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On the degree of irreversibility of friction in sheared soft adhesive contacts
Citation Link: https://doi.org/10.15480/882.2940
Publikationstyp
Journal Article
Date Issued
2020-07-23
Sprache
English
Author(s)
Papangelo, Antonio
Institut
TORE-DOI
TORE-URI
Journal
Volume
68
Issue
3
Article Number
81
Citation
Tribology Letters 3 (68): 81 (2020-09-01)
Publisher DOI
Scopus ID
Publisher
Springer International Publishing
A number of authors have experimentally assessed the influence of friction on adhesive contacts, and generally the contact area has been found to decrease due to tangential shear stresses at the interface. The decrease is however generally much smaller than that predicted already by the Savkoor and Briggs 1977 classical theory using “brittle” fracture mechanics mixed mode model extending the JKR (Griffith like) solution to the contact problem. The Savkoor and Briggs theory has two strong assumptions, namely that (i) shear tractions are also singular at the interface, whereas they have been found to follow a rather constant distribution, and that (ii) no dissipation occurs in the contact. While assumption (ii) has been extensively discussed in the Literature the role of assumption (i) remained unclear. We show that assuming entirely reversible slip at the interface with a constant shear stress fracture mechanics model leads to results almost indistinguishable from the Savkoor and Briggs model (and further in disagreement with experiments), hence it is assumption (ii) that critically affects the results. We analyze a large set of experimental data from Literature and show that the degree of irreversibility of friction can vary by orders of magnitude, despite similar materials and geometries, depending on the velocity at which the tangential load is applied.
Subjects
Adhesion
Cohesive models
Fracture mechanics
Friction
Mixed mode
Soft matter
DDC Class
600: Technik
More Funding Information
Open access funding provided by Politecnico di Bari within the CRUI-CARE Agreement. A.P. and M.C. acknowledge the support by the Italian Ministry of Education, University andResearch under the Programme Department of Excellence Legge 232/2016 (Grant No. CUP-D94I18000260001). A.P. is thankful to the DFG (German Research Foundation) for funding theproject PA 3303/1-1. 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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