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TECHNICAL PAPERS

Friction Coefficient as a Macroscopic View of Local Dissipation

[+] Author and Article Information
D. Richard

Laboratoire de Mécanique des Contacts et des Structures, INSA-Lyon, CNRS UMR 5259, F69621 Villeurbanne, Francedavid.richard@insa-lyon.fr

I. Iordanoff

Laboratoire Matériaux Endommagement Fiabilité et Ingénierie des Procédés, ENSAM Université Bordeaux 1, Equipe d’accueil 27 27, Esplanade des Arts et Métiers, 33405 Talence, Franceivan.iordanoff@lamef.bordeaux.ensam.fr

Y. Berthier, M. Renouf, N. Fillot

Laboratoire de Mécanique des Contacts et des Structures, INSA-Lyon, CNRS UMR 5259, F69621 Villeurbanne, France

J. Tribol 129(4), 829-835 (May 30, 2007) (7 pages) doi:10.1115/1.2768083 History: Received January 22, 2007; Revised May 30, 2007

This paper presents an overview of a discrete element method approach to dry friction in the presence of a third body. Three dimensional computer simulations have been carried out to show the influence of the third body properties (and more specifically their adhesion) on friction coefficient and profiles of dissipated power. Simple interaction laws and a cohesive contact are set up to uncouple the key parameters governing the contact rheology. The model is validated through a global energy balance. As it is shown that dynamic friction coefficient can be explained only in terms of local energy dissipation, this work also emphasizes the fact that mechanism effects and third body rheology have important consequences on the energy generation and dissipation field. Therefore, asymmetries can arise and the surface temperature of first bodies can be significantly different even for the same global friction coefficient value. Such investigations highlight the fact that friction coefficient cannot be considered in the same way at the mechanism scale as at the contact scale where the third body plays a non-negligible role, although it has been neglected for years in thermal approaches to study of surfaces in contact.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Description of the dry contact through the DEM approach

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Figure 2

Boundary conditions in x and y directions

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Figure 3

Description of the contact cycle according to two N discretization values

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Figure 4

Powers at stake in the contact

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Figure 5

Power proportions in the third body for stiffness, adhesion, and dissipation forces

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Figure 6

The four possible third body regimes: (a) fluid, (b) semifluid, (c) elastoplastic, and (d) elastic

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Figure 7

Global friction coefficient evolution versus adhesion at constant pressure

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Figure 8

Initial condition for the annular shearing machine (up) and shearing profile with adhesion (down)

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Figure 9

Dissipated power profiles in the third body for the four different regimes

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Figure 10

Interface sliding percentage evolution versus interparticle adhesion

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Figure 11

Proportion of power dissipated at the interface and in the third body volume

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Figure 12

Different simplified heat source profiles for the fluid regime (a) and the elastic regime (b) and their consequences in terms of heat partition for the same first bodies’ properties

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