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杨帆,侯振德*,张国立,富东慧,屈川.电极面积对介电弹性体薄膜电致起皱影响的实验研究[J].实验力学,2018,33(4):509~516
电极面积对介电弹性体薄膜电致起皱影响的实验研究
An experimental study on the effect of electrode area on electric wrinkling of dielectric elastomer film
投稿时间: 2017-03-29  最后修改时间: 2017-05-08
DOI:10.7520/1001-4888-17-079
中文关键词:  介电弹性体  单向拉伸  电极长度  起皱  临界电压  波长
英文关键词:dielectric elastomer  uniaxial tension  electrode length  wrinkling  critical voltage  wavelength
基金项目:国家自然科学基金(11672350)
作者单位
杨帆 天津大学 机械工程学院力学系 天津 300354 
侯振德* 天津大学 机械工程学院力学系 天津 300354 
张国立 天津大学 机械工程学院力学系 天津 300354 
富东慧 天津大学 机械工程学院力学系 天津 300354 
屈川 天津大学 机械工程学院力学系 天津 300354 
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中文摘要:
      介电弹性体(dielectric elastomers,DE)薄膜在其自身的应变能和外加电场能的相互作用下既能实现大的电致变形,也容易发生失稳起皱。对于单轴预拉伸的介电弹性体薄膜,电极的长度是决定其电致变形的重要参数,同时也可能是影响薄膜起皱的关键因素。为了确定以及量化该影响,本文实验测量了不同电极长度下薄膜的临界起皱电压。同时为了分析薄膜的褶皱特征,测量了不同电压下的褶皱波长。实验结果表明:电极宽度对介电弹性体薄膜的起皱有较大影响;随着电极长度逐渐增大,薄膜的临界起皱电压呈现出先快速减小,随后相对稳定,最后又逐渐升高的趋势。而其褶皱波长随电压升高逐渐减小。实验结果显示,褶皱分布在电极及电极附近,据此分析认为,薄膜的起皱是一种局部效应,电极区与非电极区的相互作用与能量传递对其有较大影响。实验中通过铜丝搭接的方式引出电极能有效解决电极引出线的附加刚度影响薄膜起皱的问题,可为相关实验提供技术参考。
英文摘要:
      Prestretched dielectric elastomer (DE) film not only can achieve large electric-field induced deformation but also is prone to wrinkling, under the interaction of its own strain energy and the applied electric field energy. For a uniaxially pre-stretched dielectric elastomer film, the electrode area is an important parameter to the electric-field induced deformation, and may also be a key factor affecting the film wrinkling. To determine and quantify the effect, critical wrinkling voltages of the film with different electrode areas were measured, and the wrinkle wavelengths were obtained simultaneously for analyzing the wrinkling characteristics. Experimental results indicate when the electrode area is smaller the wrinkling voltage is higher, and with the increases of electrode area, the wrinkling voltage decreases rapidly until a specific area. After that, the wrinkling voltage becomes larger gradually with the increases of the area. While the wrinkle wavelength decreases gradually with the increase of voltage monotonically. Analysis believes that the film wrinkling is a kind of local effect, the interaction and the energy transfer between electrode region and non-electrode region have great influence on wrinkling. In the experiment, very thin copper wires are used as the electrode leads that just contact with the electrodes, which can avoid the stiffness of the leads affecting the wrinkling.
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