Regensburg 2016 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 50: Glasses
DY 50.9: Vortrag
Donnerstag, 10. März 2016, 12:00–12:15, H48
Residual stresses in glass forming systems — •Gaurav Prakash Shrivastav1, Pinaki Chaudhuri2, and Jürgen Horbach1 — 1Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany — 2The institute of Mathematical Sciences, Chennai, India
When a sheared glass is allowed to relax, stress does not decay to zero but tends towards a finite value. How the resulting residual stress is spatially distributed in the system is only poorly understood, especially in the case of a sheared system with shear bands. Also, the effect of different shear rates, with which the initial glass is deformed, and the effect of the amount of strain present in the initial deformed glass on the residual stress distribution are open issues.
In the present work, we study, using molecular dynamics simulations, relaxation of stresses in a sheared model glass former. We first deform a binary glass forming Lennard-Jones mixture by shearing it with a constant strain rate. Then, we switch of the shear in different regimes of the stress-strain curve and allow the system to relax. We find that the amount of residual stress in the system depends on the initial strain before the shear cessation. By looking at the spatially resolved mean square displacement of particles, we find that the residual stress remains localized in regions where the shear band has been present before. We also find that the deformed glass has higher Poisson's ratio than the undeformed glass, consistent with previous observations.
References
[1] I Binkowski, G. P. Shrivastav, J. Horbach, S. V. Divinski, G. Wilde arXiv:1506.03031 (2015).