Magnetic field dependent steady-state shear response of Fe3O4 micro-octahedron based magnetorheological fluids

2018 ◽  
Vol 20 (30) ◽  
pp. 20247-20256 ◽  
Author(s):  
A. V. Anupama ◽  
V. B. Khopkar ◽  
V. Kumaran ◽  
B. Sahoo
Keyword(s):  
Magnetic Field ◽  
Steady State ◽  
Yield Stress ◽  
Applied Magnetic Field ◽  
Rheological Behaviour ◽  
Magnetorheological Fluids ◽  
Shear Response ◽  
Field Dependent ◽  
Dynamic Yield ◽  
Magneto Rheological

The magneto-rheological behaviour of fluids containing soft-ferrimagnetic Fe3O4 micro-octahedrons (M = magnetization, τY = dynamic yield-stress and H = applied-magnetic-field).

Magnetorheological fluids containing rod-shaped lithium–zinc ferrite particles: the steady-state shear response

Soft Matter ◽  
2018 ◽  
Vol 14 (26) ◽  
pp. 5407-5419 ◽  
Author(s):  
A. V. Anupama ◽  
V. Kumaran ◽  
B. Sahoo
Keyword(s):  
Magnetic Field ◽  
Steady State ◽  
Yield Stress ◽  
Applied Magnetic Field ◽  
Mechanical Behaviour ◽  
Zinc Ferrite ◽  
Magnetorheological Fluids ◽  
Dynamic Yield Stress ◽  
Shear Response ◽  
Dynamic Yield

The magneto-mechanical behaviour of magnetorheological-fluids containing rod-shaped soft-ferrimagnetic Li0.4Zn0.2Fe2.4O4 particles (M = magnetization, τY = dynamic yield-stress and H = applied-magnetic-field).

MAGNETORHEOLOGICAL FLUIDS AND THEIR PROPERTIES

2005 ◽  
Vol 19 (01n03) ◽  
pp. 593-596 ◽  
Author(s):  
J. M. HE ◽  
J. HUANG
Keyword(s):  
Magnetic Field ◽  
Yield Strength ◽  
Rheological Properties ◽  
Yield Stress ◽  
Applied Magnetic Field ◽  
Magnetorheological Fluids ◽  
Mr Fluid ◽  
Variable Yield ◽  
Mr Fluids

Magnetorheological (MR) fluids are materials that respond to an applied magnetic field with a change in their rheological properties. Upon application of a magnetic field, MR fluids have a variable yield strength. Altering the strength of the applied magnetic field will control the yield stress of these fluids. In this paper, the method for measuring the yield stress of MR fluids is proposed. The curves between the yield stress of the MR fluid and the applied magnetic field are obtained from the experiment. The result indicates that with the increase of the applied magnetic field the yield stress of the MR fluids goes up rapidly.

Study on the Model of Magnetic Flocculation of Magneto-Rheological Fluid

2011 ◽  
Vol 335-336 ◽  
pp. 994-999
Author(s):  
Si Hai Zhao ◽  
Tie Nan Luo
Keyword(s):  
Magnetic Field ◽  
Yield Stress ◽  
Applied Magnetic Field ◽  
Volume Concentration ◽  
Colloidal Suspension ◽  
Magneto Rheological

Magneto-rheological fluid (MRF) is non-colloidal suspension. In this paper, it is introduced that MRF will produce magnetic coagulation at an applied magnetic field by analyzing the interact energy between particles in MRF, and the coagulation is chain-like flocculation. The main reason that MRF produced magnetic coagulation is the direction between chain-like structure and magnetic field is the same. According to the studies above, the formula of yield stress for MRF at an applied magnetic field can be deduced. It can be seen from the formula that there is a square relationship between yield stress of MRF and particle magnetization, and the yield stress of MRF is closely related with volume concentration. The conclusions above match the results of existing experiments very well.

Properties and Applications of Magnetorheological Fluids

1999 ◽  
Vol 604 ◽  
Author(s):  
M.R. Jolly
Keyword(s):  
Magnetic Field ◽  
Yield Stress ◽  
Applied Magnetic Field ◽  
Rheological Behavior ◽  
Applied Field ◽  
Mechanical Systems ◽  
Magnetorheological Fluids ◽  
Rapid Response ◽  
Basic Composition ◽  
Mr Fluids

AbstractMagnetorheological (MR) fluids are materials that respond to an applied magnetic field with a change in rheological behavior. Typically, this change is manifested by the development of a yield stress that monotonically increases with applied field. Interest in MR fluids derives from their ability to provide simple, quiet and rapid response interfaces between electronic controls and mechanical systems. In this paper, the basic composition and properties of example MR fluids are reviewed. Some contemporary applications of MR fluids are then discussed.

New Driving Unit for the Direct Measurement of Yield Stress with a Stress Controlled Rheometer

2008 ◽  
Vol 18 (5) ◽  
pp. 54974-1-54974-7
Author(s):  
Hamid Shahnazian ◽  
Stefan Odenbach
Keyword(s):  
Magnetic Field ◽  
Shear Rate ◽  
Yield Stress ◽  
Field Dependence ◽  
Applied Magnetic Field ◽  
Direct Measurements ◽  
Field Dependent ◽  
Viscoelastic Effects ◽  
Magnetoviscous Effect ◽  
Rate Controlled

Abstract Investigations of rheological properties of ferrofluids have shown strong changes of the viscosity in magnetic fluids with an applied magnetic field. The change of the viscosity – the magnetoviscous effect – can theoretically be described with chain and structure formation under the influence of a magnetic field. Moreover, the formation of these structures leads to the appearance of viscoelastic effects or other non-Newtonian features like yield stress in ferrofluids with an applied magnetic field. With a shear rate controlled rheometer – as it as been used in former experiments – the yield stress could not be investigated directly. Therefore the results concerning a field dependent yield stress based on an extrapolation of shear controlled measurements. For the direct investigations of the yield stress, a dedicated stress controlled rheometer is required, allowing direct investigations of the magnitude and field dependence of this effect. In this work the design of the stress controlled rheometer with its main parameters has been described in detail. The rheological investigations with differently composed fluids show that the stress controlled rheometer enables direct measurements of even small yield stresses in ferrofluids as well as large effects like they are found in magnetorheological fluids (MRF).

Steady-State Energy Transfer of a Semi-Active Suspension Under Hybrid Control

2004 ◽  
Author(s):  
Christopher M. Boggs ◽  
Fernando D. Goncalves ◽  
Mehdi Ahmadian
Keyword(s):  
Steady State ◽  
Energy Dissipation ◽  
Yield Stress ◽  
Hybrid Control ◽  
Mr Damper ◽  
Control Policy ◽  
Mr Fluid ◽  
Mr Dampers ◽  
Field Dependent ◽  
System Energy

Magnetorheological (MR) fluids are often characterized by their field-dependent yield stress. Upon the activation of a magnetic field, the fluid has the ability to change from a fluid state to a semi-solid state in milliseconds. The field-dependent yield stress and the fluid’s fast response time make MR fluid an attractive technology for many applications. One such application that has gained considerable attention is in MR fluid dampers. The real-time control possibilities make MR dampers attractive alternatives to conventional viscous dampers. In comparing passive dampers with MR dampers, an equivalent viscous damping coefficient is often found from the energy dissipated by the MR damper with a fixed current applied to the damper. In contrast, this study investigates energy dissipation of the MR damper under a semi-active hybrid control policy. Hybrid control is a linear combination of skyhook and groundhook control. This study investigates the system energy under steady-state conditions at three frequencies, and how the system energy varies with varying contributions from skyhook and groundhook. A quarter-car rig was used to evaluate the dynamics of the hybrid suspension using an MR damper. Previous studies have shown that hybrid control can offer advantages to both the sprung and unsprung masses; however the relationship between energy dissipation and performance is not clear. In this study, we compare control policy performance to several energy-based measures. Results indicate that there is a strong correlation between sprung mass RMS acceleration and unsprung mass RMS acceleration to several of the energy-based measures.

A new platform for the prediction of field-dependent yield stress and plastic viscosity of magnetorheological fluids using particle swarm optimization

2019 ◽  
Vol 76 ◽  
pp. 615-628 ◽  
Author(s):  
Irfan Bahiuddin ◽  
Saiful Amri Mazlan ◽  
Mohd. Ibrahim Shapiai ◽  
Fitrian Imaduddin ◽  
Ubaidillah ◽  
...  
Keyword(s):  
Particle Swarm Optimization ◽  
Yield Stress ◽  
Particle Swarm ◽  
Magnetorheological Fluids ◽  
Plastic Viscosity ◽  
Swarm Optimization ◽  
Field Dependent

Influence of Fructose and Sucrose on Small and Large Deformation Rheological Behaviour of Heated Amioca Starch Dispersions

2004 ◽  
Vol 10 (1) ◽  
pp. 51-57 ◽  
Author(s):  
D. B. Genovese ◽  
V. M. Acquarone ◽  
K. -S. Youn ◽  
M. A. Rao
Keyword(s):  
Yield Stress ◽  
Large Deformation ◽  
Heating Temperature ◽  
Ageing Time ◽  
Rheological Behaviour ◽  
Angular Frequency ◽  
Rheological Parameters ◽  
Static Yield ◽  
Pasting Temperature ◽  
Dynamic Yield

Effect of sucrose or fructose on the rheological behaviour of gelatinized 5% w/w amioca starch dispersions (GSDs), was studied by small and large deformation rheological techniques. Storage (G0) and loss (G00) moduli as a function of angular frequency (o), and shear stress (s) as a function of shear rate (_) data were obtained on GSDs with: 0, 30 and 60% w/w sugars. Magnitudes of Herschel–Bulkley yield stress (0-HB) were determined from – _ data. Using the vane method, the static yield stress (0s), the dynamic yield stress (0d) and the shear modulus (G) were determined. Effect of pasting temperature and ageing time were also studied by the vane method. Addition of sugars produced an increase in all rheological parameters except 0d, suggesting that sugars increased the strength of the internal bonds or cohesiveness of the GSDs; in general, fructose was slightly more effective than sucrose. Equivalent parameters: G0 and G, and 0-HB and 0s showed good agreement. Decreasing the heating temperature increased G. GSDs with fructose showed a clear increase in 0s and G with ageing time.

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