Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Glasses and Glass Transition (joint session CPP/DY)

CPP 16.3: Vortrag

Montag, 1. April 2019, 16:45–17:00, H8

System size-dependent non-affine displacements in a model glass: the impact of yield strain — •Moumita Maiti and Andreas Heuer — University of Muenster, Institute for physical chemistry, Corrensstr. 28/30, 48149, Muenster

The probability distribution of non-affine displacements has an exponential tail, which is scaled with the system size. The scaling exponent is zero for all strains below a critical value which turns out surprisingly to be the overshoot strain. Above, the scaling exponent is finite. This picture holds for the system size larger than approx. 4000 particles. For small system size we find that the scaling exponent is finite and constant irrespective of any strain value. In order to understand these two pictures we calculate the mobility correlation of nearest neighbours. Around the mobility range where percolation of mobile particles takes place, the correlation increases again up to sizes of approx. 4000 particles and saturates above that size. This yields additional insight into the physical mechanisms of yielding.