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Creep and flow of glasses: strain response linked to the spatial distribution of
dynamical heterogeneities
#MMPMID26153523
Sentjabrskaja T
; Chaudhuri P
; Hermes M
; Poon WC
; Horbach J
; Egelhaaf SU
; Laurati M
Sci Rep
2015[Jul]; 5
(?): 11884
PMID26153523
show ga
Mechanical properties are of central importance to materials sciences, in
particular if they depend on external stimuli. Here we investigate the
rheological response of amorphous solids, namely colloidal glasses, to external
forces. Using confocal microscopy and computer simulations, we establish a
quantitative link between the macroscopic creep response and the microscopic
single-particle dynamics. We observe dynamical heterogeneities, namely regions of
enhanced mobility, which remain localized in the creep regime, but grow for
applied stresses leading to steady flow. These different behaviors are also
reflected in the average particle dynamics, quantified by the mean squared
displacement of the individual particles, and the fraction of active regions.
Both microscopic quantities are found to be proportional to the macroscopic
strain, despite the non-equilibrium and non-linear conditions during creep and
the transient regime prior to steady flow.
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