Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/111992
Title: Non-Linear Viscoelastic Response of Magnetic Fiber Suspensions in Oscillatory Shear
Authors: Kuzhir, P.
Gómez-Ramírez, A.
López-López, M. T.
Bossis, G.
Zubarev, A. Y.
Issue Date: 2011
Publisher: Elsevier BV
Citation: Non-Linear Viscoelastic Response of Magnetic Fiber Suspensions in Oscillatory Shear / P. Kuzhir, A. Gómez-Ramírez, M. T. López-López et al. // Journal of Non-Newtonian Fluid Mechanics. — 2011. — Vol. 166. — Iss. 7-8. — P. 373-385.
Abstract: This paper reports the first study on the large amplitude oscillatory shear flow for magnetic fiber suspensions subject to a magnetic field perpendicular to the flow. The suspensions used in our experiments consisted of cobalt microfibers of the average length of 37μm and diameter of 4.9μm, dispersed in a silicon oil. Rheological measurements have been carried out at imposed stress using a controlled stress magnetorheometer. The stress dependence of the shear moduli presented a staircase-like decrease with, at least, two viscoelastic quasi-plateaus corresponding to the onset of microscopic and macroscopic scale rearrangement of the suspension structure, respectively. The frequency behavior of the shear moduli followed a power-law trend at low frequencies and the storage modulus showed a high-frequency plateau, typical for Maxwell behavior. Our simple single relaxation time model fitted reasonably well the rheological data. To explain a relatively high viscous response of the fiber suspension, we supposed a coexistence of percolating and pivoting aggregates. Our simulations revealed that the former became unstable beyond some critical stress and broke in their middle part. At high stresses, the free aggregates were progressively destroyed by shear forces that contributed to a drastic decrease of the moduli. We have also measured and predicted the output strain waveforms and stress-strain hysteresis loops. With the growing stress, the shape of the stress-strain loops changed progressively from near-ellipsoidal one to the rounded-end rectangular one due to a progressive transition from a linear viscoelastic to a viscoplastic Bingham-like behavior. © 2011 Elsevier B.V.
Keywords: FIBER SUSPENSION
MAGNETORHEOLOGY
NON-LINEAR VISCOELASTICITY
OSCILLATORY SHEAR
AVERAGE LENGTH
CRITICAL STRESS
FIBER SUSPENSIONS
FREQUENCY BEHAVIOR
HIGH FREQUENCY HF
HIGH STRESS
LARGE AMPLITUDE OSCILLATORY SHEAR
LINEAR VISCOELASTIC
LOW FREQUENCY
MACROSCOPIC SCALE
MAGNETIC FIBERS
MAGNETO-RHEOLOGY
MICROFIBERS
NON-LINEAR
NON-LINEAR VISCOELASTICITY
OSCILLATORY SHEAR
OUTPUT STRAIN
POWER-LAW
RHEOLOGICAL DATA
RHEOLOGICAL MEASUREMENTS
SHEAR FORCE
SHEAR MODULUS
SILICON OIL
SINGLE RELAXATION TIME MODELS
STORAGE MODULI
STRESS DEPENDENCE
STRESS-STRAIN HYSTERESIS LOOPS
STRESS-STRAIN LOOPS
SUSPENSION STRUCTURE
VISCOPLASTIC
VISCOUS RESPONSE
COBALT
ELASTIC MODULI
ELASTICITY
FIBERS
HYSTERESIS
HYSTERESIS LOOPS
MAGNETIC FIELDS
MAGNETIC MATERIALS
RHEOLOGY
SHEAR FLOW
SHEAR STRAIN
SHEAR STRESS
SUSPENSIONS (COMPONENTS)
VISCOELASTICITY
VISCOSITY
SUSPENSIONS (FLUIDS)
URI: http://hdl.handle.net/10995/111992
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 79952484395
ISSN: 0377-0257
metadata.dc.description.sponsorship: Biomag (PACA), Eureka E! 3733 Hydrosmart project, Dynxperts project (ref. FP7-2010-NMP-ICT-FoF-260073), FIS2009-07321 (MICINN, Spain), P08-FQM-3993, P09-FQM-4787 (Junta de Andalucía, Spain) and Cooperation Program between CNRS and BRFFR (No 23178, France-Belarus) are acknowledged for the financial support. One of the authors (M.T.L.-L.) also acknowledges financial support by the University of Granada (Spain).
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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