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A note on the pull-off force for a pattern of contacts distributed over a halfspace

Antonio Papangelo's picture

ArticleinMeccanica · March 2017 --- We found a very simple formula for pull-off force for a pattern of contacts distributed over an halfspace which could be very useful in predicting the adhesive propreties of structured surfaces, as bioinspired surfaces.  

  • 1st Antonio Papangelo17.7 · Technische Universität Hamburg
  • 2nd Luciano Afferrante 
  • 3rd Michele Ciavarella 

 Abstract:  We consider a series of flat contact spots distributed over a half-space, for which the pull-off force is proportional to the square root of the total contact area over the elastic compliance. By using an electro-mechanical analogy to compute the compliance using the well-known Greenwood–Holm equation, we show how the pull-off decays for fractal patterns of contact spots with simple scaling laws, tending to zero in a fractal limit, as the contact area goes to zero. Moreover, a qualitative assessment is made for contact of fractal rough surfaces, and it is shown that pull-off in this case is dominated by the value of the contact area reached during the loading process, which depends on the applied load, suggesting pressure-sensitive adhesion.

link to the article: https://www.researchgate.net/publication/314672453_A_note_on_the_pull-of...

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