关键词: 磁流变弹性体, 力学性能, Bouc-Wen模型, 参数拟合, 拟合误差, 复合材料

Abstract: In this paper, the dynamic mechanical properties of the developed composite rubber-based magnetorheological elastomer materials were studied, and their mechanical properties were tested by cyclic shear test. Three groups of shear experiments were designed. The effects of strain amplitude, loading frequency and external magnetic field on the mechanical properties of MRE were studied respectively. The hysteresis curves of MRE under different loading conditions were drawn. According to the experimental data, the maximum damping force, equivalent stiffness, storage modulus, dissipation energy, loss modulus and loss factor were calculated. The experimental results show that the energy dissipation capacity of MRE is significantly affected by amplitude and frequency. Within 200% amplitude and 2.0 Hz loading frequency, its energy dissipation capacity is positively correlated with amplitude and frequency range, and its energy dissipation capacity is more affected by amplitude than by frequency. The external magnetic field can also improve the energy dissipation capacity of MRE, but at the magnetic field intensity above 50 mT, the improvement trend of this MRE performance is significantly weakened. Finally, the Bouc-Wen model is used to describe the dynamic mechanical properties of MRE, and the parameters are fitted by the least squares algorithm with Simulink. The analysis of the fitting results shows that the maximum fitting error between the maximum damping force and the dissipation energy is less than 10%, and the average error is less than 5%.

Key words: MRE, mechanical properties, Bouc-Wen model, parameter fitting, fitting error, composites