THE MODEL BASED ON ACCELERATING WORN SURFACES IN MECHANICAL SEAL
Surface topography is important for sealing performance of mechanical seal. However, many researches were based on invariable surface topography and constant friction duty and only a few researchers took the change of it into account when establishing models. How to characterize surface topography? Arithmetical mean deviation Ra is dimension-dependent and can’t reflect the non-stationary random properties of friction pairs and the precise information of interface’s topography. Though fractal dimension D is independent of scale, it can not determine a rough surface uniquely. Fractal roughness RD can avoid the impact of instrument resolution and length of sample on measurement of rough surface, characterizing surface topography of mechanical seal faces effectively. On the basis of pi-theorem and the same fractal roughness has the same friction characteristics, an accelerated test model of surface friction and wear in mechanical seal was established.