ELFT HÍRADÓ

[Janos Asboth <asboth AT phy.bme.hu>]

Meghívó

BME Elméleti Fizika Szeminárium,

december 11. péntek 10h15,
online a Microsoft Teams-ben
<https://teams.microsoft.com/l/meetup-join/19%3a2b2c8bd5ca294c90a1320cb5d16f7925%40thread.tacv2/1603102316945?context=%7b%22Tid%22%3a%226a3548ab-7570-4271-91a8-58da00697029%22%2c%22Oid%22%3a%22c7eaf7d2-684b-4597-b217-6a9121400219%22%7d>

Lévay Sára (BME Elm. Fiz. tanszék):

Interacting jammed granular systems

Sam Edwards more than 30 years ago proposed a model to describe the
statistics of granular packings by an ensemble of equiprobable jammed
states. Experimental tests of this model remained scarce so far. We
introduce a simple system to analyse statistical properties of jammed
granular ensembles to test Edwards' theory [1]. Identical spheres packed in
a nearly two-dimensional geometrical confinement were studied in
experiments and numerical simulations. When tapped, it evolves towards a
ground state, but due to incompatible domain structures it gets trapped.
Analytical calculations reproduce relatively well our simulation results,
which allows us to test Edwards' theory on a coupled system of two
subsystems with different properties. We find that the joint system can
only be described by a common compactivity if the stress equilibrium is
also taken into account. The results show some counterintuitive effects, as
the side with less free volume compactifies.

[1]: S. Levay et al,  arXiv:2007.04789

Minden érdeklődőt szeretettel várunk.

Asbóth János
szemináriumi koordinátor