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Journal articles on the topic 'MR rheometer'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Chen, Bing San, Ji Bin Jiang, and Fu Jiang Zhang. "Studying on the Magnetorheological Fluids and its Rheometer." Advanced Materials Research 230-232 (May 2011): 1396–401. http://dx.doi.org/10.4028/www.scientific.net/amr.230-232.1396.

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This paper presents a magnetorheological(MR) rheometer which consists of a pair of rotating parallel disc, step motor, the signal collecting device, computer software for dynamic analysis etc.. In order to assess the performance of the MR rheometer, high-order spectrum analysis tools are used. The theoretical and experimental results indicate that the rheometer is useful to test the dynamic charicteristics of the MR fluids and the high-order analysis might be helpful to describe MR rheometer dynamic characteristics. The measurement and analysis process based on virtual instruments are automati

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2

Fu, Li Juan, Chang Rong Liao, and Jian Zuo Ma. "Test Method for Rheological Behaviors of Magnetorheological Grease Based on Coaxial Cylinder Shear Mode and Rheometer." Advanced Materials Research 291-294 (July 2011): 1929–34. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.1929.

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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 approximat

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3

ULICNY, JOHN C., and MARK A. GOLDEN. "EVALUATION OF YIELD STRESS MEASUREMENT TECHNIQUES ON A PARALLEL PLATE MAGNETIC RHEOMETER." International Journal of Modern Physics B 21, no. 28n29 (2007): 4898–906. http://dx.doi.org/10.1142/s0217979207045815.

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The on-state yield stress is the primary design parameter for an MR actuator. We have evaluated several methods for measuring yield stress on a number of MR fluids of varying composition using a commercial parallel plate magnetic rheometer. The data obtained by these methods is evaluated for reproducibility and sensitivity to sample size variation and is compared against data obtained with a concentric cylinder magnetic rheometer and literature results. Based on these evaluations and comparisons, we selected two tests for further evaluation.

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4

MANTRIPRAGADA, S., X. WANG, F. GORDANINEJAD, B. HU, and A. FUCHS. "RHEOLOGICAL PROPERTIES OF NOVEL MAGNETORHEOLOGICAL FLUIDS." International Journal of Modern Physics B 21, no. 28n29 (2007): 4849–57. http://dx.doi.org/10.1142/s021797920704575x.

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The rheological properties of novel MR fluids are characterized using a parallel plate MR shear rheometer. In these MR fluids the surface of iron particles is coated with a polymer. The rheological properties are measured and compared at various magnetic field strengths, shear rates and strain amplitudes. It has been shown that these MR fluids exhibit stable and desirable rheological properties such as, low viscosity and high yield stress.

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5

Zhang, Xian Zhou, and Wei Hua Li. "Investigation of Bimodal Particles Based Magnetorheological Elastomers." Advanced Materials Research 32 (February 2008): 165–68. http://dx.doi.org/10.4028/www.scientific.net/amr.32.165.

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This paper presents the study of rheological and mechanical properties of MR elastomers fabricated using small and large particle. Analysis indicated that MR elastomers fabricated with bimodal particles at a specific particle ratio ingredient show enhanced MR effect compared with those fabricated with monoparticles. MR elastomer samples were fabricated by using small and large particles with sizes of 5m and 50m respectively. Their rheological and mechanical properties were characterized with a MR rheometer. Experimental results agree well with the analysis.

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6

Kolekar, Shreedhar. "Preparation of Magnetorheological Fluid and Study on Its Rheological Properties." International Journal of Nanoscience 13, no. 02 (2014): 1450009. http://dx.doi.org/10.1142/s0219581x14500094.

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The present paper focuses on preparation and process of the magnetorheological (MR) fluid whose carrier fluid is silicone-based oil and its additive is the commercial grease with different concentration of iron particles. General properties of MR fluid are discussed and rheological properties like shear rate, shear stress, viscosity of MR fluid can be found by using cone-and-plate sensor system-type rheometer. The result shows that shear stress as a function of magnetic flux density and viscosity does not strictly scale with iron loading.

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7

Cho, Min Seong, and Hyoung Jin Choi. "Magnetorheological Characterization of Polymer-Iron Composite Suspensions." Materials Science Forum 449-452 (March 2004): 1201–4. http://dx.doi.org/10.4028/www.scientific.net/msf.449-452.1201.

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Composite particles (CIPMMA) of carbonyl iron (CI) and poly (methyl methacrylate) (PMMA) were prepared by a suspension polymerization method using CI dispersions in MMA monomer, and these were adopted as dispersed phase of magnetorheological (MR) fluids. The CIPMMA can resolve several problems of MR fluids having CI alone such as severe sedimentation and poor dispersion stability. Flow and viscelastic properties of the MR fluids were analyzed via a rotational rheometer equipped with a magnetic field supplier using measuring system of a parallel plate. The MR characteristics like yield stress w

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8

Utami, Dewi, Saiful Amri Mazlan, Ubaidillah, Irfan Bahiuddin, Fitrian Imaduddin, and Nur Azmah Nordin. "The Changed of Behaviour of MR Fluid in MR Damper after a Long-Term Operation." Key Engineering Materials 775 (August 2018): 171–76. http://dx.doi.org/10.4028/www.scientific.net/kem.775.171.

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Magnetorheological (MR) fluid devices are now applied in various applications. Although a lot of studies have been discussed in long-term implementation of MR devices, only few studies have concerned on MR fluid application in valve operation mode, such as at MR valve. The experiments were conducted on a dynamic test machine in a custom MR damper with meandering MR valve. The experiment test was applied at continuous-load in long term-operation with parameters of 20 mm length of stroke, 0.4 Hz of frequency, 0.5 A of applied current and 175,000 cycles. The rheological properties of MR fluid wer

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9

Nugroho, Kacuk Cikal, Wahid Sidik Sarifuddin, Budi Purnama, Ubaidillah, Nur Azmah Nordin, and Saiful Amri Bin Mazlan. "Effect of Hard Magnetic CoFe₂O₄ Nanoparticles Additives on Improving Rheological Properties and Dispersion Stability of Magnetorheological Fluids." Key Engineering Materials 855 (July 2020): 89–95. http://dx.doi.org/10.4028/www.scientific.net/kem.855.89.

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Increasing dispersion stability is the main issue in recent research at magnetorheological (MR) fluids. The presentation of nanoparticle addictive in MR fluids is an effective method not only to increase dispersion stability but also increasing performance in MR fluids. In this study, the effect of hard magnetic CoFe2O4 nanoparticles addition on rheological properties and dispersion stabilization had been studied. Rheological properties were investigated using a rheometer at room temperature. The result showed that the addition of CoFe2O4 nanoparticles 1wt% in particles of MR fluids were impro

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10

FANG, F. F., B. J. PARK, H. J. CHOI, and W. S. AHN. "MAGNETORHEOLOGY OF CARBONYL-IRON SUSPENSION WITH IRON/MCM-41 ADDITIVE." International Journal of Modern Physics B 21, no. 28n29 (2007): 4981–87. http://dx.doi.org/10.1142/s021797920704592x.

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Iron containg hexagonal mesoporous silica particle ( Fe - MCM -41) was prepared and adopted into carbonyl-iron ( CI ) based magnetorheological (MR) suspension as an additive to improve the sedimentation problem of the CI based MR fluid. Structural properties and morphology of the synthesized Fe - MCM -41 particles were observed using SEM. Their MR properties such as oscillation characteristics and flow response (shear stress and shear viscosity) were examined via a rotational rheometer in parallel plate geometry equipped with a magnetic field supplier under external magnetic field strengths ra

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11

FANG, FEI FEI, JI HYE KIM, and HYOUNG JIN CHOI. "MAGNETORHEOLOGICAL CHARACTERIZATION OF HOLLOW POLYMER/MAGNETITE MICROSPHERICAL COMPOSITE." International Journal of Modern Physics B 23, no. 17 (2009): 3613–18. http://dx.doi.org/10.1142/s0217979209063067.

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Magnetorheological (MR) suspensions, composed of colloidal particles dispersed in a carrier liquid, possess tunable rheological characteristics by applying an external magnetic field, showing dramatic changes of yield stress and shear viscosity caused by transformation between solid-like to liquid-like state. As a new MR material, we synthesized hollow polystyrene/magnetite (PS/Fe3O4) microspherical composite. Morphology of the PS obtained and the loaded magnetite were examined via SEM, and TGA spectra confirmed the composition. Magnetic property was tested by VSM data. MR characteristics of M

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12

Farjoud, Alireza, Ryan Cavey, Mehdi Ahmadian, and Chandra Namuduri. "Non-dimensional modeling and experimental evaluation of a MR squeeze mode rheometer." Journal of Physics: Conference Series 149 (February 1, 2009): 012048. http://dx.doi.org/10.1088/1742-6596/149/1/012048.

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13

Rahman, Nor Azlin Nazira Abd, Saiful Amri Mazlan, Siti Aishah Abdul Aziz, Nur Azmah Nordin, Ubaidillah, and N. Hapipi. "Magnetorheological Elastomer Silicone-Based Containing Corroded Carbonyl Iron Particles." Key Engineering Materials 772 (July 2018): 51–55. http://dx.doi.org/10.4028/www.scientific.net/kem.772.51.

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In this study, magnetorheological elastomers (MREs) were synthesized using silicone rubber (SR) as the matrix element interspersed with 70 weight percent of corroded carbonyl iron particles (CIPs). The CIPs were corroded in dilute hydrochloric acid (HCl) for 4 hours. The rheological properties related to MR effect were experimentally examined in the absence and presence of magnetic field at various current using a rheometer. The experimental results depicted the MR effect of the MRE with corroded CIPs decreased one-half, 27% as compared to the non-corroded samples, 58%. The correlation between

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14

LI, W. H., P. Q. ZHANG, X. L. GONG, and P. B. KOSASIH. "LINEAR VISCOELASTICITY OF MR FLUIDS: DEPENDENCE ON MAGNETIC FIELDS." International Journal of Modern Physics B 19, no. 07n09 (2005): 1198–204. http://dx.doi.org/10.1142/s0217979205030062.

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The paper presents investigation of dynamic properties of MR fluids by using a rheometer with parallel-plate geometry. The sample is reduced iron powder based MR suspensions. Linear viscoelastic properties of such sample, which can be variably controlled using a magnetic field, are obtained and summarized based on oscillatory tests. Four field-induced regimes, I, II, III, and IV, are found in the system, which are defined by three critical field strengths: BC1< BC2< BC3. MR fluids in regime I through IV experience four typical structural convolutions: coexisting of particles and random c

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15

Fu, Yu, Jianjun Yao, Honghao Zhao, Gang Zhao, Zhenshuai Wan, and Ying Qiu. "Bidisperse Magnetic Particles Coated with Gelatin and Graphite Oxide: Magnetorheology, Dispersion Stability, and the Nanoparticle-Enhancing Effect." Nanomaterials 8, no. 9 (2018): 714. http://dx.doi.org/10.3390/nano8090714.

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The magnetorheology and dispersion stability of bidisperse magnetic particles (BMP)-based magnetorheological (MR) fluids were improved by applying a novel functional coating composed of gelatin and graphite oxide (GO) to the surfaces of the micron-sized carbonyl iron (CI) and nanoparticles Fe3O4. Gelatin acted as a grafting agent to reduce the aggregation and sedimentation of CI particles and prevent nanoparticles Fe3O4 from oxidation. In addition, a dense GO network on the surface of gelatin-coated BMP was synthesized by self-assembly to possess a better MR performance and redispersibility. T

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16

LI, W. H., G. CHEN, S. H. YEO, and H. DU. "TEMPERATURE DEPENDENCE OF MR FLUIDS." International Journal of Modern Physics B 16, no. 17n18 (2002): 2725–31. http://dx.doi.org/10.1142/s0217979202012906.

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The rheological properties of MR fluids, MRF-132LD, are investigated under the steady shear and oscillatory shear for a range of operating temperatures from 20°C to 60°C. This was accomplished by using an advanced rheometer with the parallel-plate configuration. Under the steady shear, the Herschel–Bulkley model is used to model the rheology of the MR fluid. The corresponding parameters namely, τyd, K and n were determined at various temperatures, in an attempt to minimize the discrepancies between the experimental results and that predicted by the model. The results show that τyd, K and n all

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17

Sarkar, Chiranjit, and Harish Hirani. "Experimental studies on magnetorheological brake containing plane, holed and slotted discs." Industrial Lubrication and Tribology 69, no. 2 (2017): 116–22. http://dx.doi.org/10.1108/ilt-12-2015-0205.

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Purpose This study aims to design an ideal magnetorheological (MR) brake that exerts negligible frictional torque in the off-state condition and controllable frictional torque in the on-state condition. Design/methodology/approach Silicone-based MR fluid, containing 9 per cent volume carbonyl iron particles, has been synthesized and used. The synthesized MR fluid is advantageous in maintaining low friction losses in off-state conditions. A magneto-rheometer has been utilized to characterize the off-state viscosity of the MR fluid at variable shear rates and shear stress of MR fluids at various

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18

Sapiński, Bogdan, and Wojciech Horak. "RHEOLOGICAL PROPERTIES OF MR FLUIDS RECOMMENDED FOR USE IN SHOCK ABSORBERS." Acta Mechanica et Automatica 7, no. 2 (2013): 107–10. http://dx.doi.org/10.2478/ama-2013-0019.

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Abstract The paper summarises the results of laboratory testing of rheological behaviour of (magnetorheological) MR fluids designed for use in shock absorber and vibration dampers. The experiments used a rotational rheometer with an extra chamber inside which a uniform magnetic field can be generated. Underlying the description of rheological properties of fluids is the Herschel-Bulkley’s model of viscous- plastic substances. The aim of the experiment was to determine the shear stress, yield stress, the yield factor and the power-law exponent depending on the magnetic flux density, followed by

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19

Han, Young Min, Quoc Hung Nguyen, Seung Bok Choi, and Kyung Su Kim. "Hysteretic Behaviors of Yield Stress in Smart ER/MR Materials: Experimental Results." Key Engineering Materials 326-328 (December 2006): 1459–62. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.1459.

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This paper experimentally investigates the hysteretic behaviors of yield stress in electrorheological (ER) and magnetorheological (MR) materials which are known as smart materials. As a first step, the PMA-based ER material is prepared by dispersing the chemically synthesized polymethylaniline (PMA) particles into non-conducting oil. For the MR material, commercially available one (Lord MRF-132LD) is chosen for the test. Using the rheometer, the torque resulting from the shear stress of the ER/MR materials is measured, and then the yield stress is calculated from the measured torque. In order

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20

You, Jae Lim, B. J. Park, I. B. Jang, and Hyoung Jin Choi. "Encapsulation of Carbonyl Iron Particles with Poly(Vinyl Butyral) and their Magnetorheology." Key Engineering Materials 334-335 (March 2007): 193–96. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.193.

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To enhance dispersion stability of magnetorheological (MR) fluids, hybrid magnetic particles of carbonyl iron (CI)/ poly(vinyl butyral) (PVB) with core/shell microstrcutre (CI-PVB) were prepared, since pure magnetic CI based MR fluid systems show severe sedimentation of the CI particles due to the large density mismatch with the carrier liquid and difficulties in redispersion after caking. The composite particles of CI-PVB have a lower density than that of the pure CI particles, while exhibiting almost original magnetic property of the CI. Both CI and CI-PVB particles were dispersed in mineral

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21

Ciocanel, Constantin, Kevin Molyet, Hideki Yamamoto, Sheila L. Vieira, and Nagi G. Naganathan. "Magnetorheological Fluid Behavior Under Constant Shear Rates and High Magnetic Fields Over Long Time Periods." Journal of Engineering Materials and Technology 128, no. 2 (2005): 163–68. http://dx.doi.org/10.1115/1.2172276.

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This paper presents a new magnetorheological (MR) cell design along with a study of the magnetic field, shear rate, and time/shear strain influences on the properties and behavior of a MR fluid tested for long periods of time. The MR cell was designed to adapt a commercially available rheometer to measure the rheological properties of the fluid. Overall characteristics of the designed MR cell output capability are provided. Constant shear rate tests, two hours in duration, have been performed at shear rates between 0.1l∕s and 200l∕s under magnetic field intensities up to 0.4T. The rheological

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22

YANG, Y. B., G. CHEN, L. LI, and W. H. LI. "ON THE EXTENDED RUTGERS–DELAWARE RULE FOR MR SUSPENSIONS UNDER MAGNETIC FIELDS." International Journal of Modern Physics B 20, no. 05 (2006): 579–92. http://dx.doi.org/10.1142/s0217979206033449.

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The interrelation between apparent viscosity in steady shear flow and complex viscosity in oscillatory shear flow for magnetorheological (MR) suspensions is investigated. Series of experiments have been conducted using a MR rheometer. An extended Rutgers–Delaware rule is proposed, in which an effective shear rate for oscillatory shear flow is defined as ωΔh. Here ωΔh is the shift factor dependent on strain amplitude (γ0), which was found to be similar for different MR suspensions under different magnetic fields. At high strain amplitudes (γ0≥100%), Δh≈γ0, the Rutgers–Delaware rule is approxima

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YOU, J. L., B. J. PARK, H. J. CHOI, S. B. CHOI, and M. S. JHON. "PREPARATION AND MAGNETORHEOLOGICAL CHARACTERIZATION OF CI/PVB CORE/SHELL PARTICLE SUSPENDED MR FLUIDS." International Journal of Modern Physics B 21, no. 28n29 (2007): 4996–5002. http://dx.doi.org/10.1142/s0217979207045943.

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Hybrid magnetic particles of carbonyl iron ( CI ) /poly(vinyl butyral) ( PVB ) with core/shell microstructure ( CI - PVB ) were prepared in order to enhance the dispersion stability of the magnetorheological (MR) fluids. Since the composite particles of CI - PVB have a lower density than that of the pristine CI particles, they are regarded to improve the sedimentation problem of magnetic particles in the MR fluid when the particles are dispersed in a mineral oil and to make easy redispersion after caking. The PVB coating layers were found to play an important role in the steric repulsion betwe

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24

Nakano, Masami, Hideki Yamamoto, and Mark R. Jolly. "Dynamic Viscoelasticity of a Magnetorheological Fluid in Oscillatory Slit Flow." International Journal of Modern Physics B 13, no. 14n16 (1999): 2068–76. http://dx.doi.org/10.1142/s0217979299002150.

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The nonlinear dynamic viscoelasticity of an MR fluid in oscillatory slit flow under magnetic flux normal to the flow has been investigated by using a newly developed oscillatory pressure flow type rheometer. An MR fluid consisting of micron-sized, magnetically polarizable particles dispersed into a carrier medium is evaluated. The dynamic viscoelasticity remarkably depends on a fluid strain amplitude and a magnetic field strength. Both of the storage modulus (G′) and loss modulus (G″) increase dramatically with the increase of applied magnetic field strength H from 0 to 160 kA/m. And for the i

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25

Khairi, Muntaz Hana Ahmad, Saiful Amri Mazlan, Ubaidillah, Siti Aishah Abdul Aziz, and Norhiwani Mohd Hapipi. "Performance of Magnetorheological Elastomer Based Silicone/SAIB." Key Engineering Materials 772 (July 2018): 61–65. http://dx.doi.org/10.4028/www.scientific.net/kem.772.61.

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This study introduces a sucrose acetate isobutyrate (SAIB) as an additive of magnetorheological elastomers (MREs) to be added in silicone rubber matrix and carbonyl iron particles (CIPs) as their filler. The CIPs were fixed at 60 wt% and two types of MREs sample were fabricated which are isotropic and anisotropic. Rheological properties related to shear storage modulus were measured using a rheometer (MCR 302, Anton Paar). The experimental results demonstrated that the magnetorheological (MR) effect of anisotropic MREs-based Silicone/SAIB was 126 % as compared to isotropic MREs-based Silicone/

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26

CHAUDHURI, A., G. WANG, N. M. WERELEY, VASIL TASOVKSI, and R. RADHAKRISHNAN. "SUBSTITUTION OF MICRON BY NANOMETER SCALE POWDERS IN MAGNETORHEOLOGICAL FLUIDS." International Journal of Modern Physics B 19, no. 07n09 (2005): 1374–80. http://dx.doi.org/10.1142/s0217979205030323.

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The effects of substitution of micron size powder by nanometer size powder in magnetorheological (MR) fluids are investigated in this study. Three MR fluid samples containing iron powder with 45% weight fraction in a carrier fluid were made by Materials Modification Inc. The difference among these three fluids is size of the magnetic particles. The first MR fluid sample contained only micron size iron powder with 10μm particle size. In the second sample, 5% micron iron was substituted with nano powders having 30~40nm mean diameter, while the third sample had 37.5% micron powder and 7.5% nano p

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27

HU, WEI, and NORMAN M. WERELEY. "BEHAVIOR OF MR FLUIDS AT HIGH SHEAR RATE." International Journal of Modern Physics B 25, no. 07 (2011): 979–85. http://dx.doi.org/10.1142/s0217979211058535.

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The high shear rate behavior of MR fluids is investigated using a concentric rotational cylinder viscometer fabricated in-house. The rotational cylinder viscometer is designed such that a high shear rate of up to 30,000 s-1 can be applied to the MR fluid in a pure shear flow mode. As a comparison, the maximum shear rate of a commercially available parallel disk type rheometer is only up to 1,000 s-1. To determine the shear rate of the MR fluid in the viscometer, an exact expression between torque and angular velocity is established. The yield stress and viscosity of the MR fluid is determined

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28

Lee, Jin, Qi Lu, Jae Lee, and Hyoung Choi. "Polymer-Magnetic Composite Particles of Fe3O4/Poly(o-anisidine) and Their Suspension Characteristics under Applied Magnetic Fields." Polymers 11, no. 2 (2019): 219. http://dx.doi.org/10.3390/polym11020219.

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Fe3O4/poly(o-anisidine) (POA) magnetic composite nanoparticles with their core-shell structure were synthesized by chemical oxidation polymerization technique and adopted as a magneto-responsive magnetorheological (MR) material. The chemical structure and morphology of core-shell nanoparticles were identified by FT-IR, SEM, TEM, and elemental analyzer. Pycnometer and vibrating sample magnetometer showed that the magnetic saturation and density of the Fe3O4/POA particles were reduced by the POA shell coatings. The rheological properties of the MR suspension dispersed in a silicone oil at variou

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ROSENFELD, NICHOLAS, NORMAN M. WERELEY, RADHAKUMAR RADAKRISHNAN, and TIRULAI S. SUDARSHAN. "BEHAVIOR OF MAGNETORHEOLOGICAL FLUIDS UTILIZING NANOPOWDER IRON." International Journal of Modern Physics B 16, no. 17n18 (2002): 2392–98. http://dx.doi.org/10.1142/s0217979202012414.

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Iron nanopowders for use in magnetorheological (MR) fluids were synthesized using a Microwave Plasma Synthesis technique developed at Materials Modification Inc (Fairfax VA). Transmission electron microscopy and surface area analysis measured iron particle size at 15–25 nm. The nanopowders were mixed into hydraulic oil to create nano-scale MR fluid. A micro-scale fluid was created using 45 μm iron particles as well as a hybrid fluid using a 50/50 mix of micro- and nanoparticles. All three fluids had a solids loading of 60% (w/w or weight by weight fraction). The fluids were tested in a flow mo

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GONCALVES, FERNANDO D., and J. DAVID CARLSON. "INVESTIGATING THE TIME DEPENDENCE OF THE MR EFFECT." International Journal of Modern Physics B 21, no. 28n29 (2007): 4832–40. http://dx.doi.org/10.1142/s0217979207045736.

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Magnetorheological fluids are known to respond in a matter of milliseconds to the application of a magnetic field. To date, however, very little work has been done to study the time dependence of the MR response. The purpose of this study is to investigate the response time of the fluid. Experiments were conducted on a high shear rate rheometer capable of fluid speeds in excess of 35 m/s. With an MR valve length of 6.35 mm, the resulting dwell times were as low as 0.18 ms. For each of three magnetic field strengths, a reduction in yield stress is observed as dwell time decreases. A model is pr

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31

K.P., Lijesh, Deepak Kumar, and Harish Hirani. "Synthesis and field dependent shear stress evaluation of stable MR fluid for brake application." Industrial Lubrication and Tribology 69, no. 5 (2017): 655–65. http://dx.doi.org/10.1108/ilt-03-2016-0061.

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Purpose The purpose of this paper is to report on the development of magnetorheological (MR) fluids, having high on-state shear stress/viscosity, low off-state shear stress/viscosity, good redispersibility and stable suspension of carbonyl iron particles, using tetramethyl ammonium hydroxide (TAH) and oleic acid. Design/methodology/approach MR fluids for use in brakes are synthesized using different weight percentages of silicone oil, TAH, oleic acid and iron particles. The effects of TAH and oleic acid are studied. Shear stress is measured as a function of magnetic field on a magneto-rheomete

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32

NGATU, G. T., and N. M. WERELEY. "HIGH VERSUS LOW FIELD VISCOMETRIC CHARACTERIZATION OF BIDISPERSE MR FLUIDS." International Journal of Modern Physics B 21, no. 28n29 (2007): 4922–28. http://dx.doi.org/10.1142/s0217979207045840.

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Our bidisperse magnetorheological fluids are suspensions of micron (2-10μm) and nanometer (~40nm) scale magnetic iron particles in silicone or hydraulic oil. Earlier studies were conducted to determine the yield stress of these fluids at low magnetic field induction. These studies have shown the absence of saturation yield stress implying the possibility of a higher yield stress by increasing the applied field. In this study, three different bidisperse MR fluids were investigated to determine the maximum available yield stress that can be obtained at or near saturation magnetic flux density. T

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33

Wang, Kejie, Xiaomin Dong, Junli Li, Kaiyuan Shi, and Keju Li. "Effects of Silicone Oil Viscosity and Carbonyl Iron Particle Weight Fraction and Size on Yield Stress for Magnetorheological Grease Based on a New Preparation Technique." Materials 12, no. 11 (2019): 1778. http://dx.doi.org/10.3390/ma12111778.

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This paper investigated the effects of silicone oil viscosity (SOV) and carbonyl iron particle (CIP) weight fraction and size on dynamic yield stress for magnetorheological (MR) grease. The MR grease samples were prepared using orthogonal array L9 on the basis of a new preparation technology. The shear rheological tests were undertaken using a rotational shear rheometer and yield stress was obtained based on the Bingham fluid model. It was found that CIP fractions ranging from 65 wt% to 75 wt% and SOV varying from 50 m2·s−1 to 1000 m2·s−1 significantly affect the magnetic field-dependent yield

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GONCALVES, F. D., M. AHMADIAN, and J. D. CARLSON. "BEHAVIOR OF MR FLUIDS AT HIGH VELOCITIES AND HIGH SHEAR RATES." International Journal of Modern Physics B 19, no. 07n09 (2005): 1395–401. http://dx.doi.org/10.1142/s0217979205030359.

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The objective of this work is to characterize the performance of MR fluid at high shear rates and high velocities. A slit-flow rheometer has been built which allows for high speed testing of MR fluid under varying field strengths. Fluid velocities range from 3.9 m/s to 27 m/s with resulting shear rates ranging from 0.23×105 s -1 to 1.6×105 s -1. In order to evaluate the performance of the fluid, the force required to drive the fluid through the slit is measured and force-velocity characteristics are generated. The zero-field viscosity is found and results indicate that shear thinning is still

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LI, W. H., G. CHEN, S. H. YEO, and H. DU. "STRESS RELAXATION OF MAGNETORHEOLOGICAL FLUIDS." International Journal of Modern Physics B 16, no. 17n18 (2002): 2655–61. http://dx.doi.org/10.1142/s0217979202012803.

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In this paper, the experimental and modeling study and analysis of the stress relaxation characteristics of magnetorheological (MR) fluids under step shear are presented. The experiments are carried out using a rheometer with parallel-plate geometry. The applied strain varies from 0.01% to 100%, covering both the pre-yield and post-yield regimes. The effects of step strain, field strength, and temperature on the stress modulus are addressed. For small step strain ranges, the stress relaxation modulus G(t,γ) is independent of step strain, where MR fluids behave as linear viscoelastic solids. Fo

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Kim, Hoyeon, Sehyun Kim, and Yongsok Seo. "High-Performance Magnetorheological Suspensions of Fe3O4-deposited Carbon Nanotubes with Enhanced Stability." MRS Advances 4, no. 3-4 (2019): 217–24. http://dx.doi.org/10.1557/adv.2019.109.

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AbstractThe magnetorheological (MR) performance of suspensions based on the Fe3O4-deposited carbon nanotubes (CNTs) was investigated by using a vibrating sample magnetometer (VSM) and a rotational rheometer. The Fe3O4-deposited CNTs were synthesized by the reduction process in which nano-Fe3O4 nanoparticles were generated and adsorbed on the surface of CNTs. All tested suspensions displayed excellent MR behaviors with high yield strengths. The morphology was observed by scanning electron microscope (SEM) and transmission electron microscope (TEM). It was revealed that Fe3O4 particles adsorbed

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D'Souza, Nandika Anne, and Zheng Tao Yang. "Magnetorheology of Multiwalled Nanotube Dispersions in Mineral Oil." Journal of Nano Research 1 (January 2008): 40–49. http://dx.doi.org/10.4028/www.scientific.net/jnanor.1.40.

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The magnetorheological (MR) effect of multi-walled carbon nanotubes (MWNT) was investigated. Three concentrations of MWNT were dispersed in mineral oil (0.5, 1.5 and 2.53 vol% nanotubes). Rheological investigations were conducted on a magnetorheological cell coupled to a controlled stress rheometer. Oscillatory tests and rotational tests were conducted. A sinuisoidal strain between 0 and 1 with a frequency of 1 Hz was applied and the stress amplitude measured for 0, 171 and 343 kA/m magnetic field strengths. Linear viscoelasticity was determined to exist at strains less than 5%. Dynamic freque

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Liu, Minzi, Mei Zhang, Jiangtao Zhang, Yanliang Qiao, and Pengcheng Zhai. "Experimental Investigation on the Effect of Graphene Oxide Additive on the Steady-State and Dynamic Shear Properties of PDMS-Based Magnetorheological Elastomer." Polymers 13, no. 11 (2021): 1777. http://dx.doi.org/10.3390/polym13111777.

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Isotropic polydimethylsiloxane (PDMS)-based magnetorheological elastomers (MREs) filled with various contents of graphene oxide (GO) additive were fabricated by the solution blending-casting method in this work. The morphologies of the produced MREs were characterized, and the results indicate that the uniform distribution of GO sheets and carbonyl iron particles (CIPs) becomes difficult with the increase of GO content. The steady-state and dynamic shear properties of the MREs under different magnetic field strengths were evaluated using parallel plate rheometer. It was found that the physical

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Sánchez-Puga, Pablo, Javier Tajuelo, Juan Pastor, and Miguel Rubio. "Dynamic Measurements with the Bicone Interfacial Shear Rheometer: Numerical Bench-Marking of Flow Field-Based Data Processing." Colloids and Interfaces 2, no. 4 (2018): 69. http://dx.doi.org/10.3390/colloids2040069.

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Flow field-based methods are becoming increasingly popular for the analysis of interfacial shear rheology data. Such methods take properly into account the subphase drag by solving the Navier–Stokes equations for the bulk phase flows, together with the Boussinesq–Scriven boundary condition at the fluid–fluid interface and the probe equation of motion. Such methods have been successfully implemented on the double wall-ring (DWR), the magnetic rod (MR), and the bicone interfacial shear rheometers. However, a study of the errors introduced directly by the numerical processing is still lacking. He

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Mohamad, Norzilawati, Ubaidillah, Saiful Mazlan, Seung-bok Choi, Siti Abdul Aziz, and Masataka Sugimoto. "The Effect of Particle Shapes on the Field-Dependent Rheological Properties of Magnetorheological Greases." International Journal of Molecular Sciences 20, no. 7 (2019): 1525. http://dx.doi.org/10.3390/ijms20071525.

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The transient response of magnetorheological (MR) materials, in general, is very important for design consideration in MR-based devices. Better response to magnetic fields is beneficial for a better response rate to the electrical current applied in the electromagnetic coil. As a result, MR-based devices would have a high response to external stimuli. In this work, the principal characteristics of magnetorheological greases (MRGs) which have two different particle shapes are experimentally investigated. One type of particle distributed in the grease medium is conventional spherical-shaped carb

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BELL, R. C., E. D. MILLER, J. O. KARLI, A. N. VAVRECK, and D. T. ZIMMERMAN. "INFLUENCE OF PARTICLE SHAPE ON THE PROPERTIES OF MAGNETORHEOLOGICAL FLUIDS." International Journal of Modern Physics B 21, no. 28n29 (2007): 5018–25. http://dx.doi.org/10.1142/s0217979207045979.

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We present studies of the rheological properties and dispersion stability of MR fluids as a function of particle shape by comparing fluids made with uniform nickel spheres to those employing nickel microwires suspended in silicone oil. The wires were fabricated using template-based electrodeposition having diameters in the range 300 ± 30 nm and lengths in the range of 5 – 25 μm . The properties of these wires were compared to commercial nickel carbonyl spheres (1–10 μm dia.). Qualitatively, the off-state (field off) viscosity of fluids containing only wires was found to be substantially greate

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Khairi, Fatah, Mazlan, et al. "Enhancement of Particle Alignment Using Silicone Oil Plasticizer and Its Effects on the Field-Dependent Properties of Magnetorheological Elastomers." International Journal of Molecular Sciences 20, no. 17 (2019): 4085. http://dx.doi.org/10.3390/ijms20174085.

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The existing mold concept of fabricating magnetorheological elastomer (MRE) tends to encounter several flux issues due to magnetic flux losses inside the chamber. Therefore, this paper presents a new approach for enhancing particle alignment through MRE fabrication as a means to provide better rheological properties. A closed-loop mold, which is essentially a fully guided magnetic field inside the chamber, was designed in order to strengthen the magnetic flux during the curing process with the help of silicone oil (SO) plasticizers. The oil serves the purpose of softening the matrix. Scanning

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Shabdin, Muhammad, Mohd Abdul Rahman, Saiful Mazlan, et al. "Material Characterizations of Gr-Based Magnetorheological Elastomer for Possible Sensor Applications: Rheological and Resistivity Properties." Materials 12, no. 3 (2019): 391. http://dx.doi.org/10.3390/ma12030391.

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Considering persistent years, many researchers continuously seek an optimum way to utilize the idea of magnetorheology (MR) materials to be practically used for everyday life, particularly concerning resistivity sensing application. The rheology and resistivity of a graphite (Gr)-based magnetorheological elastomer (Gr-MRE) were experimentally evaluated in the present research. Magnetorheological elastomer (MRE) samples were prepared by adding Gr as a new additive during MRE fabrication. The effect of additional Gr on the rheological and resistivity properties were investigated and compared wit

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Laun, H. Martin, Claudius Kormann, and Norbert Willenbacher. "Rheometry on magnetorheological (MR) fluids." Rheologica Acta 35, no. 5 (1996): 417–32. http://dx.doi.org/10.1007/bf00368993.

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Wang, Hong Yun, and Hui Qiang Zheng. "Shear and Squeeze Rheometry of Magnetorheological Fluids." Advanced Materials Research 305 (July 2011): 344–47. http://dx.doi.org/10.4028/www.scientific.net/amr.305.344.

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The mechanical properties of a magnetorheological (MR) fluid in shearing, compression and shearing after compression have been studied in the magnetic field which is generated by a coil carrying different magnitudes of DC electrical current on a self-constructed test system. The relations of compression stress versus compression strain, yield stress versus compression stress were studied under different magnetic fields. The compressing tests showed that the MR fluid is very stiff at small compressive strains lower than 0.13. The shear yield stress of MR fluids after compression was much strong

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Jang, Hyo Seon, Qi Lu, and Hyoung Jin Choi. "Enhanced Magnetorheological Performance of Carbonyl Iron Suspension Added With Barium Ferrite Nanoparticle." Frontiers in Materials 8 (April 20, 2021). http://dx.doi.org/10.3389/fmats.2021.667685.

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Hard-magnetic barium ferrite (BF) nanoparticles with a hexagonal plate-like structure were used as an additive to a carbonyl iron (CI) microparticle-based magnetorheological (MR) fluid. The morphology of the pristine CI and CI/BF mixture particles was examined by scanning electron microscopy. The saturation magnetization and coercivity values of each particle were measured in the powder state by vibrating sample magnetometry. The MR characteristics of the CI/BF MR fluid measured using a rotation rheometer under a range of magnetic field strengths were compared with those of the CI-based MR flu

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Babagoli, Rezvan, Farhang Jalali, and Mohammad Khabooshani. "Performance properties of WMA modified binders and asphalt mixtures containing PPA/SBR polymer blends." Journal of Thermoplastic Composite Materials, March 30, 2021, 089270572110064. http://dx.doi.org/10.1177/08927057211006460.

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The performance properties of asphalt binders and mixtures can be enhanced utilizing several modifiers, including; Poly Phosphoric Acid (PPA), Warm Mix Asphalt (WMA) modifiers, and Styrene–Butadiene Rubber (SBR). The current study evaluated the effect of PPA and WMA contents on rheological behavior of SBR modified binders and SMA mixtures. The modified binders were subjected to rotational viscosity, Dynamic Shear Rheometer, and Bending Beam Rheometer, Multiple Stress Creep Recovery (MSCR), and Linear Amplitude Sweep (LAS) tests. The SBR/PPA and SBR/PPA/WMA modified mixtures were subjected to I

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Xu, Zhao-Dong, and Chun-Li Sun. "Single-double chains micromechanical model and experimental verification of MR fluids with MWCNTs/GO composites coated ferromagnetic particles." Journal of Intelligent Material Systems and Structures, January 24, 2021, 1045389X2098877. http://dx.doi.org/10.1177/1045389x20988779.

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Magnetorheological (MR) fluid is a typical intelligent material which is widely adopted in the mitigation of civil engineering structures, and it is normally composed of nano-sized or micro-sized iron particles, carrier fluids and additives. Because of the complexity of its composition, it is one of the research hotspot to propose a micromechanical model which can effectively describe the micromorphological transformation as well as characteristics of MR fluids. In this study, a single-double chains micromechanical model of MR fluids is proposed by taking into consideration of the influence of

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Kavlicoglu, Barkan, Faramarz Gordaninejad, and Xiaojie Wang. "A Unified Approach for Flow Analysis of Magnetorheological Fluids." Journal of Applied Mechanics 78, no. 4 (2011). http://dx.doi.org/10.1115/1.4003346.

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This study presents a new approach for flow analysis of magnetorheological (MR) fluids through channels with various surface topologies. Based on an experimental study an analytical method is developed to predict the pressure loss of a MR fluid as a function of the applied magnetic field strength, volumetric flow rate, and surface topology, without utilizing the concept of shear yield stress. A channel flow rheometer with interchangeable channel walls is built to demonstrate that the pressure loss across the MR fluid flow channel is significantly affected by the channel surface properties. Bas

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Zhang, Bo, Yongan Cao, Jiaxin Qie, et al. "Study on the dynamic mechanical properties of magnetorheological elastomer (MRE) with Fe@C." Journal of Intelligent Material Systems and Structures, August 16, 2021, 1045389X2110387. http://dx.doi.org/10.1177/1045389x211038709.

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Magnetorheological elastomer (MRE) is a promising type of smart material, suitable for shock absorbers in tank engine mount systems. In order to improve the performance of the shock absorber, we improve the magnetorheological (MR) effect of the MREs and reduce its loss factor by enhancing the interaction force between the particles and the substrate. In this work, a novel carbon-coated iron material was prepared by heat treatment, and then carbon-coated iron (Fe@C) of different proportions was added to natural rubber to prepare MRE samples. The tensile strength and elongation at break of the M

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