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DY: Fachverband Dynamik und Statistische Physik
DY 10: Posters I
DY 10.11: Poster
Montag, 14. März 2011, 17:00–19:00, P4
Non-linear single-particle-response of glassforming systems to external fields — •David Winter1, Jürgen Horbach2, Peter Virnau1, and Kurt Binder1 — 1Johannes Gutenberg-Universität, Mainz, Germany — 2Deutsches Zentrum für Luft und Raumfahrt (DLR), Köln, Germany
Non-equilibrium molecular dynamics (NEMD) computer simulation are used to study the nonlinear response of single particles to external fields in glass-forming soft-sphere mixtures. Individual particles are pulled through the system by applying a constant force. If the force is strong enough, structural rearrangements as well as flow or plastic deformation in the host liquid or glass around the pulled particle will be induced. Force-velocity relations are compared to shear rate-stress relations from NEMD simulations where the non-linear response to macroscopic shear fields is probed. This allows to reveal to what extent the single-particle response to an external force probes the macro-rheological properties of a glass-forming system under shear.