Influence of boundary conditions on yielding in a soft glassy material

Details Influence of boundary conditions on yielding in a soft glassy material Influence of boundary conditions on yielding in a soft glassy material

2008-07-21

arxiv.org/abs/0807.3274v2

Physical Review Letters 25, 101 (2008) 258302

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.101.258302

The yielding behavior of a sheared Laponite suspension is investigated within a 1 mm gap under two different boundary conditions. No-slip conditions, ensured by using rough walls, lead to shear localization as already reported in various soft glassy materials. When apparent wall slip is allowed using a smooth geometry, the sample is shown to break up into macroscopic solid pieces that get slowly eroded by the surrounding fluidized material up to the point where the whole sample is fluid. Such a drastic effect of boundary conditions on yielding suggests the existence of some macroscopic characteristic length that could be connected to cooperativity effects in jammed materials under shear.

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