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dc.contributor.authorZadeh, Aghil Abed
dc.contributor.authorBarés, Jonathan
dc.contributor.authorBehringer, Robert
dc.date.accessioned2018-06-05T20:59:18Z
dc.date.available2018-06-05T20:59:18Z
dc.date.issued2018-04-20
dc.identifier.urihttp://hdl.handle.net/1853/59996
dc.descriptionPresented 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.descriptionChairs: Volodymyr Korolovych & Blair Brettmann (Georgia Tech).en_US
dc.descriptionAghil Abed Zadeh, Jonathan Barés, and Robert Behringer is with Duke University.en_US
dc.descriptionRuntime: 11:33 minutesen_US
dc.description.abstractWe 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.sponsorshipGeorgia Institute of Technology. College of Sciencesen_US
dc.description.sponsorshipGeorgia Institute of Technology. Institute for Materialsen_US
dc.description.sponsorshipGeorgia Institute of Technology. Parker H. Petit Institute for Bioengineering and Bioscienceen_US
dc.description.sponsorshipGeorgia Institute of Technology. School of Materials Science and Engineeringen_US
dc.description.sponsorshipGeorgia Institute of Technology. School of Physicsen_US
dc.description.sponsorshipAmerican Physical Societyen_US
dc.description.sponsorshipExxon Mobil Corporationen_US
dc.description.sponsorshipNational Science Foundation (U.S.)en_US
dc.format.extent11:33 minutes
dc.language.isoen_USen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectAvalanchesen_US
dc.subjectGranular materialsen_US
dc.subjectParticlesen_US
dc.subjectPhotoelastic propertiesen_US
dc.subjectSoft matteren_US
dc.titleLocal and Global Avalanches in Sheared Granular Materialsen_US
dc.title.alternativeCrackling to Periodic Transition in Sheared Granular Materialsen_US
dc.typePresentationen_US
dc.typeVideoen_US
dc.contributor.corporatenameGeorgia Institute of Technology. Center for the Science and Technology of Advanced Materials and Interfacesen_US
dc.contributor.corporatenameDuke Universityen_US


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