动速度的增加而降低.

With analyzing the mechanism of forced vibration of the interface atoms, based on the independent oscillator model, a temperature rising model of atoms was established. The results indicate that temperature rising of atom increased with decreasing of the atomic mass and the crystal constant. When the forced vibration frequency was lower than the natural frequency of the atom, the temperature rising of atom increases with increasing of the relative sliding velocity. When the forced vibration frequency closed to the natural frequency, the temperature rising will be intensified significantly. When the forced vibration frequency was higher than the natural frequency, the temperature rising of atom reduced with increasing of the relative sliding velocity.