Internal structures and elastic properties of concentrated magnetorheological fluids
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part of Springer Nature, 2020 https://doi.org/10.1140/epjst/e2020-000107-x
THE EUROPEAN PHYSICAL JOURNAL SPECIAL TOPICS
Regular Article
Internal structures and elastic properties of concentrated magnetorheological fluids Andrey Zubarev1,2 , Dmitry Chirikov1,a , and Dmitry Borin3 1
2
3
Theoretical and Mathematical Physics Department, Ural Federal University, Yekaterinburg, Russia M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia Institute of Mechatronic Engineering, Chair of Magnetofluid dynamics, Measuring and Automation Technology, TU Dresden, Germany Received 5 June 2020 / Accepted 10 September 2020 Published online 19 November 2020 Abstract. Aggregation of non-Brownian magnetizable particles and elastic properties of a magnetorheological suspension placed in an external magnetic field are studied by using computer simulations. The results demonstrate branched labyrinth structures as well as nonmonotonic dependence of the shear stress vs. macroscopic shear deformation with a maximum at a certain deformation.
1 Introduction Magnetorheological fluids (or magnetorheological suspensions, MRSs) are suspensions of micron-sized magnetizable non-Brownian particles in a carrier fluid. These systems attract considerable interest of researchers and engineers due to rich set of unique physical properties valuable for many modern and progressive high technologies. In part, under the action of an applied magnetic field, viscosity, and other rheological properties of these systems can be changed up to several orders of magnitude. MRSs are actively used in damper engineering, instrument making, orthopedics, in safety devices to reduce traumatic impacts, as well as in many other technologies. The ability to bring MRSs into macroscopic motion using an external magnetic field is actively used in biomedical technologies (for magnetotransport of drugs to the affected part of the body; for immobilization of antibodies and biopolymers; for creating the effect of local hyperthermia used in the treatment of tumor diseases). Overviews of works on physics of these fluids and their practical application can be found in references [1–4]. The strong dependence of rheological properties of MRSs on applied magnetic field can be explained by the aggregation of the particles into linear chains, dense bulk and other anisotropic structures oriented along applied magnetic field. When these structures overlap a chamber filled with MRSs and bridge the walls of the chamber, the rheological state of the suspension changes from the liquid to a quasi-elastic one. This effect is used in many modern technologies, for example, in shock absorbers, clutches, magnetic field sensors, etc. [5]. a
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The European Physical Journal Special Topics
Fig. 1. Three-dimensional visualization of MR fluid based on iron microparticles (average particle size 35 µm) structured in an external magnetic field with a strength of 100 kA/m. The image is obtained using computed
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