Viscoelastic Responses of Silicone-Rubber-Based Magnetorheological Elastomers Under Compressive and Shear Loadings

2013 ◽  
Vol 135 (2) ◽  
Author(s):  
Rui Li ◽  
L. Z. Sun
Keyword(s):  
Magnetic Field ◽  
Silicone Rubber ◽  
Viscoelastic Properties ◽  
Mechanical Performance ◽  
Dynamic Stiffness ◽  
Zero Magnetic Field ◽  
Dynamic Strain ◽  
Loading Frequency ◽  
Magnetorheological Elastomers ◽  
Mr Effect

Magnetorheological elastomers (MREs) are adaptive composite materials in the sense that their mechanical properties are tailored by the applied magnetic field. In this paper we developed both isotropic and anisotropic silicone-rubber-based MREs. We examined the zero-magnetic-field dynamic stiffness and damping along with the magnetic field induced changes (the magnetorheological (MR) effect) for the viscoelastic properties of the MREs by conducting both compression and shear investigations. While the anisotropic MREs exhibited substantial magnetic-field-dependent viscoelastic properties at a medium magnetic field, the isotropic ones showed a negligible MR effect. The magnetic filler structure and concentration, loading frequency, and dynamic strain amplitude were all confirmed to play significant roles in the dynamic mechanical performance of the MREs.

STUDY OF UTILIZABLE MAGNETORHEOLOGICAL ELASTOMERS

2007 ◽  
Vol 21 (28n29) ◽  
pp. 4875-4882 ◽  
Author(s):  
X. L. GONG ◽  
L. CHEN ◽  
J. F. LI
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Carbonyl Iron ◽  
Zero Magnetic Field ◽  
Iron Particles ◽  
Magnetorheological Elastomers ◽  
Vibration Absorption ◽  
Tuned Vibration Absorbers ◽  
Roll Mill ◽  
Mr Effect

This paper presents two kinds of magnetorheological elastomers (MREs). One is composed of appropriate silicon rubber, carbonyl iron particles and some other materials. It is cured under a strong magnetic field at a room temperature. Its shear modulus change from 0.34MPa at zero magnetic field to 3.34MPa at 1T magnetic field, the relative MR effect reaches 878%. Such high MR effect has not been reported until now. The other is composed by appropriate natural rubber, carbonyl iron particles and some other materials. After the compositions are mixed in a two-roll mill, they are cured under a strong magnetic field according to a temperature profile. The increment of its modulus reaches 3.6MPa, and the relative modulus increment is 133%. Their mechanical properties are also evaluated. All observed results show that the fabricated MREs are utilizable. They have successfully been utilized to adaptive tuned vibration absorbers, which will serve for vibration absorption of vehicles.

scholarly journals Magnetorheological Hybrid Elastomers Based on Silicone Rubber and Magnetorheological Suspensions with Graphene Nanoparticles: Effects of the Magnetic Field on the Relative Dielectric Permittivity and Electric Conductivity

2019 ◽  
Vol 20 (17) ◽  
pp. 4201 ◽  
Author(s):  
Bica ◽  
Bunoiu
Keyword(s):  
Magnetic Field ◽  
Dielectric Permittivity ◽  
Silicone Rubber ◽  
Silicone Oil ◽  
Relative Dielectric Permittivity ◽  
Magnetorheological Elastomers ◽  
Magnetorheological Suspensions ◽  
Alternating Electric Field ◽  
Graphene Nanoparticles ◽  
The Magnetic Field

Hybrid magnetorheological elastomers (hMREs) were manufactured based on silicone rubber, silicone oil, carbonyl iron microparticles, graphene nanoparticles and cotton fabric. Using the hMREs, flat capacitors (FCs) were made. Using the installation described in this paper, the electrical capacitance and the coefficient of dielectric losses of the hMREs were measured as a function of the intensity of the magnetic field superimposed over an alternating electric field. From the data obtained, the electrical conductivity, the relative dielectric permittivity and magnetodielectric effects are determined. It is observed that the obtained quantities are significantly influenced by the intensity of the magnetic field and the amount of graphene used.

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.

MONITORING INTERPARTICLE DISTANCE IN MAGNETORHEOLOGICAL COMPOSITES

2007 ◽  
Vol 21 (28n29) ◽  
pp. 4868-4874
Author(s):  
G. BOSSIS ◽  
E. COQUELLE ◽  
C. NOEL ◽  
F. GIULIERI ◽  
A. M. CHAZE
Keyword(s):  
Magnetic Field ◽  
Liquid Crystal ◽  
Energy Dissipation ◽  
Viscoelastic Properties ◽  
Magnetic Particles ◽  
Interparticle Distance ◽  
Magnetorheological Elastomer ◽  
Magnetorheological Elastomers ◽  
Magnetic Spheres ◽  
The Creation

We describe two different systems, the first one based on a magnetorheological elastomer and the second one on magnetic particles inside a liquid crystal. In both system we manage to have chain structures with particles that are not in contact. The effect of the gap between particles on the viscoelastic properties are studied. We show in particular how in magnetorheological elastomers, the energy dissipation is closely related to the creation and the motion of cavities in the gap between the particles. In liquid crystal chaining of particles can occur without applying a magnetic field. This happens if the anchoring of liquid crystal on the surface of the particles is homeotropic. We demonstrate how the combination of elastic defects and of a magnetic field allow to obtain microscopic springs made of a pair of magnetic spheres.

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.

Studies on Magnetorheological Elastomers for Isolators

2013 ◽  
Vol 750-752 ◽  
pp. 1168-1171
Author(s):  
Xue Yang ◽  
Chang Geng Shuai ◽  
Shen Lin Yang
Keyword(s):  
Mechanical Performance ◽  
Magnetorheological Elastomers ◽  
Performance Requirements ◽  
New Type ◽  
Mr Effect

Magnetorheological (MR) elastomers are a new type of MR material. At present, most studies in this field are at laboratory stage, and practicability was rarely considered preparation of MR elastomer materials. Consequently, the existing materials with low overall properties cannot be applied in engineering. In this paper, the performance requirements for MR elastomers to be used in isolators were proposed. Then a type of practical MR elastomers for isolators was prepared, and its mechanical performance and MR effect were tested. The results show that the designed MR elastomers have high mechanical performance and high MR effect, and thus can be used in isolators.

MAGNETORHEOLOGICAL ELASTOMERS BASED ON POLYURETHANE/SI-RUBBER HYBRID

2005 ◽  
Vol 19 (07n09) ◽  
pp. 1114-1120 ◽  
Author(s):  
Y. Hu ◽  
Y. L. Wang ◽  
X. Q. Gong ◽  
X. L. Gong ◽  
X. Z. Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Preparation Condition ◽  
Sem Analysis ◽  
Maximum Increase ◽  
Magnetorheological Elastomers ◽  
Testing Conditions ◽  
Preparation Conditions ◽  
The Matrix ◽  
Mr Effect ◽  
The Relationship

A kind of magnetorheological elastomers based on polyurethane (PU)/silicone rubber ( Si -rubber) hybrid is fabricated without applying magnetic fields. The MR effect is improved by optimizing preparation conditions, in particular by adjusting PU/Si -rubber ratio, and improving compatibility between PU and Si -rubber. The influences of the preparation condition and the relationship between the microstructure and MR effect of this kind of magnetorheological elastomers are discussed in detail. The results show that this kind of MR elastomers has better MR effect than that of MR elastomers based on pure Si -rubber or PU matrix with same testing conditions. SEM analysis indicates that the former forms a peculiar interpenetrating microstructure in the presence of PU in the matrix. The maximum increase in shear modulus of this kind of MR elastomers can be up to 0.5MPa when exposed to a magnetic field of about 0.2T.

scholarly journals Magnetorheological Elastomers: Fabrication, Characteristics, and Applications

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4597
Author(s):  
Sung Kang ◽  
Kisuk Choi ◽  
Jae-Do Nam ◽  
Hyoung Choi
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Wave ◽  
Viscoelastic Properties ◽  
Magnetic Particles ◽  
Advanced Materials ◽  
Vibration Absorber ◽  
Solid Base ◽  
Magnetorheological Elastomers ◽  
Electromagnetic Wave Absorption ◽  
Elastomeric Materials

Magnetorheological (MR) elastomers become one of the most powerful smart and advanced materials that can be tuned reversibly, finely, and quickly in terms of their mechanical and viscoelastic properties by an input magnetic field. They are composite materials in which magnetizable particles are dispersed in solid base elastomers. Their distinctive behaviors are relying on the type and size of dispersed magnetic particles, the type of elastomer matrix, and the type of non-magnetic fillers such as plasticizer, carbon black, and crosslink agent. With these controllable characteristics, they can be applied to various applications such as vibration absorber, isolator, magnetoresistor, and electromagnetic wave absorption. This review provides a summary of the fabrication, properties, and applications of MR elastomers made of various elastomeric materials.

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