Atomic-Scale Front Propagation at the Onset of Frictional Sliding

Silvia Bonfanti, Alessandro Taloni, Carlotta Negri, Alessandro L. Sellerio, Nicola Manini, Stefano Zapperi*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

Macroscopic frictional sliding emerges from atomic-scale interactions and processes at the contact interface, but bridging the gap between micro and macro scales still remains an unsolved challenge. Direct imaging of the contact surface and simultaneous measurement of stress fields during macroscopic frictional slip revealed the formation of crack precursors, questioning the traditional picture of frictional contacts described in terms of a single degree of freedom. Here we study the onset of frictional slip on the atomic scale by simulating the motion of an aluminum block pushed by a slider on a copper substrate. We show the formation of dynamic slip front propagation and precursory activity that resemble macroscopic observations. The analysis of stress patterns during slip, however, reveals subtle effects due to the lattice structures that hinder a direct application of linear elastic fracture mechanics. Our results illustrate that dynamic front propagation arises already on the atomic scales and shed light on the connections between atomic-scale and macroscopic friction.

Original languageEnglish
Pages (from-to)5438-5443
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume8
Issue number21
DOIs
Publication statusPublished - 2 Nov 2017
MoE publication typeA1 Journal article-refereed

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