Nonlinear viscoelastic model of isotropic and anisotropic magnetorheological elastomers

Sapouna, K., Xiong, Y.P. and Shenoi, R.A. (2012) Nonlinear viscoelastic model of isotropic and anisotropic magnetorheological elastomers. 4th International Conference “Smart Materials, Structures and Systems" (CIMTEC2012), Montecatini-Terme, Italy. 09 - 13 Jun 2012.

Abstract

Magnetorheological Elastomers (MREs) is a promising smart material that can adjust its mechanical and dynamic properties instantly and irreversibly when an external magnetic field is applied. Our recent research showed that MREs is governed by a nonlinear stress strain relationship where both stiffness and damping depend nonlinearly on the magnetic field. However, the majority of the researches on MREs relevant publications are limited to linear domain assuming the material behaves linearly in a specific strain range. This paper focuses on the characterization and development of a nonlinear general viscoelastic model that can predict the variation of damping and stiffens with the magnetic field for both types of MRE (anisotropic and isotropic). For this purpose static and dynamic compression tests are performed first for a range of strain amplitudes and magnetic fields. Then a parameter extraction method is developed. An application of the developed MRE model is demonstrated by simulating an active vibration isolator and its isolation effectiveness is predicted numerically using Matlab and Simulink. MRE isolators can be an attractive solution to the complicated active mechanical isolation systems present in many engineering applications in the industry today.

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Contributors

Author: Y.P. Xiong

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