Damping mechanism and theoretical model of electrorheological elastomers
Damping mechanism and theoretical model of electrorheological elastomers
复制标题
电流变弹性体的阻尼机理及理论模型
DOI：
10.1039/c7sm00872d
复制
发表时间：
2017-08-28
期刊：
影响因子：
3.4
通讯作者：
Qi, Min
中科院分区：
文献类型：
--
作者：
Niu, Chenguang;Dong, Xufeng;Qi, Min
电流变弹性体作为一种智能软材料，在外加电场作用下具有阻尼可调、动态模量可调的特性。以往的研究大多集中在其动态模量上，而忽略了阻尼性能的研究。在这项研究中，两种含有裸TiO2和硅烷偶联剂改性的TiO2颗粒的ERE的阻尼能力进行了测试和比较作为应变振幅的函数。结果表明，当应变幅值超过10%时，改性TiO2颗粒填充弹性体的阻尼性能降低，表明改性TiO2颗粒增强了界面强度，降低了界面摩擦力。建立了描述电弹性体阻尼行为的理论模型，将其分为固有阻尼、界面阻尼和电场诱导阻尼。实验结果与该模型给出的不同电场强度下的阻尼曲线吻合较好，含裸TiO2颗粒和含改性TiO2颗粒的ERE的阻尼能力差异主要归因于弱结合和强结合界面阻尼的影响。
As a smart soft material, electrorheological elastomers (EREs) present tunable damping capacity and adjustable dynamic moduli on applying an electric field. Most of the previous studies focused on their dynamic moduli, while the damping performance has been neglected. In this study, the damping capacity of two kinds of EREs containing bare TiO2 and silane coupling agent-modified TiO2 particles were tested and compared as a function of strain amplitude. The results indicate that the modified TiO2 particle filled EREs present lower damping capacity when the strain amplitude exceeds 10%, indicating that the interfacial friction between the modified TiO2 particles and the matrix is decreased due to the stronger interface strength. A theoretical model is developed to describe the damping behaviour of the EREs, which is divided into the intrinsic damping, the interface damping and the electric field induced damping. The experimental results are well matched with the damping curves given by this model under various electric field strengths, and the difference between the damping capacity of the ERE containing bare TiO2 particles and the one containing modified TiO2 particles can be mainly ascribed to the effect of weakly and strongly bonded interface damping.