Abstract : 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.
https://hal-ens-lyon.archives-ouvertes.fr/ensl-00303121
Contributeur : Sébastien Manneville
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Soumis le : mardi 6 janvier 2009 - 09:37:51
Dernière modification le : jeudi 19 avril 2018 - 14:54:03
Document(s) archivé(s) le : mercredi 22 septembre 2010 - 10:56:15
Thomas Gibaud, Catherine Barentin, Sébastien Manneville. Influence of boundary conditions on yielding in a soft glassy material. Physical Review Letters, American Physical Society, 2008, 101 (25), pp.258302. 〈ensl-00303121v2〉
