Investigation of the properties of selected magnetorheological fluids

Abstract

The paper presents the results of research on the rheological properties of magnetorheological (MR) fluids with different physical and chemical compositions. The research concerned complete compositions of MR fluids as well as base fluids (samples containing no particles with ferromagnetic properties). Magnetorheological fluids consisted mainly of a carrier liquid in the form of glycerin or OKS 352 silicone oil, with magnetite or iron pentacarbonyl particles. The paper demonstrates the effect of the selection of individual components of the MR fluids on their rheological properties, paying attention to the interaction of the base liquid with the particles of the solid phase of the MR fluid. Under the conditions of exposure to a magnetic field, the type of ferromagnetic particles (their magnetic properties) have a decisive impact on the magnetorheological response of the fluid (change in rheological properties due to the effect of the magnetic field on the fluid). The magnetite-based samples showed a tangential stress of 1000 Pa, while the use of iron carbonyl allowed to obtain approximately 8000 Pa (with respect to the case where B = 500 mT, [Formula: see text]). No significant differences in rheological properties were recorded between the oleic acid- and silica-stabilized samples.

Investigation the Effect of MR Fluid Composition on Properties at Low Strain Ranges

“…The test parameters were as follows: strain (γ = 0.001 to 1000%), changed according to the logarithmic profile (5 points/dec), angular velocity (ω = 101/s), value of the applied magnetic induction (B = 0, 50, 100, 200, 400, and 500 mT). The mag-netic field induction values were selected on the basis of previous studies discussed in the paper [28].…”

“…the applied magnetic induction (B = 0, 50, 100, 200, 400, and 500 mT). The magnetic field induction values were selected on the basis of previous studies discussed in the paper [28].…”

“…In contrast, at 60-70% CI mass share, the shear stress of the MR fluid first increased and then stabilized with an increase in magnetic field strength. The authors of [28] presented the results of tests on the rheological properties of magnetorheological fluids with different physicochemical compositions. The tests concerned both the complete compositions of MR fluids and the base liquids (the samples containing no particles with ferromagnetic properties).…”

“…This article is a more detailed supplement to the work conducted in [28]. The main objective of the work included the assessment of the influence of selected components on one of the key properties of MR fluids, which is the yield stress.…”