A Research on Deformation and Breakdown Behavior of Dielectric Elastomer Actuators Under Dynamic Electrical Loads

doi:10.7652/xjtuxb201902002

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A Research on Deformation and Breakdown Behavior of Dielectric Elastomer Actuators Under Dynamic Electrical Loads

更新时间：2025-07-09

- A Research on Deformation and Breakdown Behavior of Dielectric Elastomer Actuators Under Dynamic Electrical Loads
- Vol. 53, Issue 2, Pages: 9-15+127(2019)
- 作者机构：
  
  西安交通大学机械工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201902002
  CLC： TP24;TH145.4
- Online First：10 February 2019，
  
  Published：2019
- 稿件说明：
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A Research on Deformation and Breakdown Behavior of Dielectric Elastomer Actuators Under Dynamic Electrical Loads[J]. 2019, 53(2): 9-15+127.
DOI：

A Research on Deformation and Breakdown Behavior of Dielectric Elastomer Actuators Under Dynamic Electrical Loads[J]. 2019, 53(2): 9-15+127. DOI： 10.7652/xjtuxb201902002.

摘要

针对介电弹性体(DE)驱动器驱动性能难以预测的问题

以VHB4910薄膜为待测DE材料

圆形DE驱动器作为研究对象

针对低频条件下(0.1～10 Hz)DE驱动器的动态变形与击穿行为展开了实验研究。搭建了力电耦合实验测试平台

通过实验归纳了驱动电压参数对DE驱动器动态变形和击穿的影响规律。实验结果表明:DE驱动器的动态变形平衡位置受到电压幅值的影响

动态变形的振幅则受到电压频率和幅值的共同制约。动态击穿电压的数值分散性强

难以得到明显的规律特征

因此不能准确对动态击穿行为进行表征

而通过实验发现DE驱动器能承受的电压循环周期数会受到多种驱动电压参数的显著影响

故提出采用电压循环周期数对动态击穿行为进行分析。借鉴机械循环载荷下的经典疲劳曲线方程

提出利用名义静电应力幅值代替机械应力幅值、对DE驱动器在动态电压下的电致疲劳寿命曲线进行拟合的方法

以期为动态电压作用下DE驱动器的寿命预测提供一种新思路。

Abstract

Dielectric elastomer based actuators(DEAs)is regularly subjected to dynamic electric loads to produce reciprocating deformations and its driving performance such as deformation response and breakdown behavior is affected by various driving voltage parameters. The relevant changing laws are unrevealed

and it is difficult to predict its critical breakdown condition in applications. The dynamic deformation and breakdown behaviors of circular DEAs based on VHB4910 film are experimentally investigated

and the changing rules of driving voltage parameters on the dynamic deformation and breakdown behavior of DEA are summarized. The experimental results show that the dynamic deformation equilibrium positions of the DEAs are affected by the voltage amplitude and the deformation amplitudes are influenced by both the frequency and amplitude of the voltage. Moreover the dynamic breakdown voltages of DEAs appear to be scattered with no obvious regularity

while the dynamic voltage cycle index of DEAs is significantly affected by driving voltage parameters. Finally

the classical fatigue curve equation under the mechanical cycle loads is referred to propose a formula that is used to characterize the electric fatigue curve of DEA by replacing the mechanical stress amplitude with the nominal electrostatic stress. This study provides a new way for predicting the dynamic voltage cycle index of DEA under dynamic voltages.

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