Topic
Magnetorheological fluid
About: Magnetorheological fluid is a research topic. Over the lifetime, 8538 publications have been published within this topic receiving 131502 citations. The topic is also known as: MRF & MR fluid.
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TL;DR: In this paper, both synthesis and magnetorheological characteristics of magnetic particles concerning electro-thermoconductive MR suspensions are reviewed. And experimental results and discussions on them are presented.
Abstract: We review both synthesis and magnetorheological (MR) characteristics of magnetic particles concerning electro-thermoconductive MR suspensions. Various MR systems from nanoparticles to microparticles of iron, iron oxides and metallic solids with and without additives or modifications with polymers are summarized. Methods for electro-thermoconductive MR suspensions and mechanisms that lend them these properties, experimental results and discussions on them are presented.
68 citations
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TL;DR: In this article, the main mechanism responsible for the decrease of material removal rate on hard materials for a wheel-type magnetorheological finishing process is examined, both theoretically and experimentally, and a solution to this problem is devised via two approaches.
Abstract: The use of magnetorheological fluids for finishing is one of the most promising smart processes for the fabrication of ultra-fine surfaces, particularly three-dimensional millimeter or micrometer structures. This process is not readily applicable to hard-surface materials, like an Al 2 O 3 –TiC hard disk slider, if a conventional rotating tool is used. This is due to the rotational speed and the resulting actual impressed abrasion energy limits, and the consequent low efficiency of the material removal rate. In this study, the main mechanism responsible for the decrease of the material removal rate on hard materials for a wheel-type magnetorheological finishing process is examined, both theoretically and experimentally, and a solution to this problem is devised via two approaches. The first uses a rectilinear alternating motion to improve processing conditions, and the second focuses on the use of more effective abrasives, namely magnetizable abrasives made of iron powders sintered with carbon nanotubes, which are new abrasives that have not yet been introduced in the field of surface finishing. Furthermore, it is shown that these abrasives increase the lifetime of consumables (magnetorheological fluid and abrasives) and the material removal rate.
68 citations
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TL;DR: Magnetorheological elastomers (MREs) are composed of magnetizable particles (iron particles) and a soft rubber-like matrix as mentioned in this paper, and their mechanical properties, including modulus and damping capability, dep...
Abstract: Magnetorheological elastomers (MREs) are composed of magnetizable particles (iron particles) and a soft rubberlike matrix. Their mechanical properties, including modulus and damping capability, dep...
68 citations
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TL;DR: In this paper, the magnetic properties and morphology of the synthesized magnetic pure carbonyl iron nanoparticles were confirmed via vibration sample magnetometer (VSM) and transmission electron microscopy (TEM) respectively.
Abstract: Magnetorheological (MR) fluids, suspension of magnetic pure carbonyl iron (CI) in non magnetic carrier, were prepared with and without magnetic CI nanoparticle additive in this study. Initially, the magnetic CI nanoparticle additive was synthesized in a rather simple process of decomposition of penta carbonyl iron (Fe(CO)5) using oleyl amine and kerosene. Magnetic property and morphology of the synthesized magnetic CI nanoparticles were confirmed via vibration sample magnetometer (VSM) and transmission electron microscopy (TEM), respectively. MR fluids, prepared as a mixture of pure CI and CI nanoparticle additive of different weight ratio in carrier fluid, was investigated under different external magnetic field strengths via a rotational rheometer. Sedimentation of the MR fluid was characterized by an optical analyzer, Turbiscan. Their flow behaviors at a steady shear mode were examined with and without magnetic CI nanoparticle additive under magnetic field strength. The MR fluids with magnetic CI nanoparticles added demonstrated slightly higher yield behaviors, suggesting that pure CI and CI nanoparticle additive were being oriented in the magnetic field direction under an applied magnetic field and with much strengthened structure.
67 citations
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01 Aug 2002-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the effects of magnetic field strength and temperature on the creep behavior of a magnetorheological fluid under constant stress shear were investigated by using a rheometer with parallel-plate geometry.
Abstract: Creep and recovery behaviors of a magnetorheological (MR) fluid under constant stress shear were investigated. This experiment was accomplished by using a rheometer with parallel-plate geometry. The applied constant stress ranges from a small value to a big one which approaches to the yield stress. The effects of magnetic field strength and the temperature on the creep behavior were addressed. The experimental results indicate that MR fluids behave as linear viscoelastic bodies at small stresses; with increasing constant stresses, nonlinear viscoelastic, viscoplastic, or purely plastic properties will dominate. Hence, MR fluid behavior ranges from predominantly elastic at small stresses to plastic at high stresses. Moreover, the creep and recovery behaviors are explained by a typically thick column structure.
67 citations