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Friction weakening by mechanical vibrations: A velocity-controlled process

Vidal, V. ; Oliver, C. ; Lastakowski, H. ; Varas, G. ; Géminard, J. -C.

The European physical journal. E, Soft matter and biological physics, 2019, Vol.42 (7), p.91-6, Article 91 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
Friction weakening by mechanical vibrations: A velocity-controlled process
Autor: Vidal, V. ; Oliver, C. ; Lastakowski, H. ; Varas, G. ; Géminard, J. -C.
Assuntos: Avalanches ; Biological and Medical Physics ; Biophysics ; Collapse ; Complex Fluids and Microfluidics ; Complex Systems ; Critical velocity ; Earthquakes ; General Physics ; Granular materials ; Granular media ; Landslides ; Nanotechnology ; Physics ; Physics and Astronomy ; Polymer Sciences ; Regular Article ; Soft and Granular Matter ; Surfaces and Interfaces ; Thin Films ; Velocity
É parte de: The European physical journal. E, Soft matter and biological physics, 2019, Vol.42 (7), p.91-6, Article 91
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: . Frictional weakening by vibrations was first invoked in the 70s to explain unusual fault slips and earthquakes, low viscosity during the collapse of impact craters or the extraordinary mobility of sturzstroms, peculiar rock avalanches which travels large horizontal distances. This mechanism was further invoked to explain the remote triggering of earthquakes or the abnormally large runout of landslides or pyroclastic flows. Recent experimental and theoretical works pointed out that the key parameter which governs frictional weakening in sheared granular media is the characteristic velocity of the vibrations. Here we show that the mobility of the grains is not mandatory and that the vibration velocity governs the weakening of both granular and solid friction. The critical velocity leading to the transition from stick-slip motion to continuous sliding is in both cases of the same order of magnitude, namely a hundred microns per second. It is linked to the roughness of the surfaces in contact. Graphical abstract
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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Friction weakening by mechanical vibrations: A velocity-controlled process

Vidal, V. ; Oliver, C. ; Lastakowski, H. ; Varas, G. ; Géminard, J. -C.

Berlin/Heidelberg: Springer Berlin Heidelberg

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