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On stickiness of multiscale randomly rough surfaces
Publikationstyp
Journal Article
Date Issued
2021
Sprache
English
Author(s)
Institut
TORE-URI
Journal
Volume
97
Issue
6
Start Page
509
End Page
527
Citation
Journal of Adhesion 97 (6): 509-527 (2021)
Publisher DOI
Scopus ID
Publisher
Taylor & Francis
A new stickiness criterion for solids having random fractal roughness is derived using Persson’s theory with DMT-type adhesion. As expected, we find that stickiness, i.e. the possibility to sustain macroscopic tensile pressures or else non-zero contact area without load, is not affected by the truncation of the PSD spectrum of roughness at short wavelengths and can persist up to roughness amplitude orders of magnitude larger than the range of attractive forces. With typical nanometre values of the latter, the criterion gives justification to the well-known empirical Dalhquist criterion for stickiness that demands adhesives to have elastic modulus lower than about 1 MPa.
Subjects
adhesion
Dalhquist criterion
dry adhesion
Stickiness criterion
surface roughness
DDC Class
600: Technik
Funding Organisations
More Funding Information
A.P. acknowledges support from “PON Ricerca e Innovazione 2014-2020 – Azione I.2 – D.D. n. 407, 27/02/2018, bando AIM”. M.C. is thankful to Prof. J.R. Barber and Prof. S. Abbott for some discussions. L.A. acknowledges support from “POR Puglia FESR-FSE 2014-2020 – Azione 1.6, bando Innonetwork”. All authors acknowledge support from the Italian Ministry of Education, University and Research (MIUR) under the program “Departments of Excellence” (L.232/2016).