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Research Article | Open Access

Is there more than one stickiness criterion?

Anle WANG1, Martin H. MÜSER1,2( )
Department of Material Science and Engineering, Saarland University, Saarbrücken 66123, Germany
INM–Leibniz Institute for New Materials, Saarbrücken 66123, Germany
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Abstract

Adhesion between an elastic body and a smooth, rigid substrate can lead to large tensile stresses between them. However, most macroscopic objects are microscopically rough, which strongly suppresses adhesion. A fierce debate has unfolded recently as to whether local or global parameters determine the crossover between small and large adhesion. Here, we report simulations revealing that the dependence of the pull-off force Fn on the surface energy γ does not only have two regimes of high and low adhesion but up to four regimes. They are related to contacts, which at the moment of rupture consist of (i) the last individual Hertzian-shaped contact, in which is linear in γ, (ii) a last meso-scale, individual patches with super-linear scaling, (iii) many isolated contact patches with extremely strong scaling, and (iv) a dominating largest contact patch, for which the pull-off stress is no longer negligible compared to the maximum, microscopic pull-off stress. Regime (iii) can be seen as a transition domain. It is located near the point where the surface energy is half the elastic energy per unit area in conformal contact. A criterion for the transition between regimes (i) and (ii) appears difficult to grasp.

Keywords

adhesionpull-off forcerough contactstickiness

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Friction
Volume 11 Issue 6,
June 2023
Pages 1027-1039
DOI: 10.1007/s40544-022-0644-3
Cite this article:
WANG A, MÜSER MH. Is there more than one stickiness criterion?. Friction, 2023, 11(6): 1027-1039. https://doi.org/10.1007/s40544-022-0644-3

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Received: 18 February 2022
Revised: 08 April 2022
Accepted: 29 April 2022
Published: 12 June 2022
© The author(s) 2022.

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