|
An improved theoretical mode of electrical response of normal mode shock wave compressed ferroelectric ceramics is introduced in this paper. We not only consider the relaxation for the dielectric and conductivity of the ferroelectric material but also take account of the shock front traveling in the specimen. Calculations show that the mode is accord with experiments. 考虑了铁电介质的介电松弛和电导率松弛 ,计及冲击波阵面在样品中传播过程的影响 ,改进了垂直模式冲击波加载铁电陶瓷电响应的理论 ,且理论分析与实验结果基本一致 : An improved theoretical mode of electrical response of normal mode shock stress compressed ferroelectric ceramics is introduced . The relaxation for the dielectric and conductivity of the ferroelec-tric material are considered as well as the shock front traveling in the specimen. Calculations show that the mode is accord with experiments. 考虑了铁电介质的介电松弛和电导率松弛,及冲击波阵面在样品中传播过程的影响,改进了垂直模式冲击应力作用下铁电陶瓷电响应的理论,且理论分析与实验结果基本一致。 Using self-consistent mean field theory and series perturbative expansion, we investigated the nonlinear response of a nonlinear ER fluid consisting of nonlinear spherical particles and linear substrate. Under a sinusoidal (ac) field, the electrical response of a nonlinear ER fluid contains generally the contributions of higher-order harmonics. We give the dipole moment of nonlinear spherical particles its harmonic response. Further, we obtain the analytic expressions of the higher harmonics of dipole... Using self-consistent mean field theory and series perturbative expansion, we investigated the nonlinear response of a nonlinear ER fluid consisting of nonlinear spherical particles and linear substrate. Under a sinusoidal (ac) field, the electrical response of a nonlinear ER fluid contains generally the contributions of higher-order harmonics. We give the dipole moment of nonlinear spherical particles its harmonic response. Further, we obtain the analytic expressions of the higher harmonics of dipole moment and the averaged local field. Our numerical results show that it is important to take the multiple image interaction into account in the case of small distance between particles and large dielectric contrast. 借助于自洽平均场理论和微扰展开法,研究了非线性ER流体的交变电流效应,导出具有非线性介电响应的球形颗粒在交变电场下的平均电偶极矩以及它的谐波效应,进一步获得了高阶谐波的平均电偶极矩和局域电场.研究结果表明,当颗粒间距较小以及ER流体组分的介电常数配比较大时,必须考虑颗粒间的多极矩相互作用.
|