Ref HAL: hal-00715444_v1
Ref Arxiv: 1203.0825
DOI: 10.1103/PhysRevLett.109.018301
WoS: 000306323400007
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
192 Citations
Résumé:

We explore numerically the shear rheology of soft repulsive particles at large volume fraction. The interplay between viscous dissipation and thermal motion results in multiple rheological regimes encompassing Newtonian, shear-thinning and yield stress regimes near the 'colloidal' glass transition when thermal fluctuations are important, crossing over to qualitatively similar regimes near the 'jamming' transition when dissipation dominates. In the crossover regime, glass and jamming sectors coexist and give complex flow curves. Although glass and jamming limits are characterized by similar macroscopic flow curves, we show that they occur over distinct time and stress scales and correspond to distinct microscopic dynamics. We propose a simple rheological model describing the glass to jamming crossover in the flow curves, and discuss the experimental implications of our results.

Commentaires: 5 pages, 3 figs