Séminaire du LPTMS: Raffaela Cabriolu

Creep response of a soft glass

Raffaela Cabriolu (Department of Chemistry, Norwegian University of Science and Technology, Trondheim, Norway)

In this work we discuss finite size effects in the fluidization process of dense amorphous mate-
rials subjected to an external load. By means of molecular dynamics simulations we study the
mechanical response of a densly packed 3D particle system to a sudden applied shear stress. In
order to disentangle possible boundary effects from finite size effects, we use an unusual setup by
implementing a geometry-constraint protocol with periodic boundary conditions in all directions.
We show that this protocol is well controlled and that the long time fluidization process is to a
great extend independent of the details of the protocol parameters. This procedure allows for a
robust study of finite size effects regarding the creep exponents and the fluidization process. The
slow dynamics show a power-law creep with exponents that do not depend on the system size
whereas the fluidisation time shows strong finite size effects, that we can rationalize within a finite
size scaling relation.

 


Date/Time : 03/04/2018 - 11:00 - 11:30

Location : LPTMS, salle 201, 2ème étage, Bât 100, Campus d'Orsay

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