Tribological systems can be strongly influenced by the presence of an intermediate layer of hard particles. These particles affect the coefficient of friction, wear and even the surface morphology of the first bodies. Therefore, a straightforward mechanical substitute model is introduced, which describes how hard particles of almost arbitrary geometry influence the dynamics of a tribological system. Based on this model, a system characterizing quantity, the velocity limit, is defined. Permanent contact exists only if the tangential relative velocity of the first bodies is below this velocity limit, otherwise, the contact is temporarily interrupted. First experiments confirm the applicability of the analytically derived velocity limit. Th us the model proves to be a valid tool to describe this velocity dependent phenomenon.

硬颗粒中间层的存在会严重影响摩擦系统。这些颗粒会影响第一主体的摩擦系数，磨损甚至表面形态。因此，引入了一种简单的机械替代模型，该模型描述了几乎任意几何形状的硬质粒子如何影响摩擦系统的动力学。基于该模型，定义了一个系统特征量，即速度极限。只有当第一个实体的切向相对速度低于此速度限制时，才存在永久接触，否则，接触将暂时中断。最初的实验证实了解析得出的速度极限的适用性。我们证明该模型是描述这种速度相关现象的有效工具。