Local and Global Avalanches in Sheared Granular Materials

Zadeh, Aghil Abed; Barés, Jonathan; Behringer, Robert

Title:

Local and Global Avalanches in Sheared Granular Materials

dc.contributor.author	Zadeh, Aghil Abed
dc.contributor.author	Barés, Jonathan
dc.contributor.author	Behringer, Robert
dc.contributor.corporatename	Georgia Institute of Technology. Center for the Science and Technology of Advanced Materials and Interfaces	en_US
dc.contributor.corporatename	Duke University	en_US
dc.date.accessioned	2018-06-05T20:59:18Z
dc.date.available	2018-06-05T20:59:18Z
dc.date.issued	2018-04-20
dc.description	Presented at the Symposium on Soft Matter Forefronts "Contributed Talks", April 20, 2018, from 11:10 a.m.-12:00 p.m. in the Student Center Ballroom, Georgia Tech.	en_US
dc.description	Chairs: Volodymyr Korolovych & Blair Brettmann (Georgia Tech).	en_US
dc.description	Aghil Abed Zadeh, Jonathan Barés, and Robert Behringer is with Duke University.	en_US
dc.description	Runtime: 11:33 minutes	en_US
dc.description.abstract	We perform a stick-slip experiment to characterize avalanches for granular materials. In our experiment, a constant speed stage pulls a slider which rests on a vertical bed of circular photoelastic particles in a 2D system. The stage is connected to the slider by a spring. We measure the force on the spring by a force sensor attached to the spring. We study the PDF of energy release and slip size, avalanche shape in time, and other seismicity laws during slip avalanches. We analyze the power spectrum of the force signal and probability distributions to understand the effect of the loading speed and of the spring stiffness on the statistical behavior of the system. From a more local point of view and by using a high speed camera and the photoelastic properties of our particles, we characterize the local stress change and flow of particles during avalanches. By image processing we detect the avalanches, as connected components in space and time, and the energy dissipation inside the granular medium and their PDFs. The PDFs of avalanches obey power laws both at global and local scales, but with different exponents. We try to understand the distribution and correlation of local avalanches in space and the way they coarse grain to the global avalanches.	en_US
dc.description.sponsorship	Georgia Institute of Technology. College of Sciences	en_US
dc.description.sponsorship	Georgia Institute of Technology. Institute for Materials	en_US
dc.description.sponsorship	Georgia Institute of Technology. Parker H. Petit Institute for Bioengineering and Bioscience	en_US
dc.description.sponsorship	Georgia Institute of Technology. School of Materials Science and Engineering	en_US
dc.description.sponsorship	Georgia Institute of Technology. School of Physics	en_US
dc.description.sponsorship	American Physical Society	en_US
dc.description.sponsorship	Exxon Mobil Corporation	en_US
dc.description.sponsorship	National Science Foundation (U.S.)	en_US
dc.format.extent	11:33 minutes
dc.identifier.uri	http://hdl.handle.net/1853/59996
dc.language.iso	en_US	en_US
dc.publisher	Georgia Institute of Technology	en_US
dc.subject	Avalanches	en_US
dc.subject	Granular materials	en_US
dc.subject	Particles	en_US
dc.subject	Photoelastic properties	en_US
dc.subject	Soft matter	en_US
dc.title	Local and Global Avalanches in Sheared Granular Materials	en_US
dc.title.alternative	Crackling to Periodic Transition in Sheared Granular Materials	en_US
dc.type	Moving Image
dc.type.genre	Lecture
dspace.entity.type	Publication
local.contributor.corporatename	Soft Matter Incubator
local.contributor.corporatename	Center for the Science and Technology of Advanced Materials and Interfaces
relation.isOrgUnitOfPublication	95867400-60a4-4b13-be33-8c9ea9434266
relation.isOrgUnitOfPublication	a21b130a-9b72-4c0c-b82d-22f981aa1d12