BPCPPDYSOE21 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 19: Statistical Physics 4 - organized by Barbara Drossel (Darmstadt), Sabine Klapp (Berlin) and Thomas Speck (Mainz)
DY 19.1: Vortrag
Dienstag, 23. März 2021, 09:00–09:20, DYb
Universal properties of creep flow — •Marko Popovic1,2, Tom de Geus1, Wencheng Ji1, Alberto Rosso3, and Matthieu Wyart1 — 1Institute of Physics, EPFL, Lausanne — 2MPI-PKS, Dresden — 3LPTMS, CNRS, Univ. Paris-Sud, Universite-Saclay, 91405 Orsay, France
Amorphous solids, such as atomic glasses, colloidal suspensions, granular matter or foams, begin to deform plastically when exposed to external stress Σ. Steady state flow of these materials in absence of thermal fluctuations is usually described as є ∼ (Σ − Σc)β for stresses above critical stress Σc and vanishes below. In presence of thermal fluctuations flow persists below Σc but is exponentially suppressed. The transient plastic deformation, called creep flow, is much less understood despite its importance in practical applications. Creep flow often displays a power-law decay in time є∼ t−µ after which it can either arrest or yield at fluidisation time τf. Recently, various numerical values and laws have been suggested for µ and τf in experimental or numerical studies. We propose that the creep flow parameters µ and τ can be expressed in terms of the steady state flow parameters, both in athermal and thermally activated systems. We successfully tested all our predictions using different mesoscopic elasto-plastic models of amorphous solids and found them to be consistent with published experimental results.