NDLI: Understanding rheological hysteresis in soft glassy materials

Content Provider	Royal Society of Chemistry (RSC)
Author	Radhakrishnan, Rangarajan Fielding, Suzanne M. Divoux, Thibaut Manneville, Sébastien
Copyright Year	2017
Abstract	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 upward strain rate sweeps, performed within fluidity models and the soft glassy rheology model, successfully capture the experimentally observed monotonic decrease of the area of the rheological hysteresis loop with sweep time in simple yield stress fluids, and the bell shaped dependence of hysteresis loop area on sweep time in viscosity bifurcating fluids. We provide arguments explaining these two different functional forms in terms of differing tendencies of simple and viscosity bifurcating fluids to form shear bands during the sweeps, and show that the banding behaviour captured by our simulations indeed agrees with that reported experimentally. We also discuss the difference in hysteresis behaviour between inelastic and viscoelastic fluids. Our simulations qualitatively agree with the experimental data discussed here for four different soft glassy materials.
Starting Page	1834
Ending Page	1852
Page Count	19
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	13
Issue Number	9
Journal	Soft Matter
DOI	10.1039/c6sm02581a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Viscosity Viscoelasticity Yield (engineering) Rheology Dependent and independent variables Hysteresis Strain rate
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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