Theory of dielectric elastomers capable of giant deformation of actuation.
Theory of dielectric elastomers capable of giant deformation of actuation.
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DOI：
10.1103/physrevlett.104.178302
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发表时间：
2010-04
影响因子：
8.6
通讯作者：
Xuanhe Zhao;Z. Suo
中科院分区：
文献类型：
--
作者：
Xuanhe Zhao;Z. Suo
如果电介质是硬的，则由电压引起的电介质变形受电击穿的限制，如果电介质是柔顺的，则受机电不稳定性的限制。分析了一种介电弹性体的两种失稳模式的相互作用，该弹性体在小拉伸时是柔顺的，但在急剧变硬。用最近的互穿网络实验和膨胀弹性体模型说明了这一理论。该理论预测，对于具有理想形式的应力-拉伸曲线的弹性体，电压会引起巨大的变形。
The deformation of a dielectric induced by voltage is limited by electrical breakdown if the dielectric is stiff, and by electromechanical instability if the dielectric is compliant. The interplay of the two modes of instability is analyzed for a dielectric elastomer, which is compliant at a small stretch, but stiffens steeply. The theory is illustrated with recent experiments of interpenetrating networks, and with a model of swollen elastomers. The theory predicts that, for an elastomer with a stress-stretch curve of a desirable form, the voltage can induce giant deformation.