Soft lubrication

Details Soft lubrication Soft lubrication

2004-04-04

arxiv.org/abs/cond-mat/0404062v2

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 3 figures; to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.92.245509

We consider some basic principles of fluid-induced lubrication at soft interfaces. In particular, we show how the presence of a soft substrate leads to an increase in the physical separation between surfaces sliding past each other. By considering the model problem of a symmetric non-conforming contact moving tangentially to a thin elastic layer, we determine the normal force in the small and large deflection limit, and show that there is an optimal combination of material and geometric properties which maximizes the normal force. Our results can be generalized to a variety of other geometries which show the same qualitative behavior. Thus they are relevant in the elastohydrodynamic lubrication of soft elastic and poroelastic gels and shells, and in the context of bio-lubrication in cartilaginous joints.

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