On the accurate computation of the true contact-area in mechanical contact of random rough surfaces

Vladislav Yastrebov 1 Guillaume Anciaux 2 Jean-François Molinari 3
1 MAT - Centre des Matériaux
2 EPFL - Ecole Polytechnique Fédérale de Lausanne
3 LSMS - Laboratoire de Simulation en Mécanique des Solides
Abstract : We introduce a corrective function to compensate errors in contact area computations coming from mesh discretization. The correction is based on geometrical arguments, and apart from the contact area itself requires only one additional quantity to be computed: the length of contact/non-contact interfaces. The new technique enables to evaluate accurately the true contact area using a very coarse mesh, for which the shortest wavelength in the surface spectrum reaches the grid size. The validity of the approach is demonstrated for surfaces with different fractal dimensions and different spectral content using a properly designed mesh convergence test. In addition, we use a topology preserving smoothing technique to adjust the morphology of contact clusters obtained with a coarse grid.
Keywords : Surface roughness Contact area Contact area correction Simulations Boundary element method
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01518514
Contributeur : Bibliothèque Umr7633 <>
Soumis le : jeudi 4 mai 2017 - 17:45:38
Dernière modification le : vendredi 25 octobre 2019 - 10:28:09

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Vladislav Yastrebov, Guillaume Anciaux, Jean-François Molinari. On the accurate computation of the true contact-area in mechanical contact of random rough surfaces. Tribology International, Elsevier, 2017, 114, pp.161-171. ⟨10.1016/j.triboint.2017.04.023⟩. ⟨hal-01518514⟩

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