用于线性机电能量转换的软材料

不受不稳定性影响的软机电弹性体

Soft Electromechanical Elastomers Impervious to Instability

本文利用群论方法给出典型介电弹性体致动器分岔问题的闭式解，发现存在临界电场使弹性体在介电击穿前对Treloar-Kearsley不稳定性免疫，从而确立其不受常见失效模式影响的安全工作区间。

A tutorial on the stability and bifurcation analysis of the electromechanical behaviour of soft materials

Soft materials, such as liquids, polymers, foams, gels, colloids, granular materials, and most soft biological materials, play an important role in our daily lives. From a mechanical viewpoint, soft materials can easily achieve large deformations due to their low elastic moduli; meanwhile, surface instabilities, including wrinkles, creases, folds, and ridges, among others, are often observed. In particular, soft dielectrics subject to electrical stimuli can achieve significantly large deformations that are often accompanied by instabilities. While instabilities are often thought to cause failu…

多层电活性管在不同约束条件下的分析

Analysis of multilayer electro-active tubes under different constraints

介电弹性体是一类新兴的高度可变形的电活性材料，用于机电换能技术。对于实际应用，这种换能器的设计需要考虑活性膜的绝缘、电极的非完美顺应行为或换能器与软致动体的相互作用的模型。为此，一个三层模型，其中的主动膜嵌入在两个软被动层之间，可以制定。本文应用非均质软介质的非线性电弹性理论，研究了由活性膜构成的多层电活性管（单层管）和由活性膜构成的多层电活性管（多层管）的机电响应。数值结果显示的机械和几何性质的软涂层上的机电响应的活性膜的影响，提出了不同的约束条件。

Tuning Elastic Waves in Soft Phononic Crystal Cylinders via Large Deformation and Electromechanical Coupling

Soft electroactive materials can undergo large deformation subjected to either mechanical or electrical stimulus, and hence they can be excellent candidates for designing extremely flexible and adaptive structures and devices. This paper proposes a simple one-dimensional soft phononic crystal cylinder made of dielectric elastomer to show how large deformation and electric field can be used jointly to tune the longitudinal waves propagating in the PC. A series of soft electrodes are placed periodically along the dielectric elastomer cylinder, and hence the material can be regarded as uniform in…

Electrostatically tunable axisymmetric vibrations of soft electro-active tubes

Due to their unique electromechanical coupling properties, soft electro-active (SEA) resonators are actively tunable, extremely suitable, and practically important for designing the next-generation acoustic and vibration treatment devices. In this paper, we investigate the electrostatically tunable axisymmetric vibrations of SEA tubes with different geometric sizes. We consider both axisymmetric torsional and longitudinal vibrations for an incompressible SEA cylindrical tube under inhomogeneous biasing fields induced by radial electric voltage and axial pre-stretch. We then employ the state-sp…

Statistical Mechanical Analysis of the Electromechanical Coupling in an Electrically-Responsive Polymer Chain

Polymeric materials that couple deformation and electrostatics have the potential for use in soft sensors and actuators with potential applications ranging from robotic, biomedical, energy, aerospace and automotive technologies. In contrast to the mechanics of polymers that has been studied using statistical mechanics approaches for decades, the coupled response under deformation and electrical field has largely been modeled only phenomenologically at the continuum scale. In this work, we examine the physics of the coupled deformation and electrical response of an electrically-responsive polym…