A model for face-turned surface microgeometry: Application to the analysis of metallic static seals

In general, to construct a model of surface microgeometry, one must perform a statistical analysis of peaks (that is, obtain information on the altitude of the peaks’ summits and occasionally the peaks’ radii as well) involving in the main isotropic surfaces. This paper is essentially devoted to the application of this technique to anisotropic surfaces such as those obtained by face turning. Additionally, the classical distribution of peak dimensions was completed by a statistical analysis of valleys. Valley dimensions play a key role in various tribological phenomena such as static sealing applications where leakage arises from fluid circulation along the valleys. The present approach reveals that sealing performance is not only due to the amplitude of roughness (i.e. Ra parameter) but also due to the variability of valley altitudes.