1211.6964 (Fabian Frahsa et al.)

On the Bauschinger effect in supercoooled melts under shear: results
from mode coupling theory and molecular dynamics simulations    [PDF]

Fabian Frahsa, Amit Kumar Bhattacharjee, Jürgen Horbach, Matthias Fuchs, Thomas Voigtmann

We study the nonlinear rheology of a glass-forming binary mixture under the reversal of shear flow using molecular dynamics simulations and a schematic model of the mode-coupling theory of the glass transition (MCT). Memory effects lead to a history-dependent response, as exemplified by the vanishing of a stress-overshoot phenomenon in the stress--strain curves of the sheared liquid, and a change in the apparent elastic coefficients around states with zero stress. We investigate the various retarded contributions to the stress response at a given time schematically within MCT. The connection of this macroscopic response to single-particle motion is demonstrated using molecular-dynamics simulation.

View original: http://arxiv.org/abs/1211.6964