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采用非平衡分子动力学模拟方法,研究了纳米尺度下十六烷润滑薄膜的分层现象和速度滑移现象,重点考察了剪切速度对速度滑移现象的影响规律,并对其中的微观机理作出了解释.研究结果表明:在铁壁面的限制情况下润滑薄膜出现了分层现象,当润滑薄膜厚度超过50?时,其中间区域呈现出体相均质流体的特征.润滑薄膜层间滑移和界面滑移的临界剪切速度分别为5.5和7.5?/ps,随着剪切速度增加,界面滑移程度增强,而层间滑移程度减弱.润滑薄膜第1和2层十六烷分子层间桥接分子数目决定层间滑移程度,随着剪切速度增加,桥接分子数目也相应增多,层间滑移程度随之减弱.
The non-equilibrium molecular dynamics simulation method was used to study the delamination phenomenon and velocity slip phenomenon of hexadecane lubricating film under nanometer scale. The influence of shear velocity on velocity slip phenomenon was mainly investigated. The microscopic mechanism The results show that the lubricating film delamination occurs when the iron wall is limited, and when the thickness of the lubricating film exceeds 50 μm, the intermediate region exhibits the characteristics of bulk fluid.Lip-slip The critical shear rates of migration and interfacial slippage are 5.5 and 7.5 μ / ps, respectively, with the increase of shear rate, the interfacial slip increases and the interlaminar slippage decreases. The first and second layers of hexadecane The number of bridge molecules between molecules determines the degree of interlayer slip, and as the shear rate increases, the number of bridging molecules also increases accordingly, and the degree of interlayer slip decreases.