Numerical simulation of typical contact situations of brake friction materials
Numerical simulation of typical contact situations of brake friction materials
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DOI：
10.1016/j.triboint.2007.04.001
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发表时间：
2008
影响因子：
6.2
通讯作者：
A. Dmitriev;W. Österle;H. Kloβ
中科院分区：
文献类型：
--
作者：
A. Dmitriev;W. Österle;H. Kloβ
基于可移动元胞自动机的方法，建立了典型的汽车制动器接触工况模型。分析了汽车制动系统局部触点处发生的过程。基于微观和微观分析的观察，模拟了以下接触情况：(i)一对铁素体钢与珠光体钢的接触，两者都被混合石墨纳米颗粒的氧化层覆盖；（ii）同样的情况，但没有氧化层。计算得出的氧化对氧化接触的平均摩擦系数与实际制动系统的期望值相当，而钢对钢接触的平均摩擦系数是实际制动系统的两倍。这可以让我们得出一些结论；例如，氧化物的形成会比摩擦层的消除更快，最后这是摩擦系数稳定的原因。
In the paper, a model typical for contact situations of automotive brakes is established based on the method of movable cellular automata. The processes taking place at local contacts in an automotive brake system are analysed. Based on microscopic and micro-analytical observations, the following contact situations were simulated: (i) a couple of ferritic steel against pearlitic steel, both covered by an oxide layer mixed with graphite nanoparticles and (ii) the same situation but without oxide layers. The results of calculated mean coefficients of friction of the oxide-on-oxide contact correspond well to expected values for a real braking system, whereas steel-on-steel contact are twice as high. This allows one to make some conclusions; for example, oxide formation will take place more quickly than friction layer elimination, and finally this is responsible for the stabilisation of the coefficient of friction.