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Modeling the relaxation of polymer glasses under shear and elongational loads (2013)
Journal Article
Fielding, S., Moorcroft, R., Larson, R., & Cates, M. (2013). Modeling the relaxation of polymer glasses under shear and elongational loads. The Journal of Chemical Physics, 138(12), Article 12A504. https://doi.org/10.1063/1.4769253

Glassy polymers show 'strain hardening': at constant extensional load, their flow first accelerates, then arrests. Recent experiments under such loading have found this to be accompanied by a striking dip in the segmental relaxation time. This can be... Read More about Modeling the relaxation of polymer glasses under shear and elongational loads.

Criteria for Shear Banding in Time-Dependent Flows of Complex Fluids (2013)
Journal Article
Moorcroft, R., & Fielding, S. (2013). Criteria for Shear Banding in Time-Dependent Flows of Complex Fluids. Physical Review Letters, 110(8), Article 086001. https://doi.org/10.1103/physrevlett.110.086001

We study theoretically the onset of shear banding in the three most common time-dependent rheological protocols: step stress, finite strain ramp (a limit of which gives a step strain), and shear startup. By means of a linear stability analysis we pro... Read More about Criteria for Shear Banding in Time-Dependent Flows of Complex Fluids.

Simple Model for the Deformation-Induced Relaxation of Glassy Polymers (2012)
Journal Article
Fielding, S., Larson, R., & Cates, M. (2012). Simple Model for the Deformation-Induced Relaxation of Glassy Polymers. Physical Review Letters, 108(4), Article 048301. https://doi.org/10.1103/physrevlett.108.048301

Glassy polymers show “strain hardening”: at constant extensional load, their flow first accelerates, then arrests. Recent experiments have found this to be accompanied by a striking and unexplained dip in the segmental relaxation time. Here we explai... Read More about Simple Model for the Deformation-Induced Relaxation of Glassy Polymers.

Interfacially driven instability in the microchannel flow of a shear-banding fluid (2010)
Journal Article
Nghe, P., Fielding, S., Tabeling, P., & Ajdari, A. (2010). Interfacially driven instability in the microchannel flow of a shear-banding fluid. Physical Review Letters, 104(24), Article 248303. https://doi.org/10.1103/physrevlett.104.248303

Using microparticle image velocimetry, we resolve the spatial structure of the shear-banding flow of a wormlike micellar surfactant solution in a straight microchannel. We reveal an instability of the interface between the shear bands, associated wit... Read More about Interfacially driven instability in the microchannel flow of a shear-banding fluid.

Viscoelastic Taylor-Couette instability of shear banded flow (2010)
Journal Article
Fielding, S. (2010). Viscoelastic Taylor-Couette instability of shear banded flow. Physical Review Letters, 104(19), Article 198303. https://doi.org/10.1103/physrevlett.104.198303

We study numerically shear banded flow in planar and curved Couette geometries. Our aim is to capture two recent observations in shear banding systems of roll cells stacked in the vorticity direction, associated with an undulation of the interface be... Read More about Viscoelastic Taylor-Couette instability of shear banded flow.