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Junshi Zhang1, Bo Li2, Hualing Chen2

  • 1State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, 710049, China. hlchen@mail.xjtu.edu.cn and School of Aerospace, Xi'an Jiaotong University, Xi'an, 710049, China and Department of Materials Science and Engineering, University of California - Los Angeles, Los Angeles, CA 90095, USA.

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|January 22, 2016
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Summary

This study models dielectric elastomer (DE) dissipation, revealing how viscoelasticity and leakage current impact performance under various voltage inputs. Understanding these factors is key to optimizing DE actuation.

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Area of Science:

  • Materials Science
  • Electromechanical Systems
  • Polymer Physics

Background:

  • Dielectric elastomers (DEs) are advanced materials with significant potential for actuation applications.
  • Their performance is often limited by energy dissipation mechanisms, including viscoelasticity and leakage currents.
  • Quantifying these dissipative effects is crucial for designing reliable and efficient DE devices.

Purpose of the Study:

  • To develop an analytical model for investigating the dissipative performance of dielectric elastomers.
  • To analyze the influence of viscoelasticity and leakage current on DE actuation.
  • To explore the impact of various voltage waveforms on DE dissipative behavior.

Main Methods:

  • An analytical model was developed to simulate DE behavior.
  • Viscoelasticity and leakage current were incorporated into the model.
  • Numerical calculations were performed using various voltage waveforms (DC, square, ramp, sawtooth, triangular).
  • DEs with varying moduli and viscoelasticity intensities were analyzed.

Main Results:

  • Under constant voltage, DE stretch creeps, and total current converges with leakage current.
  • With linearly varying voltage, DEs exhibit significant deformation, with total current exceeding leakage current.
  • Dissipative performance varies significantly across different voltage waveforms and material properties.

Conclusions:

  • The developed model accurately captures the dissipative behavior of dielectric elastomers.
  • Voltage waveform and material properties (modulus, viscoelasticity) critically influence DE energy dissipation.
  • This research provides insights for optimizing DE design and performance by managing dissipation.