Atomic-Scale Front Propagation at the Onset of Frictional Sliding
| Autor: | Silvia Bonfanti, Stefano Zapperi, Carlotta Negri, Nicola Manini, Alessandro Taloni, Alessandro L. Sellerio |
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| Rok vydání: | 2017 |
| Předmět: |
DYNAMICS
Copper substrate Materials science ta221 Nanotechnology Direct imaging 02 engineering and technology Slip (materials science) STICK-SLIP MOTION 01 natural sciences Atomic units Physics::Geophysics FORCE NANOSCALE Slider 0103 physical sciences General Materials Science Physical and Theoretical Chemistry 010306 general physics PRECURSORS ta114 ORIGIN Mechanics 021001 nanoscience & nanotechnology ADSORBED LAYERS Frictional slip MODEL Front propagation 0210 nano-technology Single degree of freedom |
| Zdroj: | The journal of physical chemistry letters 8 (2017): 5438–5443. doi:10.1021/acs.jpclett.7b02414 info:cnr-pdr/source/autori:Bonfanti S.; Taloni A.; Negri C.; Sellerio A.L.; Manini N.; Zapperi S./titolo:Atomic-Scale Front Propagation at the Onset of Frictional Sliding/doi:10.1021%2Facs.jpclett.7b02414/rivista:The journal of physical chemistry letters/anno:2017/pagina_da:5438/pagina_a:5443/intervallo_pagine:5438–5443/volume:8 |
| ISSN: | 1948-7185 |
| DOI: | 10.1021/acs.jpclett.7b02414 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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