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Synthesis and field dependent shear stress evaluation of stable MR fluid for brake application

Lijesh K.P. (Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India)
Deepak Kumar (Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India)
Harish Hirani (Central Mechanical Engineering Research Institute, Durgapur, India)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 4 September 2017

289

Abstract

Purpose

The purpose of this paper is to report on the development of magnetorheological (MR) fluids, having high on-state shear stress/viscosity, low off-state shear stress/viscosity, good redispersibility and stable suspension of carbonyl iron particles, using tetramethyl ammonium hydroxide (TAH) and oleic acid.

Design/methodology/approach

MR fluids for use in brakes are synthesized using different weight percentages of silicone oil, TAH, oleic acid and iron particles. The effects of TAH and oleic acid are studied. Shear stress is measured as a function of magnetic field on a magneto-rheometer. The images of MR particles settling with time are presented. The test set-up used to evaluate the performance of the MR fluids synthesized for brake application is detailed. Finally, a significant improvement in the MR performance of brakes is reported.

Findings

The MR fluid having 0.25 Wt.% oleic acid showed low off-state viscosity/shear stress and high on-state viscosity/shear stress. A higher weight percentage of TAH in the MR fluid further reduced the low off-shear stress and increased the high on-state shear stress with better stability.

Originality/value

Improvement of MR brake performance by adding surfactants like TAH and oleic acid has been the subject matter of several studies in the past, but these studies used a fixed percentage of surfactants in MR fluids. In the present work, the optimum percentage of TAH and oleic acid for an improved braking performance is determined by varying their content in the MR fluid, which has not been reported in any other work thus far.

Keywords

Citation

K.P., L., Kumar, D. and Hirani, H. (2017), "Synthesis and field dependent shear stress evaluation of stable MR fluid for brake application", Industrial Lubrication and Tribology, Vol. 69 No. 5, pp. 655-665. https://doi.org/10.1108/ILT-03-2016-0061

Publisher

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Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited

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