scholarly journals The Influence of Additives on the Rheological and Sedimentary Properties of Magnetorheological Fluid

2021 ◽  
Vol 7 ◽  
Author(s):  
Xiangcheng Zhang ◽  
Xiaotong Liu ◽  
Xiaohui Ruan ◽  
Jun Zhao ◽  
Xinglong Gong
Keyword(s):  
Shear Stress ◽  
Magnetic Flux ◽  
Stearic Acid ◽  
Flux Density ◽  
Carbonyl Iron ◽  
Mass Fraction ◽  
Iron Particle ◽  
Magnetorheological Fluid ◽  
Magnetic Flux Density ◽  
Carbonyl Iron Particle

In this research, the influence of additives on the rheological and sedimentary properties of the magnetorheological fluid (MRF) was tested and analyzed. The additives were stearic acid, sodium dodecyl sulfate (SDS), and their mixture, respectively. The MRF was composed of carbonyl iron particle, silicone oil, liquid paraffin, graphite particle, bentonite, stearic acid, and SDS. The results indicated that the rheological properties of the MRF were mainly influenced by the mass fraction of carbonyl iron particle. When the mass fractions of carbonyl iron particle and additive were the same, the shear stress of MRF with stearic acid was larger than that of MRF with SDS, and the maximum increment was 73.81%. When the mass fraction of carbonyl iron particle was 40–50%, the shear stress of MRF increased firstly and then decreased with the increase of the external magnetic flux density. When the mass fraction of carbonyl iron particle was 60–70%, the shear stress of MRF increased firstly and then was stable with the increase of the external magnetic flux density. The results indicated that the sedimentary property of MRF with the mixture was better than that of MRF with the stearic acid and SDS. The settling rate of MRF with the mixture increased 91.53% compared to other additives.

Zirconia-coated carbonyl-iron-particle-based magnetorheological fluid for polishing optical glasses and ceramics

2009 ◽  
Vol 48 (35) ◽  
pp. 6797 ◽  
Author(s):  
Shai N. Shafrir ◽  
Henry J. Romanofsky ◽  
Michael Skarlinski ◽  
Mimi Wang ◽  
Chunlin Miao ◽  
...  
Keyword(s):  
Carbonyl Iron ◽  
Iron Particle ◽  
Magnetorheological Fluid ◽  
Optical Glasses ◽  
Carbonyl Iron Particle

Influence of Different Gradation Carbonyl Iron Particles on the Properties of Magneto-Rheological Fluids

2012 ◽  
Vol 452-453 ◽  
pp. 623-627
Author(s):  
Cheng Bin Du ◽  
Guo Jun Yu ◽  
Zhi Wei Gong
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Shear Stress ◽  
Single Particle ◽  
Carbonyl Iron ◽  
Iron Particle ◽  
Iron Particles ◽  
Carbonyl Iron Particle ◽  
Magneto Rheological ◽  
Multiple Particle

The influence of carbonyl iron particles sizes on the properties of magneto-rheological fluids (MRFs) were studied. Different-sized carbonyl iron magnetic particles were prepared by ball milling with different milling times. On this basis, different particle MRF were prepared The off-state viscosity and the shear stress of the above MRFs were characterised and studied by an advanced rotational rheometer system. The test results show that the off-state viscosity and the shear stress of single-particle MRFs were enhanced with increasing average carbonyl iron particle size at a constant magnetic field. The shear stresses of MRFs containing two or three different particle sizes were significantly improved compared with the MRFs containing only a single particle size. At a reasonable level of medium and small size carbonyl iron particle spread throughout the structure of the multiple-particle MRFs, the defects in the chain structure were remedied when a chain reaction occurred, and the mechanical properties of MRFs were enhanced. Meanwhile, increased mass fractions of the small size carbonyl iron particle resulted in a reduction in overall average particle size of MRFs, and the mechanical properties of MRFs were also reduced. The mechanical properties of multiple-particle MRFs were observed to be strongly dependent on the size and mass fraction of the medium and small carbonyl iron particles.

scholarly journals Properties of plate-like carbonyl iron particle for magnetorheological fluid

2016 ◽  
Vol 776 ◽  
pp. 012033 ◽  
Author(s):  
S. T. Shilan ◽  
S. A. Mazlan ◽  
M. H. A. Khairi ◽  
Ubaidillah
Keyword(s):  
Carbonyl Iron ◽  
Iron Particle ◽  
Magnetorheological Fluid ◽  
Carbonyl Iron Particle

Zirconia coated carbonyl iron particle-based magnetorheological fluid for polishing

2009 ◽  
Author(s):  
Shai N. Shafrir ◽  
Henry J. Romanofsky ◽  
Michael Skarlinski ◽  
Mimi Wang ◽  
Chunlin Miao ◽  
...  
Keyword(s):  
Carbonyl Iron ◽  
Iron Particle ◽  
Magnetorheological Fluid ◽  
Carbonyl Iron Particle

scholarly journals Application of the Taguchi method for finite element analysis of a shear-type magnetorheological fluid damper

2020 ◽  
Vol 12 (4) ◽  
pp. 168781401990039 ◽  
Author(s):  
Dyi-Cheng Chen ◽  
Li-Ren Chen
Keyword(s):  
Magnetic Flux ◽  
Taguchi Method ◽  
Flux Density ◽  
Magnetic Force ◽  
Optimal Parameter ◽  
Magnetorheological Fluid ◽  
Magnetic Flux Density ◽  
Cylinder Wall ◽  
Magnetorheological Fluid Damper ◽  
Fluid Damper

A magnetorheological fluid damper is a device in which a magnetorheological fluid is filled in a damper. In this device, the magnetic field is controlled by an external current (voltage) so that the magnetic force of a piston inside the damper changes like an electromagnet. The damping force of the damper is controlled by changing the magnetic force of the piston. With the increasing magnetic force of the piston, the viscosity of the magnetorheological fluid in the damper increases. The primary aim of this study was to maximize the magnetic flux density and identify the following influencing factors from the relevant literature: piston and outer tube materials, piston length, piston diameter, cylinder wall thickness, damper channel clearance, gap channel length, current, and magnetorheological fluid. A magnetic circuit analysis was performed using ANSYS Maxwell, and the optimal parameter combination was identified using the Taguchi method. The analysis of variance was used to examine the influence of various factors on quality characteristics. This study helps understand the relation between structure size, material, and magnetic flux density and contributes to future generations of magnetorheological fluid damper design analysis.

scholarly journals Investigation of the Effect of Carbonyl Iron Micro-Particles on the Mechanical and Rheological Properties of Isotropic and Anisotropic MREs: Constitutive Magneto-Mechanical Material Model

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1705 ◽  
Author(s):  
Cintya Soria-Hernández ◽  
Luis Palacios-Pineda ◽  
Alex Elías-Zúñiga ◽  
Imperio Perales-Martínez ◽  
Oscar Martínez-Romero
Keyword(s):  
Magnetic Flux ◽  
Rheological Properties ◽  
Flux Density ◽  
Carbonyl Iron ◽  
Material Model ◽  
Magnetic Flux Density ◽  
Stress Softening ◽  
Permanent Set ◽  
Micro Particles ◽  
Constitutive Material Model

This article focuses on evaluating the influence that the addition of carbonyl iron micro-particles (CIPs) and its alignment have on the mechanical and rheological properties for magnetorheological elastomers (MREs) fabricated using polydimethylsiloxane (PDMS) elastomer, and 24 wt % of silicone oil (SO). A solenoid device was designed and built to fabricate the corresponding composite magnetorheological material and to perform uniaxial cyclic tests under uniform magnetic flux density. Furthermore, a constitutive material model that considers both elastic and magnetic effects was introduced to predict stress-softening and permanent set effects experienced by the MRE samples during cyclic loading tests. Moreover, experimental characterizations via Fourier transform infrared (FTIR), X-ray diffraction (XRD), tensile mechanical testing, and rheological tests were performed on the produced MRE samples in order to assess mechanical and rheological material properties such as mechanical strength, material stiffness, Mullins and permanent set effects, damping ratio, stiffness magnetorheological effect (SMR), and relative magnetorheological storage and loss moduli effects. Experimental results and theoretical predictions confirmed that for a CIPs concentration of 70 wt %, the material samples exhibit the highest shear modulus, stress-softening effects, and engineering stress values when the samples are subject to a maximum stretch value of 1.64 and a uniform magnetic flux density of 52.2 mT.

Test Method for Rheological Behaviors of Magnetorheological Grease Based on Coaxial Cylinder Shear Mode and Rheometer

2011 ◽  
Vol 291-294 ◽  
pp. 1929-1934
Author(s):  
Li Juan Fu ◽  
Chang Rong Liao ◽  
Jian Zuo Ma
Keyword(s):  
Shear Stress ◽  
Angular Velocity ◽  
Magnetic Flux ◽  
Flux Density ◽  
Coaxial Cylinder ◽  
Approximate Algorithm ◽  
Magnetic Flux Density ◽  
Shear Mode ◽  
Rheological Behaviors ◽  
Test Methodology

A test methodology for rheological behaviors of MR greases based on double rotational coaxial cylinder shear mode is presented in this paper. Both flow velocity profiles and shear stress profiles of MR greases in shear channels are analytically explored. The theory relationship between shear stress acted on MR greases and transmission torques is established, an approximate algorithm is put forwarded to acquire nominal shear stresses by transmission torques. On the basis of differential equation and its rational boundary conditions from stress equilibrium of MR greases micro-unit, an approximate corresponding algorithm is worked out for nominal shear strain rates by rotor angular velocities. The relationship between average value of magnetic flux density in annular channels and excitation electrical currents are experimentally obtained. Based on test methodology above-mentioned, a rheometer is fabricated and modulated, in which torque sensor, angular velocity sensor and ampere meter are respectively used to test transmission torque, angular velocity and electrical current. Rheological parameters of MR grease from the rheometer, whose shear rate is more than 2000 1/s and magnetic flux density acting on MR greases exceed 0.6T, are in good agreement with those from test conduced by commercial theological rheometer.

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