Modelling and experimental characterisation of a compressional adaptive magnetorheological elastomer isolator

2021 ◽  
pp. 107754632110253
Author(s):  
Emiliano Rustighi ◽  
Diego F Ledezma-Ramirez ◽  
Pablo E Tapia-Gonzalez ◽  
Neil Ferguson ◽  
Azrul Zakaria
Keyword(s):  
Magnetic Field ◽  
Silicone Rubber ◽  
Magnetic Interaction ◽  
Iron Particle ◽  
Material Model ◽  
Rubber Matrix ◽  
Magnetorheological Elastomer ◽  
Volume Percentage ◽  
Shock Absorbers ◽  
Percent Concentration

This article proposes a simple physical-based model to describe and predict the performance of axially compressed magnetorheological elastomer cylinders used as vibration and shock absorbers. The model describes the magnetorheological elastomer macroscopic stiffness changes because of an externally applied magnetic field from a microscopic composite cell of silicone rubber and carbonyl iron particle. Despite neglecting the material hyperelasticity, anisotropy and adjacent magnetic interaction, the model describes effectively the effect of the magnetic field on the macroscopic modulus of elasticity. The changes in the mechanical properties with the induced magnetic field are measured on samples of different particle concentration based on volume percentage, that is, 10 and 30 percent concentration of iron particles in a silicone rubber matrix. The manufacturing process of the samples is detailed, as well as the experimental validation of the effective stiffness change under a magnetic field in terms of transmissibility and mobility testing. However, the prediction seems to be limited by the linear elastic material model. Predictions and measurements are compared, showing that the model is capable of predicting the tunability of the dynamic/shock absorber and that the proposed devices have a possible application in the reduction of mechanical vibrations.

Performance of Magnetorheological Elastomer Based Silicone/SAIB

2018 ◽  
Vol 772 ◽  
pp. 61-65
Author(s):  
Muntaz Hana Ahmad Khairi ◽  
Saiful Amri Mazlan ◽  
Ubaidillah ◽  
Siti Aishah Abdul Aziz ◽  
Norhiwani Mohd Hapipi
Keyword(s):  
Rheological Properties ◽  
Silicone Rubber ◽  
Carbonyl Iron ◽  
Excitation Frequency ◽  
Rubber Matrix ◽  
Iron Particles ◽  
Magnetorheological Elastomer ◽  
Magnetorheological Elastomers ◽  
Mr Effect ◽  
Strain Dependent

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/SAIB, 64%. The fabricated MREs samples were frequency and strain dependent. The relative MR effect for both samples showed decreasing trend with the increment of strain amplitude and excitation frequency.

Shock attenuation mechanisms of magnetorheological elastomers absorbers: A theoretical analysis

2016 ◽  
Vol 51 (5) ◽  
pp. 721-730 ◽  
Author(s):  
Dingxin Leng ◽  
Xiaojie Wang ◽  
Lingyu Sun ◽  
Faramarz Gordaninejad
Keyword(s):  
Magnetic Field ◽  
Energy Dissipation ◽  
Variable Stiffness ◽  
Rubber Matrix ◽  
Interfacial Friction ◽  
Response Force ◽  
Shock Attenuation ◽  
Interfacial Bond ◽  
Magnetorheological Elastomers ◽  
Shock Absorbers

To predict the dynamic response of shock absorbers based on magnetorheological elastomers and investigate the contributions of various possible energy dissipation mechanisms, a modified four-parameter model of magnetorheological elastomers was proposed, which includes the viscoelastic characteristics of rubber matrix, the variable stiffness and damping property, and the interfacial bond conditions of magnetorheological elastomers under the applied magnetic field. The constitutive equations of magnetorheological elastomers were derived and all parameters were identified based on a published literature. It is theoretically demonstrated that the maximum response force under an impulse input could be attenuated approximately 30% when the magnetic field with 0.57 T is applied. Using the proposed theoretical model, it is shown that the energy dissipation mechanisms mainly come from the interfacial friction between particles and matrix, and the increment on stiffness and dynamic viscosity of the rubber matrix provides reverse contributions to the shock mitigation, while the interfacial bond stiffness has little influence on the response force amplitude. Hence, when magnetorheological elastomers are utilized in shock absorbers, it is suggested to take advantage of the interfacial friction energy.

Anisotropic Silicone Rubber Based Magnetorheological Elastomer with Oil Silicone and Iron Microparticles

2012 ◽  
Vol 190 ◽  
pp. 645-648 ◽  
Author(s):  
I. Bica ◽  
Maria Balasoiu ◽  
A.I. Kuklin
Keyword(s):  
Magnetic Field ◽  
Elastic Properties ◽  
Silicone Rubber ◽  
Longitudinal Magnetic Field ◽  
Dipole Approximation ◽  
Continuous Linear ◽  
Magnetorheological Elastomer ◽  
Magnetorheological Elastomers ◽  
Young Module ◽  
Linear Body

Results on anisotropic magnetorheological elastomers magnetoelasticity are presented and discussed. In the dipole approximation, and considering the MRE as a continuous linear body, the effects of magnetic field on its main elastic properties (linear deformations and Young module) are investigated. Experimental evidences that the compression of the cylindrical bar is influenced by the intensity of the longitudinal magnetic field and the Young module of the MRE sample increases with the intensity H of the longitudinal magnetic field are obtained and the results discussed.

scholarly journals Role of Magnetorheological Fluids and Elastomers in Today’s World

2017 ◽  
Vol 11 (4) ◽  
pp. 267-274 ◽  
Author(s):  
Paweł Skalski ◽  
Klaudia Kalita
Keyword(s):  
Magnetic Field ◽  
Automotive Industry ◽  
Smart Materials ◽  
Magnetorheological Fluids ◽  
Magnetorheological Elastomer ◽  
Shock Absorbers ◽  
Damping Control ◽  
Mr Fluids ◽  
High Tension

AbstractThis paper explains the role of magnetorheological fluids and elastomers in today’s world. A review of applications of magnetorheological fluids and elastomers in devices and machines is presented. Magnetorheological fluids and elastomers belong to the smart materials family. Properties of magnetorheological fluids and elastomers can be controlled by a magnetic field. Compared with magnetorheological fluids, magnetorheological elastomers overcome the problems accompanying applications of MR fluids, such as sedimentation, sealing issues and environmental contamination. Magnetorheological fluids and elastomers, due to their ability of dampening vibrations in the presence of a controlled magnetic field, have great potential present and future applications in transport. Magnetorheological fluids are used e.g. dampers, shock absorbers, clutches and brakes. Magnetorheological dampers and magnetorheological shock absorbers are applied e.g. in damping control, in the operation of buildings and bridges, as well as in damping of high-tension wires. In the automotive industry, new solutions involving magnetorheological elastomer are increasingly patented e.g. adaptive system of energy absorption, system of magnetically dissociable [hooks/detents/grips], an vibration reduction system of the car’s drive shaft. The application of magnetorheological elastomer in the aviation structure is presented as well.

scholarly journals Homopolymer Based Magnetorheological Elastomer

2021 ◽  
pp. 54-57
Author(s):  
Parth Dhrangdhariya ◽  
Sunil Padhiyar ◽  
Prince Mishra
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Vibration Control ◽  
Applied Magnetic Field ◽  
Variable Stiffness ◽  
Rubber Matrix ◽  
Vibration Absorber ◽  
Vibration Isolator ◽  
Magnetorheological Elastomer ◽  
Spring Force

Magnetorheological rubber belongs to the class of ‘Smart Material’ whose mechanical properties can be altered continuously and reversibly by an applied magnetic field. Magnetorheological rubber (MRE’s) are composites that consists of magnetically polarisable particles mixed into rubber matrix. With suitable controlled algorithms, they respond to change in their environment. Purpose of this work is to know more about magnetorheological rubber for active stiffness, vibration control and dampening applications. Although few applications of these materials have been reported in the literature, the possibilities are numerous. They can be used for various applications such as vibration absorber, vibration isolator, variable stiffness bush, spring, force sensors, actuators etc.

scholarly journals SEMI-ACTIVE DAMPING PERFORMANCE OF IRON PARTICLE FILLED SILICONE RUBBER

2016 ◽  
Vol 3 ◽  
pp. 7-10 ◽  
Author(s):  
Florian Dirisamer ◽  
Umut Cakmak ◽  
Edmund Marth ◽  
Zoltan Major
Keyword(s):  
Magnetic Field ◽  
Silicone Rubber ◽  
Field Effect ◽  
Iron Particle ◽  
Active Damping ◽  
Damping Coefficient ◽  
Silicone Elastomers ◽  
Silicone Rubbers

The aim of this work was to design, produce and evaluate a demonstrator to visualize the magneto-induced damping behaviour of materials. In contrast to standard materials, the damping coefficient of iron particle filled silicone rubbers can be controlled by a semi-active magnetic field. This field effect should be characterized in order to evaluate the suitability of these magnetorheological silicone elastomers for the use in different configurations and applications.

scholarly journals Experimental and numerical study on surface roughness of magnetorheological elastomer for controllable friction

Friction ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 917-929 ◽  
Author(s):  
Rui Li ◽  
Xi Li ◽  
Yuanyuan Li ◽  
Ping-an Yang ◽  
Jiushan Liu
Keyword(s):  
Magnetic Field ◽  
Surface Roughness ◽  
Surface Morphology ◽  
Volume Fraction ◽  
Particle Volume Fraction ◽  
Rubber Matrix ◽  
Magnetorheological Elastomer ◽  
Particle Volume ◽  
Simulation Results ◽  
The Magnetic Field

Abstract Magnetorheological elastomer (MRE) is a type of smart material of which mechanical and electrical properties can be reversibly controlled by the magnetic field. In this study, the influence of the magnetic field on the surface roughness of MRE was studied by the microscopic modeling method, and the influence of controllable characteristics of the MRE surface on its friction properties was analyzed by the macroscopic experimental method. First, on the basis of existing studies, an improved mesoscopic model based on magnetomechanical coupling analysis was proposed. The initial surface morphology of MRE was characterized by the W-M fractal function, and the change process of the surface microstructures of MRE, induced by the magnetic interaction between particles, was studied. Then, after analyzing the simulation results, it is found that with the increase in the magnetic field and decrease in the modulus of rubber matrix, the surface of MRE changes more significantly, and the best particle volume fraction is within 7.5%–9%. Furthermore, through experimental observation, it is found that the height of the convex peak on the surface of MRE decreases significantly with the action of the magnetic field, resulting in a reduction in the surface roughness. Consistent with the simulation results, a particle volume fraction of 10% corresponds to a maximum change of 14%. Finally, the macroscopic friction experiment results show that the friction coefficients of MREs with different particle volume fractions all decrease with the decrease in surface roughness under the magnetic field. When the particle volume fraction is 10%, the friction coefficient can decrease by 24.7% under a magnetic field of 400 mT, which is consistent with the trend of surface roughness changes. This shows that the change in surface morphology with the effect of the magnetic field is an important factor in the control of MRE friction properties by magnetic field.

Behavior of thick magnetorheological elastomers

2012 ◽  
Vol 23 (9) ◽  
pp. 1033-1039 ◽  
Author(s):  
Faramarz Gordaninejad ◽  
Xiaojie Wang ◽  
Praveen Mysore
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Iron Particle ◽  
Magnetorheological Elastomer ◽  
Static Compression ◽  
Magnetorheological Elastomers ◽  
Shear Moduli ◽  
Young’S Moduli ◽  
Lap Shear ◽  
Linear Behavior

In this study, the behavior of thick magnetorheological elastomers is experimentally investigated. Two types of magnetorheological elastomer specimens of varying concentrations, with circular and rectangular shapes having thicknesses from 6.35 mm to a maximum of 25.4 mm, are prepared. The magnetorheological elastomer samples are studied under quasi-static compression and double lap-shear tests. The shear and the Young’s moduli of the magnetorheological elastomers are obtained under different applied magnetic fields. It is observed that the field-induced change in the modulus is independent of the thickness of the magnetorheological elastomer and is only dependent on the iron particle concentration and the magnetic field strength. With the increase in the applied magnetic field, it is observed that the change in modulus varies from a linear behavior at lower applied magnetic fields to a nonlinear one at higher magnetic fields. It is found that compressive and shear moduli only depend on the applied magnetic fields and are independent of the sample thickness. In addition, the maximum induced change in material modulus under compression is shown to be 99%, whereas in shear it is found to be 68% when compared to its off-state.

scholarly journals On the shear test of a MR elastomer under magnetic field applied at various angles

2021 ◽  
Author(s):  
Eike Dohmen ◽  
Dmitry Yu Borin
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Silicone Rubber ◽  
Shear Test ◽  
Rubber Matrix ◽  
Shear Direction ◽  
Deformation Effect ◽  
Practical Applications ◽  
Demagnetizing Factor ◽  
Applied External Magnetic Field

Abstract In this paper the influence of the angle between the applied external magnetic field and the mechanical shear direction on the measured elasticity of a magnetorheological (MR) elastomer is addressed. The whole range of magnetic field angles from 0○ to 90○ is analyzed in steps of 5○. Though this dependence is of highest importance for practical applications this issue is rather neglected in previous studies. The work uses MR elastomer specimens based on a silicone rubber matrix containing iron powder in weight fractions of 82 wt.% and 89 wt.%. It has been shown that the measured modulus of elasticity of such composites decreases as the angle between an external magnetic field and applied shear deformation increases. As the framework for the discussion of the findings a macroscopic explanation associated with the magneto-deformation effect as well as an influence of the demagnetizing factor are considered.

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