Wave reflection by the free boundary of a microstructured flexoelectric half-space
TL;DR: In this article, the field equations of isotropic dielectrics with centrosymmetric microstructures are specialized to take into account the effects of micro-inertia, flexoelectricity, and non-uniform strain.
Abstract: Taking into consideration the effects of micro-inertia, flexoelectricity, and non-uniform strain, the field equations of isotropic dielectrics with centrosymmetric microstructures are specialized f...
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TL;DR: In this paper , a unified model for studying the dynamical flexoelectricity by including effects of the micro-inertia, dynamical polarization, and the dynamic flexocoupling between displacement and polarization upon the mechanical and electrical states of the dielectric material was proposed.
Abstract: The present work proposes a unified model for studying the dynamical flexoelectricity by including effects of the micro-inertia, the dynamical polarization, and the dynamical flexocoupling between displacement and polarization upon the mechanical and electrical states of the dielectric material. The mathematical description is presented in the framework of strain gradient elasticity. Using the variational technique for internal energies and external forces, the governing equations are derived with their concomitant boundary conditions for homogeneous anisotropic flexoelectric materials. The focus is on the study of the effects of such dynamical size-dependent and dynamical flexocoupling tensor on the class of centrosymmetric isotropic dielectric materials, which referred to as the flexoelectric effect, by means of the integral transform technique. A one-dimensional application is presented for a semi-infinite flexoelectric material. The solution is obtained using the integral transform method, precisely, the Laplace transform. The strontium titanate (STO) is chosen for the numerical simulation. It is emphasized that the size-dependent factor diminishes the dynamical wave feature of the response variables. Otherwise, the flexocoupling parameter is found to play a key role in polarization production inside the dielectric medium.
5 citations
TL;DR: In this paper, the propagation pattern of Shear horizontal (SH) wave in a piezo-composite layered cylinder is investigated. But the authors mainly focus on interpreting the propagation patterns of the Shear wave.
Abstract: Present study primarily focuses on interpreting the propagation pattern of Shear horizontal (SH) wave in a piezo-composite layered cylinder. The structure consists of three concentric cylinders com...
1 citations
01 Jan 2008
TL;DR: In this paper, BaTiO3/CoFeFeFe2O4 composites composites were used to construct piezomagnetic piezomsagnetic composites, which are used in the CoFe2o4/BaTiO2O3 composites.
Abstract: 这份报纸在分层的周期的 composites 由组成涉及波浪繁殖的动态行为压电并且 piezomagnetic 阶段。兰姆波浪的分散关系被导出。分散曲线和排水量地与不同压电的体积部分被计算。分散弄弯的 BaTiO3/CoFe2O4 composites 表演的数字结果在一个盘子中类似于对称的兰姆波浪。交换在之间纵(即厚度) 模式和联合模式发生在在开始的二个分支的分散曲线之间的转线路点。随 BaTiO3 体积部分的增加，转线路点在一个更低的波浪数字出现，波浪速度更高。这些调查结果为磁电的变换器应用程序是有用的。
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3,323 citations
TL;DR: In this paper, an equilibrium relation is developed to govern the behavior of the couples, which constrained the couple stress tensor to be symmetric, and the symmetric curvature tensor became the only properly conjugated high order strain measures in the theory to have a real contribution to the total strain energy of the system.
2,725 citations
TL;DR: In this paper, a study of the linear theory of elasticity in which the potential energy-density depends on the gradient of the strain in addition to the strain was performed, and the relations connecting the stresses in the three forms and the boundary conditions in three forms were derived.
1,323 citations
TL;DR: Flexoelectricity is a universal effect allowed by symmetry in all materials as discussed by the authors and has been studied in many nanoscale systems, and potential applications of this electromechanical phenomenon have been discussed.
Abstract: Flexoelectricity—the coupling between polarization and strain gradients—is a universal effect allowed by symmetry in all materials. Following its discovery several decades ago, studies of flexoelectricity in solids have been scarce due to the seemingly small magnitude of this effect in bulk samples. The development of nanoscale technologies, however, has renewed the interest in flexoelectricity, as the large strain gradients often present at the nanoscale can lead to strong flexoelectric effects. Here we review the fundamentals of the flexoelectric effect in solids, discuss its presence in many nanoscale systems, and look at potential applications of this electromechanical phenomenon. The review also emphasizes the many open questions and unresolved issues in this developing field.
767 citations
TL;DR: This work has shown that not only the intensity of the response of the immune system to carbon dioxide but also its ability to reprogram theresponse of the nervous system to accommodate high levels of carbon dioxide.
Abstract: Note: Tagantsev, Ak Af Ioffe Engn Phys Inst,Leningrad 194021,UssrPart 2E4504Times Cited:19Cited References Count:16 Reference LC-ARTICLE-1986-010doi:10.1103/PhysRevB.34.5883 Record created on 2006-08-21, modified on 2017-11-27
583 citations