Shear Thickening and Jamming of Dense Suspensions: The "Roll" of Friction
Abstract
Particle-based simulations of discontinuous shear thickening (DST) and shear jamming (SJ) suspensions are used to study the role of stress-activated constraints, with an emphasis on resistance to gearlike rolling. Rolling friction decreases the volume fraction required for DST and SJ, in quantitative agreement with real-life suspensions with adhesive surface chemistries and "rough" particle shapes. It sets a distinct structure of the frictional force network compared to only sliding friction, and from a dynamical perspective leads to an increase in the velocity correlation length, in part responsible for the increased viscosity. The physics of rolling friction is thus a key element in achieving a comprehensive understanding of strongly shear-thickening materials.
- Publication:
-
Physical Review Letters
- Pub Date:
- June 2020
- DOI:
- 10.1103/PhysRevLett.124.248005
- arXiv:
- arXiv:2002.10996
- Bibcode:
- 2020PhRvL.124x8005S
- Keywords:
-
- Condensed Matter - Soft Condensed Matter;
- Physics - Fluid Dynamics
- E-Print:
- 5 pages, 4 figures. +Supplemental Material--- --- Supplementary Material also consists of the following movies: ---https://youtu.be/wgrfN7jiu1g (Force network in 3D at volume fraction 0.45, at high stress limit, with and without rolling friction) --- https://youtu.be/SMzTB7CsRsY (Force network in 2D at packing fraction 0.7, at high stress limit, with and without rolling friction)