避免介电弹性体薄膜的拉入不稳定性以及潜在的增加致动和能量收集。

Avoiding the pull-in instability of a dielectric elastomer film and the potential for increased actuation and energy harvesting.

机构信息

Department of Mechanical Engineering, University of Houston, Houston, TX 77204, USA.

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA and Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

出版信息

Soft Matter. 2017 Jul 14;13(26):4552-4558. doi: 10.1039/c7sm00542c. Epub 2017 Jun 19.

DOI:10.1039/c7sm00542c

PMID:28628169

Abstract

Pull-in instability often occurs when a film of a dielectric elastomer is subjected to an electric field. In this work, we concoct a set of simple, experimentally implementable, conditions that render the dielectric elastomer film impervious to pull-in instability for all practical loading conditions. We show that a uniaxially pre-stretched film has a significantly large actuation stretch in the direction perpendicular to the pre-stretch and find that the maximal specific energy of a dielectric elastomer generator can be increased from 6.3 J g to 8.3 J g by avoiding the pull-in instability.

摘要

当介电弹性体薄膜受到电场作用时，通常会发生拉入不稳定性。在这项工作中，我们设计了一组简单的、可通过实验实现的条件，使介电弹性体薄膜在所有实际的加载条件下都不会受到拉入不稳定性的影响。我们表明，单轴预拉伸薄膜在垂直于预拉伸的方向上具有显著大的驱动拉伸，并且发现通过避免拉入不稳定性，可以将介电弹性体致动器的最大比能量从 6.3 J/g 增加到 8.3 J/g。