Describing and prescribing the constitutive response of yield stress fluids using large amplitude oscillatory shear stress (LAOStress)

By C. Dimitriou, R. Ewoldt, G. H. McKinley. 2013

266 citations recorded by the source corpus.

Large amplitude oscillatory shear (LAOS) is used as a tool to probe the nonlinear rheological response of a model elasto-viscoplastic material (a Carbopol microgel). In contrast to most recent studies, these large amplitude measurements are carried out in a stress-controlled manner. We outline a descriptive framework of characterization measures for nonlinear rheology under stress-controlled LAOS, and this is contrasted experimentally to the strain-controlled framework that is more commonly used. We show that this stress-controlled methodology allows for a physically intuitive interpretation of the yielding behavior of elasto-viscoplastic materials. The insight gained into the material behavior through these nonlinear measures is then used to develop two constitutive models that prescribe the rheological response of the Carbopol microgel. We show that these two successively more sophisticated constitutive models, which are based on the idea of strain decomposition, capture in a compact manner the important features of the nonlinear rheology of the microgel. The second constitutive model, which incorporates the concept of kinematic hardening, embodies all of the essential behaviors exhibited by Carbopol. These include elasto-viscoplastic creep and time-dependent viscosity plateaus below a critical stress, a viscosity bifurcation at the critical stress, and Herschel–Bulkley flow behavior at large stresses.

Subfields: Fluid Flow and Transfer Processes, Polymers and Plastics, Pulmonary and Respiratory Medicine

View Paper: https://www.semanticscholar.org/paper/175325fb51536b43a85f68243938a8be9a61ce7e

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In Fluid Flow and Transfer Processes

In Polymers and Plastics

In Pulmonary and Respiratory Medicine

Citations in the corpus

Mapping thixo-elasto-visco-plastic behavior (2017, methodology): “0 p d dt      that diverges as a power law in time (Dimitriou et al. 2013) because the”
Numerical simulations of complex yield-stress fluid flows (2017, methodology): “Although these observations demonstrate the importance of elasticity in such systems, very few theoretical works have been conducted incorporating the elastic effects into the modelling of the constitutive equation (Saramito 2007; Dimitriou et al. 2013).”
Yield stress fluid flows: A review of experimental data (2014, background): “However during such a process the material undergoes a complex flow history made of undetermined periods in the solid regime or in the liquid regime, which significantly complicates the interpretation of data, even if recent works have provided keys for a qualitative and sometimes quantitative inter”
Rheological Characterization of Carbopol® Dispersions in Water and in Water/Glycerol Solutions (2019, background): “Instrument inertia [61] and flow inhomogeneity [59] effects are corrected for.”