硅橡胶基磁流变弹性体动态力学性能试验与本构建模

摘要

A parametric constitutive model in a simple form and with clear physical meaning was established to deduce the expression of dynamic mechanical modulus of MREs.Meanwhile,in consideration of the pressure stress on MREs in the experiment of shear mechanical properties or the application to vibration damper,some improvements are made on the particle chain model based on the coupled field.In addition,in order to verify the accuracy of the overall model,five groups of MREs samples based on silicone rubber with different volume fractions were prepared,and the MCR51 rheometer was used to conduct the experiment of dynamic mechanical properties based on frequency and magnetic field scanning.Finally,experimental results indicate that the established model fits well with laboratory data,namely,the relationship between the dynamic modulus of MREs and changes in frequency and magnetic field is well described by the model.%建立了一种形式简单但物理意义明确的参数化本构模型,并利用该模型推导出了磁流变弹性体的动态力学模量表达式.同时,考虑到当磁流变弹性体在进行剪切力学性能测试或应用到减振装置中时,均会受到一定的压应力,故对基于耦合场的颗粒链模型进行了改进.为了验证整体模型的正确性,制备了5组不同体积分数的硅橡胶基磁流变弹性体样品,利用MCR51流变仪对该样品进行了频率与磁场扫描下的动态力学性能测试.结果表明,建立的模型与实验数据吻合较好,即说明该模型能较好地描述磁流变弹性体的动态模量与频率及磁场的变化关系.