Impact of corrosion process of carbonyl iron particles on magnetorheological behavior of their suspensions

Plachý, Tomáš; Kutálková, Erika; Sedlačík, Michal; Vesel, Alenka; Masař, Milan; Kuřitka, Ivo

doi:10.1016/j.jiec.2018.06.002

Cited by 47 publications

(34 citation statements)

References 42 publications

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“…Figure 5b further shows the results from an anti-acid/corrosion test. As known, bare CI particles are relatively unstable in acidic environment, which leads to a formation of less magnetic products [39,40]. On the contrary, both variants of CI- g -PHEMATMS particles were extremely stable under these acidic conditions, regardless of the thickness of the layer, which imply that the PHEMATMS layers were uniform without any defects and the iron cores were efficiently protected.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Performance, Damping, and Surface Properties of Magnetorheological Elastomers via Particle-Grafting Technology

et al. 2018

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A novel concept based on advanced particle-grafting technology to tailor performance, damping, and surface properties of the magnetorheological elastomers (MREs) is introduced. In this work, the carbonyl iron (CI) particles grafted with poly(trimethylsilyloxyethyl methacrylate) (PHEMATMS) of two different molecular weights were prepared via surface-initiated atom transfer radical polymerization and the relations between the PHEMATMS chain lengths and the MREs properties were investigated. The results show that the magnetorheological performance and damping capability were remarkably influenced by different interaction between polydimethylsiloxane chains as a matrix and PHEMATMS grafts due to their different length. The MRE containing CI grafted with PHEMATMS of higher molecular weight exhibited a greater plasticizing effect and hence both a higher relative magnetorheological effect and enhanced damping capability were observed. Besides bulk MRE properties, the PHEMATMS modifications influenced also field-induced surface activity of the MRE sheets, which manifested as notable changes in surface roughness.

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Section: Resultsmentioning

confidence: 99%

Tailoring Performance, Damping, and Surface Properties of Magnetorheological Elastomers via Particle-Grafting Technology

et al. 2018

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“…/H The second point we need to take into account is that, in the plate-plate configuration, the yield stress provided by the software is overestimated by a factor of 4/3 Laun et al, 2010). The data collected in different publications (Kordonski and Golini, 1999;Chin et al, 2001;Lim et al, 2004;Jang et al, 2005;Cheng et al, 2009;Ierardi and Bombard, 2009;Laun et al, 2010;Kim et al, 2012;Bombard et al, 2015;Esmaeilnezhad et al, 2017;Dong et al, 2018;Plachy et al, 2018) are reported in Table S1 and plotted in Figure 1B (blue diamonds). There is a considerable scatter of the data, but it appears clearly that the affine model with the calculation of forces through FEM (red curve), provides the best prediction compared to both Equation (6) and Equation (7).…”

Section: Comparison With Experimentsmentioning

confidence: 99%

The Role of Volume Fraction and Additives on the Rheology of Suspensions of Micron Sized Iron Particles

Bossis¹,

Volkova²,

Grasselli

et al. 2019

Front. Mater.

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The increase of the yield stress vs. the magnetic field is the most important quantity characterizing the efficiency of a magnetorheological suspension. The theory based on the formation of columnar aggregates predicts a linear variation with the volume fraction of magnetic particles. In this paper we review previous models used to calculate forces and yield stress and will introduce a new model based on rupture at zero strain. Predictions of these models are compared with the experimental data obtained for carbonyl iron particles, by different authors. Whereas, previous analytical prediction strongly overestimates experimental yield stress, those calculated using the Finite Element Method (FEM), together with affine trajectories, reproduce the experiments well and show a linear dependence with the volume fraction and a H 3/2 behavior between 50 and 200 kA/m. Nevertheless, at very high-volume fractions (>55%), where the suspension can only flow in the presence of specific additives, the dependence of the yield stress vs. the volume fraction and the magnetic field is dramatically changed. We observed a jamming transition, which is triggered by the application of a low magnetic field and which depends strongly on the volume of the fraction. Here, we will discuss new perspectives arising from the use of these very high-volume fractions.

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“…This finding confirms the study conducted by Desrosiers et al [14], who worked on slippage clutch systems. Another study conducted by Plachy et al [31] investigated the impact of thermal and chemical oxidative processes of carbonyl iron particles on MR performances, and found that the oxidized particles showed lower values of the yield stress that then affect the viscosity of MR fluid. Although the rheological and morphological properties of MR fluid have been shown to impact long-term operation, it is, however, still not clear which factor affects MR fluid performances, magnetic particles, or the carrier fluid more.…”

Section: Resultsmentioning

confidence: 99%

Material Characterization of a Magnetorheological Fluid Subjected to Long-Term Operation in Damper

et al. 2018

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This paper investigates the field-dependent rheological properties of magnetorheological (MR) fluid used to fill in MR dampers after long-term cyclic operation. For testing purposes, a meandering MR valve was customized to create a double-ended MR damper in which MR fluid flowed inside the valve due to the magnetic flux density. The test was conducted for 170,000 cycles using a fatigue dynamic testing machine which has 20 mm of stroke length and 0.4 Hz of frequency. Firstly, the damping force was investigated as the number of operating cycles increased. Secondly, the change in viscosity of the MR fluid was identified as in-use thickening (IUT). Finally, the morphological observation of MR particles was undertaken before and after the long-term operation. From these tests, it was demonstrated that the damping force increased as the number of operating cycles increases, both when the damper is turn on (on-state) and off (off-state). It is also observed that the particle size and shape changed due to the long operation, showing irregular particles.

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Impact of corrosion process of carbonyl iron particles on magnetorheological behavior of their suspensions

Cited by 47 publications

References 42 publications

Tailoring Performance, Damping, and Surface Properties of Magnetorheological Elastomers via Particle-Grafting Technology

Tailoring Performance, Damping, and Surface Properties of Magnetorheological Elastomers via Particle-Grafting Technology

The Role of Volume Fraction and Additives on the Rheology of Suspensions of Micron Sized Iron Particles

Material Characterization of a Magnetorheological Fluid Subjected to Long-Term Operation in Damper

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