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建立准确的本构模型是将磁流变弹性体(magnetorheological elastomers,MREs)应用于结构智能减振的基础。本文以硅橡胶为基体,在有场条件下制备羰基铁粉体积含量为30%的MRE。在不同磁场下测试其储存模量和损耗模量随应变幅值的变化,结果表明MRE的动态力学性能随应变振幅呈非线性变化;继而测试其在不同磁场、不同应变下的松弛曲线,结果表明MRE具有显著的松弛行为,且对应变和磁场具有依赖性。在此基础上,建立MRE的五参数非线性模型,根据试验结果拟合得到不同工况下的模型参数,数值模拟结果与实验数据吻合较好,表明根据松弛行为建立MRE的非线性本构模型是可行的。
The establishment of an accurate constitutive model is the basis for the application of magnetorheological elastomers (MREs) to structural intelligent vibration damping. In this paper, silicone rubber as a matrix in the presence of field conditions for the preparation of carbonyl iron powder volume content of 30% MRE. The changes of storage modulus and loss modulus with strain amplitude under different magnetic fields were measured. The results showed that the dynamic mechanical properties of MRE varied nonlinearly with strain amplitudes. Then the relaxation curves of MRE at different magnetic fields and different strains were tested. The results It shows that MRE has significant relaxation behavior and is dependent on strain and magnetic field. On this basis, a five-parameter nonlinear model of MRE is established, and the model parameters are fitted according to the test results. The numerical simulation results are in good agreement with the experimental data, indicating that the nonlinear constitutive model of MRE is established based on the relaxation behavior It works.