Non-linear viscoelastic response of magnetic fiber suspensions in oscillatory shear / Kuzhir P.,Gomez-Ramirez A.,Lopez-Lopez M. T.,Bossis G.,Zubarev A. Yu. // JOURNAL OF NON-NEWTONIAN FLUID MECHANICS. - 2011. - V. 166, l. 7-8. - P. 373-385.

ISSN/EISSN:

0377-0257 / 1873-2631

Type:

Article

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 37 mu m and diameter of 4.9 mu m, 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 stressed, 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. (C) 2011 Elsevier B.V. All rights reserved.

Author keywords:

Magnetorheology; Fiber suspension; Non-linear viscoelasticity; Oscillatory shear ELECTRORHEOLOGICAL FLUIDS; MAGNETORHEOLOGICAL FLUIDS; ELONGATED PARTICLES; WHISKER SUSPENSIONS; COMPLEX FLUIDS; FLOW; BEHAVIOR; DYNAMICS; STRESS; MODEL

DOI:

10.1016/j.jnnfm.2011.01.008

Web of Science ID:

ISI:000289389500004

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	APR
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1873-2631
Keywords-Plus	ELECTRORHEOLOGICAL FLUIDS; MAGNETORHEOLOGICAL FLUIDS; ELONGATED PARTICLES; WHISKER SUSPENSIONS; COMPLEX FLUIDS; FLOW; BEHAVIOR; DYNAMICS; STRESS; MODEL
Research-Areas	Mechanics
Web-of-Science-Categories	Mechanics
Author-Email	kuzhir@unice.fr anagr@ugr.es modesto@ugr.es bossis@unice.fr Andrey.Zubarev@usu.ru
ResearcherID-Numbers	Zubarev, Adrey/B-4752-2014 Lopez-Lopez, Modesto T/K-7327-2012 Gomez-Ramirez, Ana Maria/G-4471-2016
ORCID-Numbers	Lopez-Lopez, Modesto T/0000-0002-9068-7795 Gomez-Ramirez, Ana Maria/0000-0003-4402-7515 Kuzhir, Pavel/0000-0001-7089-6197
Funding-Acknowledgement	Biomag (PACA); Eureka E! 3733 Hydrosmart project; Dynxperts project {[}FP7-2010-NMP-ICT-FoF-260073]; MICINN, Spain {[}FIS2009-07321]; Junta de Andalucia, Spain {[}P08-FQM-3993, P09-FQM-4787]; CNRS; BRFFR (France-Belarus) {[}23178]; University of Granada (Spain)
Funding-Text	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 Andalucia, 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).
Number-of-Cited-References	53
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	23
Journal-ISO	J. Non-Newton. Fluid Mech.
Doc-Delivery-Number	748KM