Abstract
Understanding of the mechanism of “rubbing” noise and low amplitude friction exited vibration generation in steady sliding can be helped by models describing the contact interactions. In the current paper, we consider a simple microscopic contact model for surfaces in sliding, which is based on the adhesion theory of friction. In the proposed model, we consider that the formation and shearing of a junction contributes to a small change in the real contact area. The model incorporates random size and random spacing between junctions. We investigate the dependence of the instantaneous real contact area on the average size and number of junctions. We find that, from the viewpoint of vibration reduction, it is advantageous if the real contact area needed to support a given load is obtained as a sum of many small-sized micro-contacts, instead of few large-sized micro-contacts. The above result is in agreement with experimentally observed reduction of vibrations of a hard-disc slider after texturing.
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