金属晶体滑动摩擦因数影响因素的微观数值分析

摘要

利用独立振子模型能量耗散机制和金属晶体的体积效应建立由基体（铁晶体）和对偶（铁晶体）组成的光滑接触平面干摩擦模型，以分子动力学模拟为研究方法，采用 EAM势（嵌入势）计算摩擦模型的系统势能变化，并根据势能变化与摩擦力的关系模型，得到不同条件下摩擦力的变化情况，根据宏观状态下滑动摩擦因数计算公式，得到对应条件下的摩擦因数。通过分子动力学模拟研究发现，随着法向载荷、滑行速度的增大，环境温度的升高，摩擦因数均减小。%Based on the independent oscillator model energy dissipation mechanism and metal crystal volume effect,the smooth contact plane dry friction model consisting of the base body (iron crystal)and the dual (iron crystal)was estab-lished.The variation of potential energy of the iron crystal system was calculated with the EAMpotential function by mo-lecular dynamics simulation method.According to the relationship between the variation of potential energy and sliding friction,the changes of friction in different conditions were got.According to the macro sliding friction coefficient calcula-tion formula,the friction coefficient in corresponding condition was calculated.The results indicate that friction coefficient is decreased with the increasing of normal load,the increasing of sliding velocity and the rising of ambient temperature.