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Publisher DOI: 10.1103/PhysRevLett.122.214301
Title: Shear-induced anisotropy in rough elastomer contact
Language: English
Authors: Sahli, R. 
Pallares, G. 
Papangelo, A. 
Ciavarella, M. 
Ducottet, C. 
Ponthus, N. 
Scheibert, J. 
Issue Date: 30-May-2019
Publisher: American Institute of Physics
Source: Physical Review Letters 122 (21): 214301 (2019)
Abstract (english): 
True contact between randomly rough solids consists of myriad individual microjunctions. While their total area controls the adhesive friction force of the interface, other macroscopic features, including viscoelastic friction, wear, stiffness, and electric resistance, also strongly depend on the size and shape of individual microjunctions. We show that, in rough elastomer contacts, the shape of microjunctions significantly varies as a function of the shear force applied to the interface. This process leads to a growth of anisotropy of the overall contact interface, which saturates in the macroscopic sliding regime. We show that smooth sphere-plane contacts have the same shear-induced anisotropic behavior as individual microjunctions, with a common scaling law over 4 orders of magnitude in the initial area. We discuss the physical origin of the observations in light of a fracture-based adhesive contact mechanics model, described in the companion article, which captures the smooth sphere-plane measurements. Our results shed light on a generic, overlooked source of anisotropy in rough elastic contacts, not taken into account in current rough contact mechanics models.
DOI: 10.15480/882.4203
ISSN: 1079-7114
Journal: Physical review 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: This work was supported by LABEXMANUTECH-SISE (ANR-10-LABX-0075) of the Universit´e de Lyon, within the program Investissements d’Avenir (ANR-11-IDEX-0007) operated by the French National Research Agency (ANR). It received funding from the People Program (Marie Curie Actions) of the European Union’s Seventh Framework Program (FP7/2007-2013) under Research Executive Agency Grant Agreement No. PCIG-GA-2011-303871. We are indebted to Institut Carnot Ing´enierie@Lyon for support and funding. A. P. is thankful to the DFG (German Research Foundation) for funding Project No. PA 3303/1-1. M. C. is supported by the Italian Ministry of Education, University and Research (MIUR) under the “Departments of Excellence” grant L.232/2016.
Publisher's Creditline: To cite this version: R. Sahli, G. Pallares, A. Papangelo, M. Ciavarella, C. Ducottet, N. Ponthus, and J. Scheibert. Shear-Induced Anisotropy in Rough Elastomer Contact. Physical Review Letters, American Physical Society, 2019, 122 (21), pp. 214301. 10.1103/PhysRevLett.122.214301
License: In Copyright In Copyright
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