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# A random process asperity model for adhesion between rough surfaces

Publikationstyp

Journal Article

Publikationsdatum

2017-11-17

Sprache

English

Author

Papangelo, Antonio

Institut

TORE-URI

Enthalten in

Volume

31

Issue

22

Start Page

2445

End Page

2467

Citation

Journal of Adhesion Science and Technology 22 (31): 2445-2467 (2017-11-17)

Publisher DOI

Scopus ID

A simple asperity model using random process theory is developed in the presence of adhesion, using the Derjaguin, Muller and Toporov model for each individual asperity. A new adhesion parameter is found, which perhaps improves the previous parameter proposed by Fuller and Tabor which assumed identical asperities–the model in all his variants for the radius always gives a finite pull-off force, as in Fuller and Tabor, and contrary to the exponential asperity height distribution, where the force is either always compressive, or always tensile. It is shown that a model with spheres having a radius only dependent on height is a reasonable approximation with respect to models having also a distribution of radius curvatures–the three models differ considerably, as opposed to the adhesionless case where these details did not matter. The important surface parameters in the theory determining the pull-off force are the three moments m0, m2, m4. The asymptotic form of the model at large separation is solved in closed form. As the theoretical pull-off of aligned asperities having the same radius (the average value) increases with the square root of the Nayak bandwidth of the roughness, and as asperity models are known to describe less well the surface at large bandwidth parameters, the limit behavior at large bandwidths remains uncertain.