介电弹性体材料预拉伸率对电致应变特性的影响

摘要

为了在相同的激励电压下获得更大的应变率,介电弹性体的预拉伸率必须经过合理选取,为此对比了常见的三种超弹性材料模型(Mooney-Rivlin模型、Yeoh模型和Ogden模型),然后选用Yeoh超弹性材料模型进行了理论推导,解出了应变随激励电压和预拉伸率变化的关系曲线,并通过M atlab进行了仿真分析.结果表明:在不同预拉伸率下,膜型材料的电致应变特性差异较大,且对于一定的应变率,预拉伸率-激励电压曲线存在最优解.%In order to get lager strain under same excitation voltage,the pre-strained rate of dielectric elastomer must be considered,thus this paper contrasts three hyperelastic models(Mooney-Rivlin, Yeoh and Ogden)and works out the equation between strain,activation voltage and pre-stretch.The simulation analysis is completed with Yeoh model and software Matlab.The results show that electro-strictive strain characteristics are greatly distinctive at different pre-strained rate and optimal values of pre-strained rate are certified under given nominal radial strains.