Magnetic-field-dependent shear modulus of a magnetorheological elastomer based on natural rubber

This study aims to present a field dependent phenomenological model to characterize the Magneto-Rheological (MR) fluid in the pre-yield region under varying frequency and applied magnetic field. Systematic analytical and experimental studies are proposed to formulate a hybrid model for representing complex shear modulus of a typical MR fluid (MR 122EG from Lord Corporation) as a function of both applied magnetic field and frequency. Two fully treated MR based sandwich beams with aluminum and copper face layers and MR fluid as the core layer are designed and fabricated. Uniform magnetic flux across the sandwich beam is provided using two permanent magnets. The fabricated MR based sandwich beams are then tested on an electrodynamic shaker under sweep sine excitation and different applied magnetic field to realize the effect of external excitation frequency and applied magnetic field on the stiffness and damping properties of the structure. The finite element model based on classical plate theory is also developed to analyze vibration response of the designed MR based sandwich beams incorporated with MR fluid. Then, by correlating the finite element results with those of the experiment, the frequency and field dependent complex shear modulus of the MR fluid is identified.

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Influence of the Particle Size on the Rheology of Magnetorheological Elastomer

Materials Science Forum ◽

10.4028/www.scientific.net/msf.809-810.757 ◽

2014 ◽

Vol 809-810 ◽

pp. 757-763 ◽

Cited By ~ 7

Author(s):

Qian Jin ◽

Yong Gang Xu ◽

Yang Di ◽

Hao Fan

Keyword(s):

Magnetic Field ◽

Particle Size ◽

Theoretical Analysis ◽

Shear Modulus ◽

Rheological Properties ◽

Optimum Size ◽

Magnetorheological Elastomer ◽

Magnetorheological Effect ◽

The Relationship ◽

The Magnetic Field

In this paper, the correlation between the particle size and rheological properties of MRE was discussed through both experimental results and theoretical analysis. It shows that the particle size can significantly influence the magnetorheological effect by changing the initial shear modulus and the saturated magnetic-induced shear modulus . With an increase in the particle size, the initial shear modulus gets lower, and the saturated magnetic-induced shear modulus increases to the maximum and then decreases. The larger the particle size is, the longer the distance between neighbor particles along the magnetic field is. Based on the relationship between the particle size and shear modulus, there exists an optimum size for added particles. Moreover, the performance of MRE can be improved by optimizing the particle size based on those rules.

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Investigation on variable shear modulus of magnetorheological elastomer based on natural rubber due to change of fabrication design

Polymer Engineering & Science ◽

10.1002/pen.23349 ◽

2012 ◽

Vol 53 (5) ◽

pp. 992-1000 ◽

Cited By ~ 13

Author(s):

Ji-Hyun Yoon ◽

In-Hyung Yang ◽

Un-Chang Jeong ◽

Kyung-Ho Chung ◽

Jung-Youn Lee ◽

...

Keyword(s):

Shear Modulus ◽

Natural Rubber ◽

Magnetorheological Elastomer ◽

Variable Shear

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A study of the magnetic fatigue properties of a magnetorheological elastomer

Journal of Intelligent Material Systems and Structures ◽

10.1177/1045389x18799495 ◽

2018 ◽

Vol 30 (5) ◽

pp. 749-754 ◽

Cited By ~ 3

Author(s):

Chenglong Lian ◽

Kwang-Hee Lee ◽

Seung-Bok Choi ◽

Chul-Hee Lee

Keyword(s):

Magnetic Field ◽

Mechanical Properties ◽

Shear Modulus ◽

Internal Structure ◽

Fatigue Properties ◽

Fatigue Cycle ◽

Repeated Application ◽

Magnetorheological Elastomer ◽

Before And After ◽

Microscopy Images

In this study, the magnetic fatigue properties of a magnetorheological elastomer were evaluated with and without a magnetic field. To accomplish the process, a magnetic fatigue tester and magnetorheological elastomer samples were designed and fabricated. The mechanical properties of the magnetorheological elastomer were determined under various fatigue cycle numbers and fatigue frequencies with and without a magnetic field. The shear modulus of the magnetorheological elastomer was also measured before and after the test to evaluate its mechanical properties. The results show that the shear modulus of the magnetorheological elastomer was larger in the presence of a magnetic field and decreased as the number of fatigue cycles increased because the internal structure became loose. Scanning electron microscopy images showed that the internal structure of the magnetorheological elastomer was loose under repeated application of magnetic fields.

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