The build-up and relaxation of stresses in a glass-forming soft-sphere mixture under shear: A computer simulation studyJ. Zausch1 and J. Horbach2
1 Institut für Physik, Johannes Gutenberg-Universität Mainz - Staudinger Weg 7, D-55099 Mainz, Germany, EU
2 Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR) 51170 Köln, Germany, EU
received 4 November 2009; accepted in final form 27 November 2009; published December 2009
published online 17 December 2009
Molecular-dynamics computer simulations in conjunction with Lees-Edwards boundary conditions are used to investigate a glass-forming binary Yukawa fluid under shear. The transition from the elastic response to plastic flow is elucidated by studying the stress relaxation after switching off the shear. We find a slow stress relaxation starting from states in the elastic regime and a fast one starting from states in the plastic-flow regime. We show that these relaxation patterns are related to a different distribution of local microscopic stresses in both cases.
05.70.Ln - Nonequilibrium and irreversible thermodynamics.
47.50.Cd - Non-Newtonian fluid flows: Modeling.
83.60.Rs - Shear rate-dependent structure (shear thinning and shear thickening).
© EPLA 2009