BPCPPDYSOE21 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Glasses and Glass Transition 1 (joint session DY/CPP)

CPP 19.3: Vortrag

Mittwoch, 24. März 2021, 10:10–10:30, DYc

A new approach to probe the plastic rearrangements inside a shear band. — •Moumita Maiti and Andreas Heuer — University of Münster, Münster, Germany

We follow a single particle trajectory of a system subjected to a uniform shear by calculating it's instantaneous displacement with time. There are intermittent hops in the trajectory, which are treated as plastic events, and the particles which have performed hops, are called active. In the steady state, the number of events per particle of the whole system increases initially by increasing system size, and by further increment the number almost saturates. The onset of saturation is the onset of shear banding. Interestingly, above the onset, we observe a system size scaling in the number of plastic events only inside the shear band. The scaling is explained from the intervals between two consecutive hops of a particle, which decreases on an average with increasing size. We further show that there is a stronger coupling between active particles with increasing system size which helps to understand the smaller value of the intervals, so our approach captures the collective nature of plastic events. Additionally, we observe a system spanning avalanches for these sizes which exhibit shear banding, and the distribution of avalanche sizes have a different exponent from the mean field theory.