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Author: Stephen Douglas Ray
Publisher:
ISBN:
Category :
Languages : en
Pages : 40
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Book Description
An experimental apparatus has been developed that characterizes magneto-rheological (MR) fluid for an MIT Mechanical Engineering laboratory class by charting the fluid's yield stress versus magnetic field strength. The apparatus consists of a cantilevered beam that is damped using MR fluid, through which a magnetic field is varied. Unique functional requirements for a class experiment as well as experimental design rationale are also discussed. Lord's MRF-336AG MR fluid is characterized at low magnetic field strengths and compared to the company provided data. Experimental data suggest the magnetic field strength affects the fluid yield stress more greatly than the company data, though both data show similar general trends. This discrepancy likely comes from approximations for damper velocity made in the analysis. Both a Bingham plastic and Newtonian model are used to describe the fluid and based on the similarity of the results from both models at low field strengths, it is concluded that MR fluid can be modeled as a Newtonian fluid for field strengths between 0 and 4 kAmp/m.
Author: Stephen Douglas Ray
Publisher:
ISBN:
Category :
Languages : en
Pages : 40
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Book Description
An experimental apparatus has been developed that characterizes magneto-rheological (MR) fluid for an MIT Mechanical Engineering laboratory class by charting the fluid's yield stress versus magnetic field strength. The apparatus consists of a cantilevered beam that is damped using MR fluid, through which a magnetic field is varied. Unique functional requirements for a class experiment as well as experimental design rationale are also discussed. Lord's MRF-336AG MR fluid is characterized at low magnetic field strengths and compared to the company provided data. Experimental data suggest the magnetic field strength affects the fluid yield stress more greatly than the company data, though both data show similar general trends. This discrepancy likely comes from approximations for damper velocity made in the analysis. Both a Bingham plastic and Newtonian model are used to describe the fluid and based on the similarity of the results from both models at low field strengths, it is concluded that MR fluid can be modeled as a Newtonian fluid for field strengths between 0 and 4 kAmp/m.
Author: Shaju John
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Bhau Kumbhar
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659775734
Category :
Languages : en
Pages : 100
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Book Description
Magneto-rheological (MR) fluid technology has been proven for many industrial applications like shock absorbers, actuators, etc. In this research, electrolytic and carbonyl iron powder based MR fluids have been synthesized and characterized to identify their different properties especially to suit high yield stress applications like MR brake, MR clutch etc. Few MR fluid samples based on sunflower oil, which is bio-degradable, environmentally friendly and abundantly available have also been prepared. Different synthesis and characterization techniques have been presented to help the researchers to work further in this area. characterization results of locally made MR fluid samples and commercially available Lord Corporation's 132DG MR fluid have been compared and then suitability of particular MR fluid for high yield stress application has decided.
Author: Norman Wereley
Publisher: Royal Society of Chemistry
ISBN: 1849736677
Category : Science
Languages : en
Pages : 410
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Book Description
Leading experts provide a timely overview of the key developments in the physics, chemistry and uses of magnetorheological fluids.
Author: Cecilio Angulo
Publisher: IOS Press
ISBN: 1586037986
Category : Computers
Languages : en
Pages : 452
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Book Description
Contains papers which were presented at the 10th anniversary of the International Conference of the ACIA (CCIA'07) in Sant Julia de Loria (Andorra), October 25-26th, 2007. This book is intended for those computer scientists or engineers who are interested in artificial intelligence."
Author: Seung-Bok Choi
Publisher: Materials, Circuits and Device
ISBN: 1785617702
Category : Technology & Engineering
Languages : en
Pages : 443
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Book Description
This book introduces magnetorheological fluids and elastomers, and explores their material properties, related modelling techniques and applications in turn. The book offers insights into the relationships between the properties and characterisation of MR materials and their current and future applications.
Author: Carter Ralph
Publisher: Springer
ISBN: 3319217623
Category : Technology & Engineering
Languages : en
Pages : 457
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Book Description
Experimental Mechanics of Composite, Hybrid, and Multifunctional Materials, Volume 7 of the Proceedings of the 2015SEM Annual Conference& Exposition on Experimental and Applied Mechanics, the seventh volume of nine from the Conference, brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on a wide range of areas, including: Multifunctional Materials Hybrid Materials Novel Composites Nano- and Particle-Reinforced Composites Additive Manufacturing of Composites Digital Imaging of Composites Damage Detection Non-Destructive Evaluation Fatigue and Fracture of Composites Manufacturing and Joining of Composites Advanced Composites Applications
Author: Kunquan Lu
Publisher: World Scientific
ISBN: 9814481181
Category : Technology & Engineering
Languages : en
Pages : 1013
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Book Description
This volume covers the most recent progress of research work on electrorheological (ER) and magnetorheological (MR) industrial applications related to controllable damping, ER/MR fundamental mechanisms, and understanding the potential of new classes of field responsive materials.The proceedings have been selected for coverage in:• Materials Science Citation Index®• Index to Scientific & Technical Proceedings® (ISTP® / ISI Proceedings)• Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)• CC Proceedings — Engineering & Physical Sciences
Author: Ashkan Dargahi
Publisher:
ISBN:
Category :
Languages : en
Pages : 126
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Book Description
Magnetorheological elastomers (MREs) are a novel class of magneto-active materials comprised of an elastomeric matrix impregnated by micron-sized ferromagnetic particles, which exhibit adjustable mechanical properties such as stiffness and damping coefficient in a reversible manner under the application of an external magnetic field. MREs are solid state of magnetorheological (MR) materials. In contrast to MR fluids, which provide field-dependent apparent viscosity, MREs, being a smart viscoelastic material, are capable of providing controlled field dependent moduli. Yet having a solid grasp of highly complex behavior of this active composite is a fundamental necessity to design any adaptive structure based on the MRE. This study is concerned with investigation of the static and dynamic behavior of the magnetorheological elastomers. To this end, six different types of MREs with varying contents of the rubber matrix as well as ferromagnetic particles are fabricated and characterized statically in the shear mode as a function of the magnetic field intensity. The MRE containing the highest percentage of iron particles (40% volume fraction) exhibited a notable relative MR effect of 555% with 181.54 KPa increase in the MRE shear modulus. This particular MRE was then chosen for subsequent dynamic characterization. The dynamic responses of magnetorheological elastomers revealed strong dependence on the strain and strain rate as well as the applied magnetic field intensity. Dynamic characterization is performed in shear mode under harmonic excitations under the broad ranges of shear strain amplitude (2.5-20%), frequency (0.1-50 Hz) and magnetic field intensity (0-450 mT). The strain softening, strain stiffening, strain rate stiffening and the magnetic field stiffening phenomena are identified as the nonlinear properties of MRE stress-strain hysteresis loops. Subsequently, an operator-based Prandtl-Ishlinskii (PI) phenomenological model is developed to predict the nonlinear hysteresis behavior of the MREs as functions of strain, strain rate and field intensity. The stop-operator-based classical PI model using only 10 hysteresis operators provided very accurate predictions, and it involved identification of only four parameters, which were dependent on the loading conditions. The validity of the developed Classical Prandtl-Ishlinskii model is assessed using the laboratory-measured data for MRE over a wide range of inputs. The proposed model is further generalized to predict the dynamic behavior of MRE independent of the loading conditions, which could be beneficial for controlling the MRE-based adaptive devices in real time. The results demonstrated that the proposed generalized model could accurately characterize the nonlinear hysteresis properties of MRE under a wide range of loading conditions and applied magnetic fields.
Author:
Publisher:
ISBN:
Category : Fluid mechanics
Languages : en
Pages : 380
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Book Description
