Electric field-induced surface transformations and experimental dynamic characteristics of dielectric elastomer membranes
Electric field-induced surface transformations and experimental dynamic characteristics of dielectric elastomer membranes
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DOI：
10.1016/j.jmps.2009.03.008
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发表时间：
2009-08-01
影响因子：
5.3
通讯作者：
Goulbourne, N. C.
中科院分区：
文献类型：
--
作者：
Fox, J. W.;Goulbourne, N. C.
单片结构在电场作用下的急剧可调表面变换对自适应结构具有直接意义。变形概念和光学应用。介电弹性体（DE）膜是电场响应材料，通常用作大应变静电致动器。本文证明了电场会产生几种类似于经典鼓面或拉伸膜问题的模态振型的对称表面形状。在之前的实验研究中。在电激发的DE膜上观察到在最初光滑的表面上产生波纹或波浪的单一表面变换。意想不到的结果导致了实验装置的发展，这将有助于广泛表征介电弹性体膜的动态表面变换。新的结果清楚地表明，电场可以用来调整DE表面的图案。此外，如果系统条件有利，当施加周期电场时，膜将发生共振，这是以前从未观察到的。这提供了一个独特的机会来增加DE膜的输出位移而不使膜过载。实验表明，增大膜夹紧腔的尺寸会增加膜的峰值变形，并引起膜共振峰的移位和数量变化。对于驱动功率为1.5 W的DE膜，在最小腔体体积下，最大驱动位移为81 μ m；而在最大的腔容积。最大驱动位移为1431 μ m，这相当于最大极位移增加了1767%。对腔体体积的依赖表明，在动态条件下，需要对DE执行器进行系统级分析。电压偏移作为调制动态变形响应的一种手段的影响也在本研究中被报道。2009爱思唯尔有限公司版权所有。
Acute and tunable surface transformations of a monolithic structure by application of an electric field have immediate significance for adaptive Structures. morphing concepts and optical applications. Dielectric elastomer (DE) membranes are electric field-responsive materials typically employed as large strain electrostatic actuators. In this paper, it is demonstrated that an electric field will generate several symmetric surface shapes analogous to the mode shapes in the classical drumhead or stretched membrane problem. In a previous experimental study. a single surface transformation creating ripples or waves on an initially smooth surface was observed for an electrically excited DE membrane. The unexpected result led to the development of an experimental setup that would facilitate extensive characterization of the dynamic surface transformations of dielectric elastomer membranes. The new results clearly show that the electric field can be used to tune the patterns of the DE surface. Furthermore, the membrane will go through resonance when a periodic electric field is applied if the system conditions are favorable, which has not been observed before now. This presents a unique opportunity to increase the output displacement of DE membranes without electrically overloading the membrane. The experiments show that increasing the size of the chamber onto which the membrane is clamped will increase the peak deformation as well as cause the membrane's resonance peaks to shift and change in number. For DE membranes driven at 1.5 W, at the smallest chamber volume, the maximum actuation displacement is 81 mu m; while at the largest chamber volume. the maximum actuation displacement is 1431 mu m. This corresponds to a 1767% increase in maximum pole displacement. The dependence on chamber volume suggests that under dynamic conditions a systems level analysis is needed for DE actuators. The effect of voltage offset as a means of modulating the dynamic deformation response is also reported in this study. (C) 2009 Elsevier Ltd. All rights reserved.