Age-dependent transient shear banding in soft glasses

Details Age-dependent transient shear banding in soft glasses Age-dependent transient shear banding in soft glasses

2010-11-18

arxiv.org/abs/1011.4221v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures

Scientific paper

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 SGR 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.

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