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Reduced stress propagation leads to increased mechanical failure resistance in auxetic materials (2024)
Journal Article
Fielding, S. M. (2024). Reduced stress propagation leads to increased mechanical failure resistance in auxetic materials. Proceedings of the National Academy of Sciences, 121(21), Article e2312899121. https://doi.org/10.1073/pnas.2312899121

Materials with a negative Poisson ratio have the counterintuitive property of expanding laterally when they are stretched longitudinally. They are accordingly termed auxetic, from the Greek auxesis meaning to increase. Experimental studies have demon... Read More about Reduced stress propagation leads to increased mechanical failure resistance in auxetic materials.

Slow Fatigue and Highly Delayed Yielding via Shear Banding in Oscillatory Shear (2024)
Journal Article
Cochran, J. O., Callaghan, G. L., Caven, M. J., & Fielding, S. M. (2024). Slow Fatigue and Highly Delayed Yielding via Shear Banding in Oscillatory Shear. Physical Review Letters, 132(16), Article 168202. https://doi.org/10.1103/PhysRevLett.132.168202

We study theoretically the dynamical process of yielding in cyclically sheared amorphous materials, within a thermal elastoplastic model and the soft glassy rheology model. Within both models we find an initially slow accumulation, over many cycles a... Read More about Slow Fatigue and Highly Delayed Yielding via Shear Banding in Oscillatory Shear.

Power law creep and delayed failure of gels and fibrous materials under stress (2024)
Journal Article
Lockwood, H. A., Agar, M. H., & Fielding, S. M. (2024). Power law creep and delayed failure of gels and fibrous materials under stress. Soft Matter, 20(11), 2474-2479. https://doi.org/10.1039/d3sm01608k

Motivated by recent experiments studying the creep and breakup of a protein gel under stress, we introduce a simple mesoscopic model for the irreversible failure of gels and fibrous materials, and demonstrate it to capture much of the phenomenology s... Read More about Power law creep and delayed failure of gels and fibrous materials under stress.

Discontinuous Shear Thickening in Biological Tissue Rheology (2024)
Journal Article
Hertaeg, M. J., Fielding, S. M., & Bi, D. (2024). Discontinuous Shear Thickening in Biological Tissue Rheology. Physical Review X, 14(1), Article 011027. https://doi.org/10.1103/physrevx.14.011027

During embryonic morphogenesis, tissues undergo dramatic deformations in order to form functional organs. Similarly, in adult animals, living cells and tissues are continually subjected to forces and deformations. Therefore, the success of embryonic... Read More about Discontinuous Shear Thickening in Biological Tissue Rheology.

Constitutive model for the rheology of biological tissue (2023)
Journal Article
Fielding, S. M., Cochran, J. O., Huang, J., Bi, D., & Marchetti, M. C. (2023). Constitutive model for the rheology of biological tissue. Physical Review E, 108(4), Article L042602. https://doi.org/10.1103/PhysRevE.108.L042602

The rheology of biological tissue is key to processes such as embryo development, wound healing, and cancer metastasis. Vertex models of confluent tissue monolayers have uncovered a spontaneous liquid-solid transition tuned by cell shape; and a shear... Read More about Constitutive model for the rheology of biological tissue.

Model of Friction with Plastic Contact Nudging: Amontons-Coulomb Laws, Aging of Static Friction, and Nonmonotonic Stribeck Curves with Finite Quasistatic Limit (2023)
Journal Article
Fielding, S. M. (2023). Model of Friction with Plastic Contact Nudging: Amontons-Coulomb Laws, Aging of Static Friction, and Nonmonotonic Stribeck Curves with Finite Quasistatic Limit. Physical Review Letters, 130(17), Article 178203. https://doi.org/10.1103/physrevlett.130.178203

We introduce a model of friction between two contacting (stationary or cosliding) rough surfaces, each comprising a random ensemble of polydisperse hemispherical bumps. In the simplest version of the model, the bumps experience on contact with each o... Read More about Model of Friction with Plastic Contact Nudging: Amontons-Coulomb Laws, Aging of Static Friction, and Nonmonotonic Stribeck Curves with Finite Quasistatic Limit.

Yielding, shear banding, and brittle failure of amorphous materials (2022)
Journal Article
Pollard, J., & Fielding, S. M. (2022). Yielding, shear banding, and brittle failure of amorphous materials. Physical Review Research, 4(4), Article 043037. https://doi.org/10.1103/physrevresearch.4.043037

Widespread processes in nature and technology are governed by the dynamical transition whereby a material in an initially solid-like state, whether soft or hard, then yields. Major unresolved questions concern whether any material will yield smoothly... Read More about Yielding, shear banding, and brittle failure of amorphous materials.

Perspectives on viscoelastic flow instabilities and elastic turbulence (2022)
Journal Article
Datta, S. S., Ardekani, A. M., Arratia, P. E., Beris, A. N., Bischofberger, I., McKinley, G. H., …Stone, H. A. (2022). Perspectives on viscoelastic flow instabilities and elastic turbulence. Physical Review Fluids, 7(8), Article 080701. https://doi.org/10.1103/physrevfluids.7.080701

Viscoelastic fluids are a common subclass of rheologically complex materials that are encountered in diverse fields from biology to polymer processing. Often the flows of viscoelastic fluids are unstable in situations where ordinary Newtonian fluids... Read More about Perspectives on viscoelastic flow instabilities and elastic turbulence.

Power fluctuations in sheared amorphous materials: A minimal model (2022)
Journal Article
Ekeh, T., Fodor, É., Fielding, S. M., & Cates, M. E. (2022). Power fluctuations in sheared amorphous materials: A minimal model. Physical Review E, 105(5), Article L052601. https://doi.org/10.1103/physreve.105.l052601

The importance of mesoscale fluctuations in flowing amorphous materials is widely accepted, without a clear understanding of their role. We propose a mean-field elastoplastic model that admits both stress and strain-rate fluctuations, and investigate... Read More about Power fluctuations in sheared amorphous materials: A minimal model.

Shear-Driven Solidification and Nonlinear Elasticity in Epithelial Tissues (2022)
Journal Article
Huang, J., Cochran, J. O., Fielding, S. M., Marchetti, M. C., & Bi, D. (2022). Shear-Driven Solidification and Nonlinear Elasticity in Epithelial Tissues. Physical Review Letters, 128(17), https://doi.org/10.1103/physrevlett.128.178001

Biological processes, from morphogenesis to tumor invasion, spontaneously generate shear stresses inside living tissue. The mechanisms that govern the transmission of mechanical forces in epithelia and the collective response of the tissue to bulk sh... Read More about Shear-Driven Solidification and Nonlinear Elasticity in Epithelial Tissues.

Wall slip and bulk yielding in soft particle suspensions (2021)
Journal Article
Jung, G., & Fielding, S. M. (2021). Wall slip and bulk yielding in soft particle suspensions. Journal of Rheology, 65(2), Article 199. https://doi.org/10.1122/8.0000171

We simulate a dense athermal suspension of soft particles sheared between hard walls of a prescribed roughness profile, fully accounting for the fluid mechanics of the solvent between the particles and for the solid mechanics of changes in the partic... Read More about Wall slip and bulk yielding in soft particle suspensions.

Aging in a mean field elastoplastic model of amorphous solids (2020)
Journal Article
Parley, J. T., Fielding, S. M., & Sollich, P. (2020). Aging in a mean field elastoplastic model of amorphous solids. Physics of Fluids, 32(12), Article 127104. https://doi.org/10.1063/5.0033196

We construct a mean-field elastoplastic description of the dynamics of amorphous solids under arbitrary time-dependent perturbations, building on the work of Lin and Wyart [Phys. Rev. X 6, 011005 (2016)] for steady shear. Local stresses are driven by... Read More about Aging in a mean field elastoplastic model of amorphous solids.

Ductile and Brittle Yielding in Thermal and Athermal Amorphous Materials (2020)
Journal Article
Barlow, H. J., Cochran, J. O., & Fielding, S. M. (2020). Ductile and Brittle Yielding in Thermal and Athermal Amorphous Materials. Physical Review Letters, 125(16), Article 168003. https://doi.org/10.1103/physrevlett.125.168003

We study theoretically the yielding of sheared amorphous materials as a function of increasing levels of initial sample annealing prior to shear, in three widely used constitutive models and three widely studied annealing protocols. In thermal system... Read More about Ductile and Brittle Yielding in Thermal and Athermal Amorphous Materials.

Interplay of edge fracture and shear banding in complex fluids (2020)
Journal Article
Hemingway, E. J., & Fielding, S. M. (2020). Interplay of edge fracture and shear banding in complex fluids. Journal of Rheology, 64(5), Article 1147. https://doi.org/10.1122/8.0000086

We explore theoretically the interplay between shear banding and edge fracture in complex fluids by performing a detailed simulation study within two constitutive models: the Johnson–Segalman model and the Giesekus model. We consider separately param... Read More about Interplay of edge fracture and shear banding in complex fluids.

Elastoviscoplastic rheology and aging in a simplified soft glassy constitutive model (2020)
Journal Article
Fielding, S. M. (2020). Elastoviscoplastic rheology and aging in a simplified soft glassy constitutive model. Journal of Rheology, 64(3), Article 723. https://doi.org/10.1122/1.5140465

Yield stress fluids display a rich rheological phenomenology. Beyond the defining existence of a yield stress in the steady state flow curve, this includes, in many materials, rather flat viscoelastic spectra over many decades of frequency in small a... Read More about Elastoviscoplastic rheology and aging in a simplified soft glassy constitutive model.

Slow Coarsening in Jammed Athermal Soft Particle Suspensions (2019)
Journal Article
Chacko, R., Sollich, P., & Fielding, S. (2019). Slow Coarsening in Jammed Athermal Soft Particle Suspensions. Physical Review Letters, 123(10), Article 108001. https://doi.org/10.1103/physrevlett.123.108001

We simulate a densely jammed, athermal assembly of repulsive soft particles immersed in a solvent. Starting from an initial condition corresponding to a quench from a high temperature, we find nontrivial slow dynamics driven by a gradual release of s... Read More about Slow Coarsening in Jammed Athermal Soft Particle Suspensions.

Edge fracture instability in sheared complex fluids: Onset criterion and possible mitigation strategy (2019)
Journal Article
Hemingway, E. J., & Fielding, S. M. (2019). Edge fracture instability in sheared complex fluids: Onset criterion and possible mitigation strategy. Journal of Rheology, 63(5), https://doi.org/10.1122/1.5095717

We perform a detailed theoretical study of the edge fracture instability, which commonly destabilizes the fluid-air interface during strong shear flows of entangled polymeric fluids, leading to unreliable rheological measurements. By means of direct... Read More about Edge fracture instability in sheared complex fluids: Onset criterion and possible mitigation strategy.

Linear instability of shear thinning pressure driven channel flow (2019)
Journal Article
Barlow, H., Hemingway, E., Clarke, A., & Fielding, S. (2019). Linear instability of shear thinning pressure driven channel flow. Journal of Non-Newtonian Fluid Mechanics, 270, 66-78. https://doi.org/10.1016/j.jnnfm.2019.07.004

We study theoretically pressure driven planar channel flow of shear thinning viscoelastic fluids. Combining linear stability analysis and full nonlinear simulation, we study the instability of an initially one-dimensional base state to the of two-dim... Read More about Linear instability of shear thinning pressure driven channel flow.

Dynamic Vorticity Banding in Discontinuously Shear Thickening Suspensions (2018)
Journal Article
Chacko, R., Mari, R., Cates, M., & Fielding, S. (2018). Dynamic Vorticity Banding in Discontinuously Shear Thickening Suspensions. Physical Review Letters, 121(10), Article 108003. https://doi.org/10.1103/physrevlett.121.108003

It has recently been argued that steady-state vorticity bands cannot arise in shear thickening suspensions because the normal stress imbalance across the interface between the bands will set up particle migrations. In this Letter, we develop a simple... Read More about Dynamic Vorticity Banding in Discontinuously Shear Thickening Suspensions.

Shear Reversal in Dense Suspensions: The Challenge to Fabric Evolution Models from Simulation Data (2018)
Journal Article
Chacko, R. N., Mari, R., Fielding, S. M., & Cates, M. E. (2018). Shear Reversal in Dense Suspensions: The Challenge to Fabric Evolution Models from Simulation Data. Journal of Fluid Mechanics, 847, 700-734. https://doi.org/10.1017/jfm.2018.279

Dense suspensions of hard particles are important as industrial or environmental materials (e.g. fresh concrete, food, paint or mud). To date, most constitutive models developed to describe them are, explicitly or effectively, ‘fabric evolution model... Read More about Shear Reversal in Dense Suspensions: The Challenge to Fabric Evolution Models from Simulation Data.

Edge-Induced Shear Banding in Entangled Polymeric Fluids (2018)
Journal Article
Hemingway, E. J., & Fielding, S. M. (2018). Edge-Induced Shear Banding in Entangled Polymeric Fluids. Physical Review Letters, 120(13), Article 138002. https://doi.org/10.1103/physrevlett.120.138002

Despite decades of research, the question of whether solutions and melts of highly entangled polymers exhibit shear banding as their steady state response to a steadily imposed shear flow remains controversial. From a theoretical viewpoint, an import... Read More about Edge-Induced Shear Banding in Entangled Polymeric Fluids.

Shear banding in large amplitude oscillatory shear (LAOStrain and LAOStress) of soft glassy materials (2018)
Journal Article
Radhakrishnan, R., & Fielding, S. M. (2018). Shear banding in large amplitude oscillatory shear (LAOStrain and LAOStress) of soft glassy materials. Journal of Rheology, 62(2), 559-576. https://doi.org/10.1122/1.5023381

We study theoretically shear banding in soft glassy materials subject to large amplitude time-periodic shear flows, considering separately the protocols of large amplitude oscillatory shear strain, large amplitude square or triangular or sawtooth str... Read More about Shear banding in large amplitude oscillatory shear (LAOStrain and LAOStress) of soft glassy materials.

Thickening of viscoelastic flow in a model porous medium (2017)
Journal Article
Hemingway, E., Clarke, A., Pearson, J., & Fielding, S. (2017). Thickening of viscoelastic flow in a model porous medium. Journal of Non-Newtonian Fluid Mechanics, 251, 56-68. https://doi.org/10.1016/j.jnnfm.2017.11.002

We study numerically two-dimensional creeping viscoelastic flow past a biperiodic square array of cylinders within the Oldroyd B, FENE-CR and FENE-P constitutive models of dilute polymer solutions. Our results capture the initial mild decrease then d... Read More about Thickening of viscoelastic flow in a model porous medium.

Edge Fracture in Complex Fluids (2017)
Journal Article
Hemingway, E. J., Kusumaatmaja, H., & Fielding, S. M. (2017). Edge Fracture in Complex Fluids. Physical Review Letters, 119(2), Article 028006. https://doi.org/10.1103/physrevlett.119.028006

We study theoretically the edge fracture instability in sheared complex fluids, by means of linear stability analysis and direct nonlinear simulations. We derive an exact analytical expression for the onset of edge fracture in terms of the shear-rate... Read More about Edge Fracture in Complex Fluids.

Understanding rheological hysteresis in soft glassy materials (2017)
Journal Article
Radhakrishnan, R., Divoux, T., Manneville, S., & Fielding, S. M. (2017). Understanding rheological hysteresis in soft glassy materials. Soft Matter, 13(9), 1834-1852. https://doi.org/10.1039/c6sm02581a

Motivated by recent experimental studies of rheological hysteresis in soft glassy materials, we study numerically strain rate sweeps in simple yield stress fluids and viscosity bifurcating yield stress fluids. Our simulations of downward followed by... Read More about Understanding rheological hysteresis in soft glassy materials.

Necking after extensional filament stretching of complex fluids and soft solids (2017)
Journal Article
Hoyle, D., & Fielding, S. (2017). Necking after extensional filament stretching of complex fluids and soft solids. Journal of Non-Newtonian Fluid Mechanics, 247, 132-145. https://doi.org/10.1016/j.jnnfm.2017.06.009

We perform linear stability analysis and nonlinear slender filament simulations of extensional necking in complex fluids and soft solids, during the stress relaxation process following an interrupted strain ramp. We start by deriving analytical crite... Read More about Necking after extensional filament stretching of complex fluids and soft solids.

Criteria for extensional necking instability in complex fluids and soft solids. Part II: Imposed tensile stress and force protocols (2016)
Journal Article
Hoyle, D. M., & Fielding, S. M. (2016). Criteria for extensional necking instability in complex fluids and soft solids. Part II: Imposed tensile stress and force protocols. Journal of Rheology, 60(6), 1377-1397. https://doi.org/10.1122/1.4965037

We study the necking of a filament of complex fluid or soft solid subject to uniaxial tensile stretching, separately under conditions of constant imposed tensile stress and constant imposed tensile force, by means of linear stability analysis and non... Read More about Criteria for extensional necking instability in complex fluids and soft solids. Part II: Imposed tensile stress and force protocols.

Criteria for extensional necking instability in complex fluids and soft solids. Part I: Imposed Hencky strain rate protocol (2016)
Journal Article
Hoyle, D. M., & Fielding, S. M. (2016). Criteria for extensional necking instability in complex fluids and soft solids. Part I: Imposed Hencky strain rate protocol. Journal of Rheology, 60(6), 1347-1375. https://doi.org/10.1122/1.4965036

We study theoretically the necking dynamics of a filament of complex fluid or soft solid in uniaxial tensile stretching at constant imposed Hencky strain rate ϵ̇ ϵ̇, by means of linear stability analysis and nonlinear (slender filament) simulations.... Read More about Criteria for extensional necking instability in complex fluids and soft solids. Part I: Imposed Hencky strain rate protocol.

Shear Banding of Soft Glassy Materials in Large Amplitude Oscillatory Shear (2016)
Journal Article
Radhakrishnan, R., & Fielding, S. M. (2016). Shear Banding of Soft Glassy Materials in Large Amplitude Oscillatory Shear. Physical Review Letters, 117(18), Article 188001. https://doi.org/10.1103/physrevlett.117.188001

We study shear banding in soft glassy materials subject to a large amplitude oscillatory shear flow (LAOS). By numerical simulations of the widely used soft glassy rheology model, supplemented by more general physical arguments, we demonstrate strong... Read More about Shear Banding of Soft Glassy Materials in Large Amplitude Oscillatory Shear.

Shear banding in large amplitude oscillatory shear (LAOStrain and LAOStress) of polymers and wormlike micelles (2016)
Journal Article
Carter, K. A., Girkin, J. M., & Fielding, S. M. (2016). Shear banding in large amplitude oscillatory shear (LAOStrain and LAOStress) of polymers and wormlike micelles. Journal of Rheology, 60(5), Article 883. https://doi.org/10.1122/1.4960512

We investigate theoretically shear banding in large amplitude oscillatory shear (LAOS) of polymers and wormlike micelles. In LAOStrain we find banding at low frequencies and sufficiently high strain rate amplitudes in fluids for which the underlying... Read More about Shear banding in large amplitude oscillatory shear (LAOStrain and LAOStress) of polymers and wormlike micelles.

Triggers and signatures of shear banding in steady and time-dependent flows (2016)
Journal Article
Fielding, S. (2016). Triggers and signatures of shear banding in steady and time-dependent flows. Journal of Rheology, 60(5), 821-834. https://doi.org/10.1122/1.4961480

This précis is aimed as a practical field guide to situations in which shear banding might be expected in complex fluids subject to an applied shear flow. Separately for several of the most common flow protocols, it summarizes the characteristic sign... Read More about Triggers and signatures of shear banding in steady and time-dependent flows.

Correlation lengths in hydrodynamic models of active nematics (2016)
Journal Article
Hemingway, E., Mishra, P., Marchetti, M., & Fielding, S. (2016). Correlation lengths in hydrodynamic models of active nematics. Soft Matter, 12(38), 7943-7952. https://doi.org/10.1039/c6sm00812g

We examine the scaling with activity of the emergent length scales that control the nonequilibrium dynamics of an active nematic liquid crystal, using two popular hydrodynamic models that have been employed in previous studies. In both models we find... Read More about Correlation lengths in hydrodynamic models of active nematics.

Viscoelastic and elastomeric active matter: Linear instability and nonlinear dynamics (2016)
Journal Article
Hemingway, E., Cates, M., & Fielding, S. (2016). Viscoelastic and elastomeric active matter: Linear instability and nonlinear dynamics. Physical Review E, 93(3), Article 032702. https://doi.org/10.1103/physreve.93.032702

We consider a continuum model of active viscoelastic matter, whereby an active nematic liquid crystal is coupled to a minimal model of polymer dynamics with a viscoelastic relaxation time τC. To explore the resulting interplay between active and poly... Read More about Viscoelastic and elastomeric active matter: Linear instability and nonlinear dynamics.

Moving contact line dynamics: from diffuse to sharp interfaces (2015)
Journal Article
Kusumaatmaja, H., Hemingway, E., & Fielding, S. (2016). Moving contact line dynamics: from diffuse to sharp interfaces. Journal of Fluid Mechanics, 788, 209-227. https://doi.org/10.1017/jfm.2015.697

We reconcile two scaling laws that have been proposed in the literature for the slip length associated with a moving contact line in diffuse interface models, by demonstrating each to apply in a different regime of the ratio of the microscopic interf... Read More about Moving contact line dynamics: from diffuse to sharp interfaces.

Clustering and phase behaviour of attractive active particles with hydrodynamics (2015)
Journal Article
Matas Navarro, R., & Fielding, S. M. (2015). Clustering and phase behaviour of attractive active particles with hydrodynamics. Soft Matter, 11(38), 7525-7546. https://doi.org/10.1039/c5sm01061f

We simulate clustering, phase separation and hexatic ordering in a monolayered suspension of active squirming disks subject to an attractive Lennard-Jones-like pairwise interaction potential, taking hydrodynamic interactions between the particles ful... Read More about Clustering and phase behaviour of attractive active particles with hydrodynamics.

Age-Dependent Modes of Extensional Necking Instability in Soft Glassy Materials (2015)
Journal Article
Hoyle, D. M., & Fielding, S. M. (2015). Age-Dependent Modes of Extensional Necking Instability in Soft Glassy Materials. Physical Review Letters, 114(15), Article 158301. https://doi.org/10.1103/physrevlett.114.158301

We study the instability to necking of an initially cylindrical filament of soft glassy material subject to extensional stretching. By numerical simulation of the soft glassy rheology model and a simplified fluidity model, and by analytical predictio... Read More about Age-Dependent Modes of Extensional Necking Instability in Soft Glassy Materials.

Active Viscoelastic Matter: From Bacterial Drag Reduction to Turbulent Solids (2015)
Journal Article
Hemingway, E., Maitra, A., Banerjee, S., Marchetti, M., Ramaswamy, S., Fielding, S., & Cates, M. (2015). Active Viscoelastic Matter: From Bacterial Drag Reduction to Turbulent Solids. Physical Review Letters, 114(9), Article 098302. https://doi.org/10.1103/physrevlett.114.098302

A paradigm for internally driven matter is the active nematic liquid crystal, whereby the equations of a conventional nematic are supplemented by a minimal active stress that violates time-reversal symmetry. In practice, active fluids may have not on... Read More about Active Viscoelastic Matter: From Bacterial Drag Reduction to Turbulent Solids.

Shear banding in soft glassy materials (2014)
Journal Article
Fielding, S. M. (2014). Shear banding in soft glassy materials. Reports on Progress in Physics, 77(10), https://doi.org/10.1088/0034-4885/77/10/102601

Many soft materials, including microgels, dense colloidal emulsions, star polymers, dense packings of multilamellar vesicles, and textured morphologies of liquid crystals, share the basic 'glassy' features of structural disorder and metastability. Th... Read More about Shear banding in soft glassy materials.

Hydrodynamic suppression of phase separation in active suspensions (2014)
Journal Article
Matas-Navarro, R., Golestanian, R., Liverpool, T. B., & Fielding, S. M. (2014). Hydrodynamic suppression of phase separation in active suspensions. Physical review E: Statistical, nonlinear, and soft matter physics, 90(3), Article 032304. https://doi.org/10.1103/physreve.90.032304

We simulate with hydrodynamics a suspension of active disks squirming through a Newtonian fluid. We explore numerically the full range of squirmer area fractions from dilute to close packed and show that “motility induced phase separation,” which was... Read More about Hydrodynamic suppression of phase separation in active suspensions.

Shear banding in time-dependent flows of polymers and wormlike micelles (2013)
Journal Article
Moorcroft, R., & Fielding, S. (2014). Shear banding in time-dependent flows of polymers and wormlike micelles. Journal of Rheology, 58(1), 103-147. https://doi.org/10.1122/1.4842155

We study theoretically the formation of shear bands in time-dependent flows of polymeric and wormlike micellar surfactant fluids, focussing on the protocols of step shear stress, step shear strain (or in practice a rapid strain ramp), and shear startup... Read More about Shear banding in time-dependent flows of polymers and wormlike micelles.

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.

Aging and rheology in soft materials (2000)
Journal Article
Fielding, S., Sollich, P., & Cates, M. (2000). Aging and rheology in soft materials. Journal of Rheology, 44(2), 323-369