umu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Shear banding, discontinuous shear thickening, and rheological phase transitions in athermally sheared frictionless disks
Umeå University, Faculty of Science and Technology, Department of Physics.
2017 (English)In: Physical review. E, ISSN 2470-0045, E-ISSN 2470-0053, Vol. 95, no 5Article in journal (Refereed) Published
Abstract [en]

We report on numerical simulations of simple models of athermal, bidisperse, soft-core, massive disks in two dimensions, as a function of packing fraction phi, inelasticity of collisions as measured by a parameter Q, and applied uniform shear strain rate (gamma) over dot. Our particles have contact interactions consisting of normally directed elastic repulsion and viscous dissipation, as well as tangentially directed viscous dissipation, but no interparticle Coulombic friction. Mapping the phase diagram in the (phi, Q) plane for small (gamma) over dot, we find a sharp first-order rheological phase transition from a region with Bagnoldian rheology to a region with Newtonian rheology, and show that the system is always Newtonian at jamming. We consider the rotational motion of particles and demonstrate the crucial importance that the coupling between rotational and translational degrees of freedom has on the phase structure at small Q (strongly inelastic collisions). At small Q, we show that, upon increasing (gamma) over dot, the sharp Bagnoldian-to-Newtonian transition becomes a coexistence region of finite width in the (phi,(gamma) over dot) plane, with coexisting Bagnoldian and Newtonian shear bands. Crossing this coexistence region by increasing (gamma) over dot at fixed phi, we find that discontinuous shear thickening can result if (gamma) over dot is varied too rapidly for the system to relax to the shear-banded steady state corresponding to the instantaneous value of (gamma) over dot.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 95, no 5
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:umu:diva-136980ISI: 000402477200016OAI: oai:DiVA.org:umu-136980DiVA: diva2:1117831
Available from: 2017-06-29 Created: 2017-06-29 Last updated: 2017-06-30Bibliographically approved

Open Access in DiVA

fulltext(6641 kB)12 downloads
File information
File name FULLTEXT01.pdfFile size 6641 kBChecksum SHA-512
e3237a50c53f2d7756bd4d5a9668826881fd858c6066c39fe8f5430c95f19b6f191158d49fe0944ba6c6e626095f3cbc36043bf313d49b566c3a8f865bd429c3
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Olsson, Peter
By organisation
Department of Physics
In the same journal
Physical review. E
Other Physics Topics

Search outside of DiVA

GoogleGoogle Scholar
Total: 12 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 223 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf