The discussion revolves around the nature of friction, specifically focusing on the role of adhesion and deformation of surface protuberances. Participants explore whether deformation is elastic or inelastic, the effects of applying force through a hydraulic press, and the terminology used in tribology.
Participants express differing views on the nature of deformation (elastic vs. inelastic) and the effects of applying force through a hydraulic press. The discussion remains unresolved regarding the specifics of deformation without external force and the appropriate terminology in the context of tribology.
Participants acknowledge that the deformation characteristics may depend on various factors, including material properties and surface roughness, but do not reach a consensus on these points.
... and intermolecular interactions (for example Van der Waals forces)mark2142 said:Friction happens because of adhesion between high points of the pertubrances of the two surfaces
It will most likely depend on the material type and roughness (shape of the protuberances).mark2142 said:Is the deformation elastic or inelastic?
One can imagine that the hydraulic press cannot make a surface smoother than its own surface.mark2142 said:Will the surface of one body become smoother if pressed with hydraulic press?
Like rubber vs steel. I guess what you are saying is Steel pertubrances too get deformed elastically to a certain point but that would require large hydraulic force. Got it!jack action said:... and intermolecular interactions (for example Van der Waals forces)
It will most likely depend on the material type and roughness (shape of the pertubrances).
One can imagine that the hydraulic press cannot make a surface smoother than its own surface.
Even assuming a high smoothness of the press surface, it might break some peaks, but at a certain point, the deformation might be only elastic. If you add force to a point of plastic deformation, the whole part will probably break/deform as well.
How would they deform if there is no force acting on them?mark2142 said:Do pertubrances deform elastically while sitting on surfaces , without any force on them?
"pertubrances"? I think you meant "protuberances".mark2142 said:Friction happens because of adhesion between high points of the pertubrances of the two surfaces. The pertubrances deform.
I meant no force other than mg.jack action said:How would they deform if there is no force acting on them?
Where's the mystery here? Just look at macroscopic objects. If you stand on something it could deform temporarily and then return to its former shape (e.g. a door mat); or, it could remain deformed (e.g. a gravel path).mark2142 said:Do pertubrances deform elastically while sitting on surfaces , without any force on them?