Berlin 2015 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 45: Focus: Disordered Systems, Glasses under Shear I (joint session CPP/ DY)

DY 45.2: Vortrag

Donnerstag, 19. März 2015, 10:00–10:15, C 243

Shear cessation in a Brownian-dynamics simulation for 2D hard disks — •Sebastian Fritschi and Matthias Fuchs — Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany

We present results from a Brownian-dynamics computer simulation for the nonequilibrium transient dynamics in a colloidal glass former after the cessation of shear flow. In the glass, persistent residual stresses are found that depend on the flow history. The partial decay of stresses from the steady state to this residual stress is governed by the previous shear rate. Using a glassy hard-disk system, we also link this macroscale dynamics to microscopic particle motion, monitoring the transient mean-squared displacement measured during the relaxation from the steady state. A flow-induced second plateau is found in the mean-squared displacement at long times.