Paper Number
SG1 

Session
Solids, Composites & Granular Materials

Title
Emergence and persistence of flow inhomogeneities in the yielding and fluidization of dense soft solids

Presentation Date and Time
October 17, 2018 (Wednesday) 9:50

Track / Room
Track 4 / Post Oak

Authors (Click on name to view author profile)

1. Vishwas, Vasisht (Universite Grenoble Alpes, Lyphy)
2. Roberts, Gabrielle (Yale University, Physics)
3. Del Gado, Emanuela (Georgetown University)

Author and Affiliation Lines (in printed abstract book)
Vasisht Vishwas¹, Gabrielle Roberts², and Emanuela Del Gado^3
1Lyphy, Universite Grenoble Alpes, Grenoble, France; ²Physics, Yale University, New Haven, CT; ³Georgetown University, Washington, DC

Speaker / Presenter 
Del Gado, Emanuela

Text of Abstract
The response to shear of dense soft solids features a stress overshoot and a persistent shear banding before reaching a homogeneously flowing state. In 3D large scale computer simulations of a model non-Brownian jammed suspension we analyze the time required for the onset of homogeneous flow, the normal stresses and the particle packing at different shear rates with and without confinement, finding that the stress overshoot and flow inhomogeneities are controlled by the presence of overconstrained microscopic domains in the initially solid samples. Being able to identify such domains in our model by prevalently icosahedrally packed regions, we show that they allow for stress accumulation during the stress overshoot and that their structural reorganization controls the emergence and the persistence of the shear banding.