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A web site APP for rough contact adhesion from simple Ciavarella BAM model

Mike Ciavarella's picture


See online App for rough contact adhesion based on the BAM model of Ciavarella


This is just a single closed form equation, which rivals and competes with the cumbersome 5 dimensional integrals of the theory of Persson and Scaraggi [2014] which is sold commercially (see for a high price, and is not public domain.


This single line equation explains the very sophisticated data of Pastewka and Robbins [2014] on PNAS, about pull-off, despite contrasts with the conclusion of Pastewka and Robbins that stickiness should depend only on rms slopes and rms curvatures. Indeed, in the BAM theory, pull-off depends only on rms amplitude of roughness!


[1] M. Ciavarella,  A very simple estimate of adhesion of hard solids with rough surfaces based on a bearing area model, Meccanica, DOI 10.1007/s11012-017-0701-6.


[2] Persson, B. N., & Scaraggi, M. (2014). Theory of adhesion: Role of surface roughness. The Journal of chemical physics, 141(12), 124701.


[3] Pastewka, L., & Robbins, M. O. (2014). Contact between rough surfaces and a criterion for macroscopic adhesion. Proceedings of the National Academy of Sciences, 111(9), 3298-3303.



Mike Ciavarella's picture

There were some errors in the earlier version, that some people noticed, thank you for help.


Now the APP finds the pull-off force also, and is corrected.

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