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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/38828

Title: Dynamic and wear study of an extremely bidisperse magnetorheological fluid
Authors: Iglesias, Guillermo R.
Fernández Ruiz-Morón, Luis
García López-Durán, Juan de Dios
Delgado, Ángel V.
Issue Date: 2015
Abstract: In this work the friction and wear properties of five magnetorheologicalfluids (MRFs)with varying compositions are investigated. Considering that many of the proposed applications for these fluids involve lubricated contact between mobile metal –metal or polymer– metal parts, the relationship between MR response and wear behavior appears to be of fundamental importance. One of the fluids(MR#1)contains only the iron microparticles and base oil; the second and third ones(MR#2 and MR#3) contain an anti-wear additive as well. The fourth one(MR#4)is a well known commercial MRF. Finally, MR#5 is stabilized by dispersing the iron particles in a magnetite ferrofluid. The MR response of the latter fluid is better(higher yield stress and post-yield viscosity)than that of the others. More importantly, it remains(and even improves)after the wear test: the pressure applied in the four-ball apparatus produces a compaction of the magnetite layer around the iron microparticles. Additionally, the friction coefficient is larger, which seems paradoxical in principle, but can be explained by considering the stability of MR#5 in comparison to the other four MRs, which appear to undergo partial phase separation during the test. In fact, electron and optical microscope observations confirm a milder wear effect of MR#5, with almost complete absence of scars from the steel test spheres and homogeneous and shallow grooves on them. Comparatively, MR#2, MR#3 and, particularly, MR#1 produce a much more significant wear.
Sponsorship: MINECO Ramón y Cajal Programme (RYC-2014-16901)
MINECO FIS 2013-07666-C3-1-R
CEI Biotic BS27.2015
Junta de Andalucía, PE2012-FQM-0694
Publisher: Institute of Physics (IOP)
Description: Acceso a la versión publicada en Smart Mater. Struct. 24(12) 127001 (http://iopscience.iop.org/0964-1726/24/12/127001)
"This is an author-created, un-copyedited version of an article accepted for publication/published in Smart Materials and Structures. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/10.1088/0964-1726/24/12/127001."
Series/Report no.: Repsol;2015
Keywords: Bimodal MRF
Magnetorheological fluids
Wear prevention
Four-ball method
Magnetic nanoparticles
URI: http://hdl.handle.net/10481/38828
ISSN: 0964-1726
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Iglesias, G.R.; et al. Dynamic and wear study of an extremely bidisperse magnetorheological fluid. Smart Materials and Structures, 24(12): 127001 (2015). [http://hdl.handle.net/10481/38828]
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