Load and Velocity Dependence of Friction Mediated by Dynamics of Interfacial Contacts

Wengen Ouyang, Shivaprakash N. Ramakrishna, Antonella Rossi, Michael Urbakh, Nicholas D. Spencer, and Andrea Arcifa

Phys. Rev. Lett. 123, 116102 – Published 9 September 2019

Abstract

Studying the frictional properties of interfaces with dynamic chemical bonds advances understanding of the mechanism underlying rate and state laws, and offers new pathways for the rational control of frictional response. In this work, we revisit the load dependence of interfacial chemical-bond-induced (ICBI) friction experimentally and find that the velocity dependence of friction can be reversed by changing the normal load. We propose a theoretical model, whose analytical solution allows us to interpret the experimental data on timescales and length scales that are relevant to experimental conditions. Our work provides a promising avenue for exploring the dynamics of ICBI friction.

Received 17 March 2019
Revised 19 June 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.116102

Physics Subject Headings (PhySH)

Adhesion Chemical bonding Friction Lubrication Stress Surface & interfacial phenomena Tribology

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Wengen Ouyang¹, Shivaprakash N. Ramakrishna^2,*, Antonella Rossi^2,3, Michael Urbakh¹, Nicholas D. Spencer², and Andrea Arcifa ^2,†,‡

¹School of Chemistry and The Sackler Center for Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv 69978, Israel
²Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5,CH-8093 Zurich, Switzerland
³Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Cittadella Universitaria di Monserrato, I-09100 Cagliari, Italy

^*Corresponding author. shivaprakash.ramakrishna@mat.ethz.ch
^†Corresponding author. andrea.arcifa@empa.ch
^‡Present address: EMPA, Swiss Federal Institute for Material Science and Technology, Switzerland.

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Issue

Vol. 123, Iss. 11 — 13 September 2019

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