Abstract
Numerical models of granular materials are useful in tribology, and can be used to predict wear and friction in contacts. DEM-like simulations are used to model particles of third-body, which are partly wear debris from rubbing bodies. It has been shown that the third-body particles can have different flow regimes, depending on their mechanical properties. Among the different characteristics of flow regimes, agglomerate size seems to be crucial. A method based on vortex analysis used in fluid mechanics allows characterizing this cluster size. The results show that different vortex sizes can be observed during the simulation. In particular, it is observed that some vortexes of a characteristic size persist over time, and could be representative of agglomerates. These results pave the way for a better characterisation of the different flow regimes.
Highlights
1.1 Tribology and third-bodyTribology describes the interaction between two interacting surfaces in relative motion
We present hereafter a methodology to characterize and quantify this vorticity
Where S is a disk of radius R and of centre P(x, y), M is a point in this disk, V is the velocity of M, Vave is the average velocity in the disk, and Vrad is a velocity field corresponding to a rigid-body rotation of unit angular velocity and centred on P
Summary
Tribology describes the interaction between two interacting surfaces in relative motion This contact can lead to wear or fatigue, and to the breakage of mechanical parts. The third-body approach, developed by Godet [1], and Berthier [2], is widely used in tribology. This approach considers that between the two rubbing bodies, a “third body” made of wear debris inevitably appears and modifies the interface frictional response. It accommodates velocities, transmits normal and tangential loads, and may protect or damage surfaces
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