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On the effect of shear loading rate on contact area shrinking in adhesive soft contacts
Citation Link: https://doi.org/10.15480/882.3459
Publikationstyp
Journal Article
Date Issued
2021-04-02
Sprache
English
Author(s)
Papangelo, Antonio
Institut
TORE-DOI
TORE-URI
Journal
Volume
69
Issue
2
Article Number
48
Citation
Tribology Letters 69 (2): 48 (2021-06-01)
Publisher DOI
Scopus ID
Publisher
Springer International Publishing
Adhesion and, its interplay with friction, is central in several engineering applications involving soft contacts. Recently, there has been an incredible push towards a better understanding on how the apparent contact area evolves when a shear load is applied to an adhesive soft contact, both experimentally and theoretically. Although soft materials are well-known to exhibit rate-dependent properties, there is still a lack of understanding in how the loading rate could affect the contact area shrinking. Indeed, most of the experiments involving a sphere-flat contact have been conducted at a fixed loading rate, and, so far, analytical models have assumed a constant work of adhesion, independent on the peeling velocity. Here, by using linear elastic fracture mechanics, an analytical model is derived for the contact of a rigid sphere on a soft adhesive substrate, which is aimed at elucidating the effect that a rate-dependent work of adhesion has on the contact area shrinking. The model results show that contact area reduction is very sensitive to the loading rate, with slower loading rates promoting a stronger shrinking, which seems in agreement with Literature results. Furthermore it is shown that rate effects enhance the apparent interfacial toughness, i.e. more energy is needed to drive the system from full stick up to gross sliding.
Subjects
Adhesion
Contact area
Friction
Soft matter
DDC Class
600: Technik
Funding Organisations
More Funding Information
Open access funding provided by Politecnico di Bari within the CRUI-CARE Agreement.. A.P. acknowledges the support by the Italian Ministry of Education, University and Research under the Programme Department of Excellence Legge 232/2016 (Grant No. CUP-D94I18000260001). A.P. acknowledges support from “PON Ricerca e Innovazione 2014-2020-Azione I.2” - D.D. n. 407, 27/02/2018, bando AIM (Grant No. AIM1895471).
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