Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.055502
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Funding
- EPSRC [EP/E5336X/2, EP/E030173]
- Royal Society
- Engineering and Physical Sciences Research Council [EP/E030173/1, EP/E05336X/2] Funding Source: researchfish
- EPSRC [EP/E030173/1, EP/E05336X/2] Funding Source: UKRI
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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.
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