SKM 2023 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 27: Statistical Physics: Far From Equilibrium I
DY 27.6: Vortrag
Mittwoch, 29. März 2023, 11:00–11:15, ZEU 250
Metastability as a Mechanism for Yielding in Amorphous Solids under Cyclic Shear — •Muhittin Mungan1 and Srikanth Sastry2 — 1Institute of Biological Physics, University of Cologne, Cologne, Germany — 2Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru, India
We consider the yielding behavior of amorphous solids under cyclic shear deformation and show that it can be mapped into a random walk in a confining potential with an absorbing boundary. The resulting dynamics is governed by the first passage time into the absorbing state and suffices to capture the essential qualitative features recently observed in atomistic simulations of amorphous solids. Our results provide insight into the mechanism underlying yielding and its robustness. When the possibility of activated escape from absorbing states is added, it leads to a unique determination of a threshold energy and yield strain, suggesting thereby an appealing approach to understanding fatigue failure [1].
[1] M. Mungan and S. Sastry, Phys. Rev. Lett. 127 (2021) 248002