A low sedimentation magnetorheological fluid based on plate-like iron particles, and verification using a damper test

This study presents a new kind of low sedimentation magnetorheological fluid (MRF). Its salient properties are evaluated using a small-sized damper. The proposed MRF is characterized to investigate the effect of plate-like iron particles on rheological properties such as yield stress and flow behavi...

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Bibliographic Details
Published in:Smart materials and structures 2014-02, Vol.23 (2), p.1-9
Main Authors: Shah, Kruti, Phu, Do Xuan, Seong, Min-Sang, Upadhyay, R V, Choi, Seung-Bok
Format: Article
Language:English
Subjects:
bidisperse MRF
Cross-disciplinary physics: materials science
rheology
Dampers
Damping
Electric appliances
Electro- and magnetorheological fluids
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Iron
magnetorheological fluid (MRF)
Magnetorheological fluids
Material types
MR damper
particles sedimentation
Physical properties
Physics
plate-like iron particles
rheological property
Rheology
Sedimentation
Solid mechanics
Structural and continuum mechanics
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
Yield stress
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Summary:This study presents a new kind of low sedimentation magnetorheological fluid (MRF). Its salient properties are evaluated using a small-sized damper. The proposed MRF is characterized to investigate the effect of plate-like iron particles on rheological properties such as yield stress and flow behavior. Plate-like micron size iron particles play an important role in improving stability against rapid sedimentation as well as in enhancing the value of the yield stress. This study also considers a bidisperse MRF because this can produce a higher yield stress compared with a monodisperse suspension. Since the field-dependent yield stress is the key factor in mechanical applications, the physical properties of the MRF proposed in this work are evaluated and applied to the design of a small-sized damper which can be used for vibration control in washing machines. In order to verify the smaller effect on the damping force due to the particle sedimentation, the field-dependent damping forces are measured under two different operating conditions; one is just after filling the MRF and another after operating for 48 h. The proposed MRF is shown to be very effective in reducing adverse effects due to particle sedimentation.
ISSN:0964-1726
1361-665X
DOI:10.1088/0964-1726/23/2/027001