Connecting thermal relaxation to local yield stress in glassy systems

ORAL

Abstract

We study a binary Lennard-Jones mixture in the supercooled regime using molecular dynamic simulations. At low temperatures, thermal relaxation proceeds in a series of activated jumps between inherent structures, i.e. local minima of the potential energy landscape. From these inherent dynamics we recover information about the location of thermally activated rearrangements. We observe a strong connection between the thermal relaxation and areas where the structure has been previously identified as being soft using a local, direct probing of shear stress thresholds. Using the probability distribution of local shear stresses we are able to capture features of the system's dynamical relaxation processes. We thus can establish a link between structural and dynamical properties of the supercooled liquid. Furthermore, we extend our analysis to out of equilibrium dynamics by studying the effects of rejuvenation and aging on the local yield stress distribution in both glasses and liquids at different temperatures.

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Presenters

  • Matthias Lerbinger

    PMMH, ESPCI Paris, PMMH, CNRS UMR 7636, ESPCI Paris, PSL University, Sorbonne Université, Université de Paris, F-75005 Paris, France

Authors

  • Matthias Lerbinger

    PMMH, ESPCI Paris, PMMH, CNRS UMR 7636, ESPCI Paris, PSL University, Sorbonne Université, Université de Paris, F-75005 Paris, France

  • Armand Barbot

    PMMH, ESPCI Paris, PMMH, CNRS UMR 7636, ESPCI Paris, PSL University, Sorbonne Université, Université de Paris, F-75005 Paris, France

  • Sylvain Patinet

    PMMH, ESPCI Paris, Physique de Mécanique des Milieux Hétérogènes laboratory, PMMH, CNRS UMR 7636, ESPCI Paris, PSL University, Sorbonne Université, Université de Paris, F-75005 Paris, France, espci Paris

  • Damien Vandembroucq

    PMMH, ESPCI Paris, PMMH, CNRS UMR 7636, ESPCI Paris, PSL University, Sorbonne Université, Université de Paris, F-75005 Paris, France, espci Paris