Comparing surface topography parameters of rough surfaces obtained with spectral moments and deterministic methods

Abstract

Understanding contact between rough surfaces is of critical importance to the design of many engineering applications. Contact models rely on material properties and surface topography of the contacting surfaces as input parameters. Hence, the relevance of the contact models is dependent on their inherent assumptions and the accuracy with which the input parameters are determined. We have evaluated the difference between the surface topography parameters calculated with a statistical and deterministic approach for actual engineering surfaces. We have found topography values that change up to 300% depending on the method used, and attribute this to the stringent definition of an asperitypeak in the case of deterministic analysis as opposed to statistical analysis, which not only considers asperity-peaks but also asperity-shoulders.

Evaluation of Wear Phenomena of Journal Bearings by Close to Component Testing and Application of a Numerical Wear Assessment

“…The asperity contact pressure as a function of the normalized fluid film thickness H = (h −z s )/σ is given by Equation (3). The parameters η s , β, σ,z s and σ s were calculated by using statistical methods [43]:…”

Micro-Bulges Investigation on Laser Modified Tool Steel Surface

“…Most laser processing experimental design prefers pulse mode for a better control the surface integrity. Overlapping pulses, parameters design and material flow behavior affected micro-bulges formation and vary topography of the modified surface [7]. Previous studies found irregularities and mechanical effects resulted from the laser pulses which analyzed by the distribution of residual stress and microhardness on treated surfaces [11].…”

“…Surface roughness plays an important role in controlling friction and wear between two contact areas during processing [3], [5], [6]. Excessive friction between contact surfaces after thousands cycles during processing produces abundant heat resulted in reduced die lifecycle [1], [7].…”

“…Surface texture affects friction by creating resistance that prevented fluid from escaping from surface contact [3], [5]- [7]. Surface topography and structure influenced friction that between contact surfaces.…”

“…Previous studies found irregularities and mechanical effects resulted from the laser pulses which analyzed by the distribution of residual stress and microhardness on treated surfaces [11]. In order to design most engineering applications, good understanding between mechanical interaction between rough surface become essential [7].…”