Dynamic Mechanical Properties of Magnetorheological Elastomers: Experiment and Modelling

2019 International Conference on Smart Materials Applications

Zhu, G.H.^1 ; Z.G., Li ; Y.P., Xiong ; L., Xiao ; M., Li

Department of Mechanics, Xi'an University of Science and Technology, Xi'an, China^1

Faculty of Engineering and the Environment, University of Southampton, Southampton, United Kingdom^2

关键词: Dynamic behaviours;    Dynamic mechanical property;    Elastomer matrices;    External magnetic field;    Fractional derivative model;    Magnetic-field intensity;    Magnetorheological elastomers;    Viscoelastic properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/559/1/012001/pdf
DOI  :  10.1088/1757-899X/559/1/012001

来源: IOP

【 摘 要 】

As a kind of smart material, magnetorheological elastomer (MRE) is composed of magnetizable particles dispersed in an elastomer matrix. Because adjusting an external magnetic field can continuously, rapidly and reversibly control the dynamic properties, there has been increasing research on MRE for mitigation of unwanted vibrations. In this paper, the dynamic mechanical analysis tests were performed to investigate the influence of strain, frequency and magnetic field on the controllable dynamic properties. The storage modulus and loss modulus of MRE were analyzed with frequencies from 1 to 50 Hz, strain amplitudes from 1 to 6% and magnetic field intensities from 0 to 500 mT. The results show that the storage modulus decreases with increasing strain amplitude, increases with frequency and magnetic strength, and remains constant when the magnetic saturation occurs. Furthermore, the dependence of loss modulus on frequency lies on the matrix material of MRE. Based on the experimental results, a fractional derivative model was developed to describe the viscoelastic properties and the controllable dynamic properties. The comprehensive study of mechanical property characterisation is a guarantee for constitutive models to accurately describe the dynamic behaviour of MRE, which is an essential step towards the application for vibration control.