How does roughness kill adhesion?
File(s)
Published version
Author(s)
Afferrante, L
Violano, G
Dini, D
Type
Journal Article
Abstract
It is well-known that adhesion is strongly influenced by surface roughness. Nevertheless, the
literature currently contains an ongoing debate regarding which roughness scales are primarily
responsible for adhesion loss. In this study, we aim to contribute to this debate by conducting
numerical simulations on self-affine fractal profiles with varying fractal dimensions.
Our results reveal that the long-wavelength portion of the roughness spectrum plays a
crucial role in killing adhesion when considering profiles with Hurst exponent 𝐻 > 0.5.
Conversely, for profiles with 𝐻 < 0.5, results show a different trend, indicating that adhesive
stickiness is also influenced by short wavelength roughness. These findings are corroborated by
our recent experimental observations. In such case, adhesive hysteresis and pull-off force exhibit
a continuous decrease with increasing roughness scales. However, for 𝐻 > 0.5, the pull-off force
converges towards a finite value as the magnification increases.
literature currently contains an ongoing debate regarding which roughness scales are primarily
responsible for adhesion loss. In this study, we aim to contribute to this debate by conducting
numerical simulations on self-affine fractal profiles with varying fractal dimensions.
Our results reveal that the long-wavelength portion of the roughness spectrum plays a
crucial role in killing adhesion when considering profiles with Hurst exponent 𝐻 > 0.5.
Conversely, for profiles with 𝐻 < 0.5, results show a different trend, indicating that adhesive
stickiness is also influenced by short wavelength roughness. These findings are corroborated by
our recent experimental observations. In such case, adhesive hysteresis and pull-off force exhibit
a continuous decrease with increasing roughness scales. However, for 𝐻 > 0.5, the pull-off force
converges towards a finite value as the magnification increases.
Date Issued
2023-12
Date Acceptance
2023-10-13
Citation
Journal of the Mechanics and Physics of Solids, 2023, 181
ISSN
0022-5096
Publisher
Elsevier
Journal / Book Title
Journal of the Mechanics and Physics of Solids
Volume
181
Copyright Statement
© 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license
(http://creativecommons.org/licenses/by-nc-nd/4.0/).
(http://creativecommons.org/licenses/by-nc-nd/4.0/).
Identifier
http://dx.doi.org/10.1016/j.jmps.2023.105465
Publication Status
Published
Article Number
105465
Date Publish Online
2023-10-20