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Evaluation of the real contact area in three-body dry friction by micro-thermal analysis

Stempflé, Philippe and Pantalé, Olivier and Djilali, Toufik and Njiwa, Richard Kouitat and Bourrat, Xavier and Takadoum, Jamal Evaluation of the real contact area in three-body dry friction by micro-thermal analysis. (2010) Tribology International, vol. 43 (n° 10). pp. 1794-1805. ISSN 0301-679X

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Official URL: http://dx.doi.org/10.1016/j.triboint.2009.12.001

Abstract

Many tribological properties and wear mechanisms occurring on the micro-and nanoscale are strongly controlled by the so-called real contact area (Ar) which is a small fraction of the nominal or apparent contact area (Aa). The determination of Ar is often based on either (i) a geometrical approach describing the real geometry of contacting surfaces or (ii) a mechanical approach involving contact mechanics and physical-mechanical properties. In addition some experimental methods have also been attempted but they generally do not take into account the presence of third body at the interface—i.e. the wear debris trapped within the contact. In this paper we propose an experimental approach to estimate the dynamic real contact area from the operating parameters (Fn, v, T) and the tribological responses (μ, Ft) in presence of third body. A scanning thermal microscope (SThM) is used for determining both the thermal conductivity of the third body and the relationship between the contact temperature and the thermal power really dissipated at the micro-asperity level. These results are combined with a thermal model of the macro-tribocontact for computing the real contact area and the real contact pressure. Validation of these results is carried out using a classical Greenwood Williamson model and finite element models built from the real AFM maps.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Tribology International website : http://www.sciencedirect.com/science/article/pii/S0301679X09003363
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Ecole Nationale Supérieure de Mécanique et des Microtechniques - ENSMM (FRANCE)
Other partners > Institut National Polytechnique de Lorraine - INPL (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Université de Franche-Comté (FRANCE)
Other partners > Université de Technologie de Belfort-Montbéliard - UTBM (FRANCE)
French research institutions > Bureau de recherches géologiques et minières - BRGM
Other partners > Université Henri Poincaré-Nancy1 - UHP (FRANCE)
Other partners > Université d'Orléans (FRANCE)
Laboratory name:
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Deposited By: Olivier Pantalé

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