Dresden 2020 – wissenschaftliches Programm
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DY 13.1: Hauptvortrag
Montag, 16. März 2020, 15:00–15:30, ZEU 118
Shearing of glasses: new insight from studying model glasses of different system sizes — •Andreas Heuer, Markus Blank-Burian, Lawrence Smith, and Moumita Maiti — Inst. Phys. Chemie, WWU Muenster, Germany
Upon shearing of glasses a large variety of different phenomena can be observed. This includes, e.g., the stress overshoot and the emergence of shear bands. Many properties have been related to the presence of shear transformation zones (STZs).
In previous work on quiescent glasses important information about the physical mechanisms could be extracted from studying the dependence of dynamical properties on the system size. Here it was essential to study system sizes between approx. 60 and a few thousand . Furthermore, an appropriate discretization of the dynamics in terms of metabasins was essential.
Here we study the properties of sheared systems in an analogous setting. Formally, shearing corresponds to a time-dependent energy landscape, requiring a generalization of the metabasin concept . Interestingly, when studying the size dependence upon shearing at low temperatures, it turns out that macroscopically relevant behavior starts to be observed for system sizes above (approx.) 10.000. Important properties of the dynamic heterogeneities as reflected, e.g., by the emergence of shear bands, is extracted from these dependencies and related to the STZs.
 C. Rehwald, A. Heuer, Phys. Rev. E, 86, 051504 (2012).  M. Blank-Burian. A. Heuer, Phys. Rev. E 98, 033002 (2018).