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000860478 1001_ $$0P:(DE-Juel1)130885$$aPersson, Bo$$b0$$eCorresponding author$$ufzj
000860478 245__ $$aSome Comments on Hydrogel and Cartilage Contact Mechanics and Friction
000860478 260__ $$aDordrecht$$bSpringer Science  Business Media B.V.$$c2018
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000860478 520__ $$aWe discuss the origin of the low friction observed for some elastically soft materials, such as hydrogels and the human cartilage. When a soft elastic solid is squeezed against another solid in a fluid, if the nominal contact pressure is high enough, after long enough contact time the contact area percolates, resulting in islands of confined fluid. For charged surfaces, with charges of equal sign, the osmotic pressure in the area of “real contact” may be large enough to keep the surfaces separated at nanometer separation. In this case the solid contact pressure (here the osmotic pressure) in the area of “real contact” will be nearly independent of the external load. The finite surface separation in the area of “real contact” results in a very small (breakloose) friction force even after long time of stationary contact
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