受限颗粒体引发混合摩擦非线性的研究现状与展望

The Present State and Outlook of Studies of Frictional Nonlinearity Induced by Confined Particles in Mix-friction

机械摩擦界面中多多少少存在一些受限颗粒体,这些受限颗粒体和复杂的微凸体接触,并与局部液体润滑膜共同形成了具有明显非线性的混合摩擦状态。受限颗粒体在机械副中的行为往往处于介观尺度,并且形式多样、机理复杂。首先阐述了摩擦非线性在机械摩擦副中的体现以及受限颗粒体在此问题中的机理,并概括了受限颗粒体在不同界面条件下可能起到的减摩、增摩、诱发噪声或摩擦力不稳定性等作用。针对混合摩擦状态下的受限颗粒体引发的摩擦非线性问题,对不同应用背景的含受限颗粒体的摩擦界面的实验研究,包括颗粒Couette流剪切实验、粉末层SEM观察实验、外来颗粒以及磨损颗粒实验,进行了归纳,并对摩擦界面内受限颗粒体实验研究的空白和难点进行了总结。针对受限颗粒体在摩擦界面中的行为的建模研究,包括FEM、DEM以及动力学建模,分析了各种建模方法的优劣,并提出了未来建模工作的趋势。最后,对受限颗粒体诱发的机械副的黏滑和爬行现象的机理进行了分析,并阐述了其研究意义。

There are more or less confined particles in mechanical frictional interface. These particles, asperities contact, and local fluid lubricant constitute the mix-friction state with obvious frictional nonlinearity together. This paper first illustrates the embodiment of frictional non-linearity in mechanical frictional pairs and the mechanism of confined particles in this problem, and the different effects of confined particles in mechanical pairs including reducing friction, increasing friction, inducing noise, and the inducing of the instability of friction force are briefed. Focusing on the frictional instability induced by the confined particles in mixed-friction, this paper concludes different experimental studies of the frictional interface with confined particles under different application backgrounds including the particular couette flow experiment, the SEM observation of powder layer, the experiment research about intruding particles and wear particles, then, the blank and difficulty of the experimental research about the confined particles in mechanical frictional pairs are summarized. The advantages and disadvantages of different modeling methods are analyzed and the trend about the modeling research of the behavior of confined particles in frictional interface of future modeling job are proposed. Finally, the mechanisms of stick-slip and creep phenomena induced by confined particles are analyzed, and the research significance is illustrated.