Age-Dependent Transient Shear Banding in Soft Glasses

Robyn L. Moorcroft, Michael E. Cates, Suzanne M. Fielding

Research output: Contribution to journalArticlepeer-review

Abstract

We study numerically the formation of long-lived transient shear bands during shear startup within two models of soft glasses (a simple fluidity model and an adapted "soft glassy rheology" model). The degree and duration of banding depends strongly on the applied shear rate, and on sample age before shearing. In both models the ultimate steady flow state is homogeneous at all shear rates, consistent with the underlying constitutive curve being monotonic. However, particularly in the soft glassy rheology case, the transient bands can be extremely long lived. The banding instability is neither "purely viscous" nor "purely elastic" in origin, but is closely associated with stress overshoot in startup flow.

Original languageEnglish
Article number055502
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Volume106
Issue number5
DOIs
Publication statusPublished - 2 Feb 2011

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