Modelling the Sliding Behaviour of Tribofilms Forming During Automotive Braking: Impact of Loading Parameters and Property Range of Constituents
Modelling the Sliding Behaviour of Tribofilms Forming During Automotive Braking: Impact of Loading Parameters and Property Range of Constituents
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DOI：
10.1007/s11249-013-0274-z
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发表时间：
2013
影响因子：
3.2
通讯作者：
Andrey I. Dmitriev;W. Österle
中科院分区：
文献类型：
--
作者：
Andrey I. Dmitriev;W. Österle
用可移动元胞自动机(MCA)方法研究了压力、滑动速度和成分性质变化对模型摩擦膜滑动行为的影响。尽管摩擦系数(COF)对压力的依赖关系一直很明显，并且可以根据机械混合层的不同厚度与结构的形成相关联，但其他参数的影响要么可以忽略，要么相当弱。只有假设氧化物基摩擦膜发生脆性到韧性的转变，才能预测COF水平的显著下降。在MCA建模过程中，与温度相关的性质变化可以忽略不计，除非发生这种转变。对于磁铁矿基摩擦薄膜，转变温度超过800°C，即无论如何，该温度会导致制动过程中的褪色效应。因此，可以得出结论，除了非常恶劣的制动条件外，使用MCA方法的滑动模拟产生了有意义的结果，而不考虑温度依赖的机械特性。
The impact of pressure, sliding velocity and property variation of constituents on the sliding behaviour of a model tribofilm was studied with the method of movable cellular automata (MCA). Whereas a clear pressure dependency of the coefficient of friction (COF) was always observed and could be correlated with the structure formation in terms of varying thickness of a mechanically mixed layer, the impact of the other parameters was either negligible or rather weak. Only if a brittle-to-ductile transition of the oxide-based tribofilm was assumed, a significant decrease in the COF level was predicted. Temperature-dependent property changes can be neglected during MCA modelling, unless this transition takes place. For magnetite-based tribofilms, the transition temperature is beyond 800°C, i.e. a temperature leading to fading effects during braking anyway. Thus, it could be concluded that, except for very severe braking conditions, sliding simulations with the MCA method yield meaningful results without considering temperature-dependent mechanical properties.