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Publisher DOI: 10.1007/s11249-021-01426-w
Title: On the effect of shear loading rate on contact area shrinking in adhesive soft contacts
Language: English
Authors: Papangelo, Antonio 
Keywords: Adhesion; Contact area; Friction; Soft matter
Issue Date: 2-Apr-2021
Publisher: Springer International Publishing
Source: Tribology Letters 69 (2): 48 (2021-06-01)
Abstract (english): 
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.
DOI: 10.15480/882.3459
ISSN: 1023-8883
Journal: Tribology letters 
Institute: Strukturdynamik M-14 
Document Type: Article
Project: Untersuchung und Anwendung komplexer, nichtlinearer, dynamischer Zustände in reiberregten mechanischen Systemen 
Funded by: Deutsche Forschungsgemeinschaft (DFG) 
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).
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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