An experimental investigation into the off-state viscosity of MR fluids

K. H. Gudmundsson*, F. Jonsdottir, F. Thorsteinsson, O. Gutfleisch

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This study investigates the off-state rheological characteristics of magnetorheological (MR) fluids. Various carbonyl iron powder grades are tested, both micron- and nano-sized. The study considers both monodisperse and bidisperse MR fluid samples. The bidisperse MR fluids are both micron-sized only compositions and mixed micron- and nano-sized compositions. All fluid compositions employ a novel perfluorinated polyether (PFPE) oil as a base fluid. This base fluid is introduced and its qualities discussed. An off-state experimental investigation is conducted, for shear-rates from 0 to 200 s -1. All samples exhibit the well known shear-thinning property of MR fluids but with varying proportions. The off-state viscosity is of importance in a particular application, in an MR prosthetic knee. It determines how fast the knee joint can rotate in the absence of a magnetic field. A prominent MR fluid composition is selected for the proposed application which aims to maximize to rotational speed of the MR knee joint in the absence of a magnetic field.

Original languageEnglish
Title of host publicationElectro-Rheological Fluids and Magneto-Rheological Suspensions - Proceedings of the 12th International Conference
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages679-685
Number of pages7
ISBN (Print)9814340227, 9789814340229
DOIs
Publication statusPublished - 2011
Event12th International Conference on Electrorheological Fluids and Magnetorheological Suspensions, ERMR 2010 - Philadelphia, PA, United States
Duration: 16 Aug 201020 Aug 2010

Publication series

NameElectro-Rheological Fluids and Magneto-Rheological Suspensions - Proceedings of the 12th International Conference

Conference

Conference12th International Conference on Electrorheological Fluids and Magnetorheological Suspensions, ERMR 2010
Country/TerritoryUnited States
CityPhiladelphia, PA
Period16/08/1020/08/10

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