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

Abstract

The response to shear of the dense soft solids features a stress overshoot and a persistent shear banding before reaching a homogeneously flowing state. In 3D large scale simulations we analyze the time required for the onset of homogeneous flow, the normal stresses and structural signatures at different shear rates and in different flow geometries, finding that the stress overshoot, the shear band formation and its persistence 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.

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• Models for the yielding behaviour of amorphous solids
• Yielding, shear banding and brittle failure of amorphous materials
• Metastability as a mechanism for yielding in amorphous solids under cyclic shear
• Continuum modelling of shear start-up in soft glassy materials
• Flow heterogeneities in supercooled liquids and glasses under shear
• Avalanches and Structural Change in Cyclically Sheared Silica Glass
• Yielding transition of a two dimensional glass former under athermal cyclic shear deformation
• Correlation between plastic rearrangements and local structure in a cyclically driven glass
• Athermal creep deformation of ultrastable amorphous solids
• Precursors of fluidisation in the creep response of a soft glass
• Effect of adhesive interaction on strain stiffening and dissipation in granular gels undergoing yielding