Berlin 2015 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 61: Focus: Disordered Systems, Glasses under Shear I (joint session CPP, DY)
CPP 61.10: Vortrag
Donnerstag, 19. März 2015, 12:30–12:45, C 243
Shear bands in a model glass former — •Gaurav Prakash Shrivastav1, Pinaki Chaudhuri2, and Jürgen Horbach1 — 1Institut für Theoretische Physik II - Soft Matter, Heinrich-Heine-Universität Düsseldorf, Germany — 2The Institute of Mathematical Sciences, Chennai, India
We study the mechanical response of a binary Lennard-Jones mixture by shearing it below the glass transition temperature with a constant strain rate. The onset of flow is associated with an inhomogeneous flow pattern [1,2]. Highly mobile regions form a long-lived shear-band-like structure. Although the flow curve is monotonic and stress-strain response does not show any signature of a shear band, this heterogeneity is captured very well in the mean square displacement of particles. The width of the shear band grows diffusively with time. We find that shear bands are more pronounced in the cuboid boxes than in the cubic boxes. This can be explained by the quadrupolar structure of the local strain fields. To investigate the origin of shear bands we identify the local events that lead to their formation. We observe that these initial active spots are localized to one or two particles.
[1] P. Chaudhuri, J. Horbach, Phys. Rev. E 88, 040301(R) (2013).
[2] P. Chaudhuri, J. Horbach, Phys. Rev. E 90, 040301(R) (2014).