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An expert system to characterise the surfaces morphological properties according to their tribological functionalities: The relevance of a pair of roughness parameters

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2013
auteur(s) Bigerelle Maxence; Najjar Denis; Mathia Thomas; Iost Alain; Coorevits Thierry; Anselme Karine
journal (abréviation) Tribology International (Tribol Int)
volume (numéro) 59
pages 190 – 202
résumé Knowing that a surface or profile can be characterised by numerous roughness parameters, the objective of this investigation was to present a methodology which aims to determining quantitatively and without preconceived opinion the most relevant pair of roughness parameters that describe an abraded surface. The methodology was firstly validated on simulated fractal profiles having different amplitudes and Hölder exponents and it was secondly applied to characterise different worn regions of a retrieved metallic femoral head articulated against an ultra-high molecular weight polyethylene (UHMWPE) acetabular cup containing an embedded metallic fibber into its surface. The methodology consists in combining the recent Bootstrap method with the usual discriminant analysis. It was validated on simulated fractal profiles showing that, among more than 3000 pairs tested, the total amplitude Rt and the fractal dimension Δ is the most relevant pair of roughness parameters; parameters corresponding to the variables modulated in the analytical expression of the fractal function. The application of this methodology on a retrieved metallic femoral head shows that the most relevant pair of parameters for discriminating the different investigated worn regions is the arithmetic roughness parameter Ra paired with the mean peak height Rpm. This methodology finally helps in a better understanding of the scratch mechanism of this orthopaedic bearing component.
mots clés Roughness; Discriminant analysis; Femoral head; Third body abrasive mechanism
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