Possible impacts of third body nanostructure on friction performance during dry sliding determined by computer simulation based on the method of movable cellular automata
Possible impacts of third body nanostructure on friction performance during dry sliding determined by computer simulation based on the method of movable cellular automata
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DOI：
10.1016/j.triboint.2011.11.018
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发表时间：
2012-04
影响因子：
6.2
通讯作者：
W. Österle;A. Dmitriev;H. Kloss
中科院分区：
文献类型：
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作者：
W. Österle;A. Dmitriev;H. Kloss
在干滑动过程中形成的纳米结构表面膜的摩擦学特性，例如在汽车制动过程中，是通过使用可移动元胞自动机的方法建模来确定的。从磁铁矿中含有13%石墨包裹体的基本模型结构出发，系统研究了不同尺寸和体积分数的软、硬颗粒的附加影响。结果表明，软颗粒团块分解并最终以与单个纳米颗粒相同的方式与氧化物混合。另一方面，硬颗粒的团块与其他成分混合而不分解。增加第三体中软性成分的含量会降低摩擦系数，而增加硬颗粒的含量则会降低摩擦系数。定义了在连续时间步长上摩擦力波动较小的光滑滑动条件的边界条件。除了纳米结构的特征外，施加的法向压力也影响了建模结果。在光滑滑动特性参数范围内，压力增大导致颗粒界面层变厚，摩擦系数略有降低。改变软颗粒或硬颗粒的数量不会改变这种压力依赖关系，而只会改变摩擦水平。
The tribological properties of nanostructured surface films formed during dry sliding, for example during automotive braking, were determined by modelling using the method of movable cellular automata. Starting from a basic model structure, consisting of magnetite with 13% graphite inclusions, the impact of additional soft and hard particles of different size and volume fraction was studied systematically. It was revealed that agglomerates of soft particles decomposed and finally mixed with the oxide in the same way as single nanoparticles. On the other hand, agglomerates of hard particles mixed with the other components without decomposing. Whereas increasing the amount of soft components in the third body lowered the coefficient of friction, the opposite occurred with the hard particles. The boundary conditions for obtaining smooth sliding conditions with minor fluctuations between friction forces at successive time steps could be defined. In addition to features of the nanostructure, the applied normal pressure impacted modelling results. Within the parameter range of smooth sliding behaviour, increasing pressure induced thicker granular interface layers, which lead to a slight decrease of the coefficient of friction. Changing the amount of soft or hard particles did not change this pressure dependency but only the friction level.