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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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A Thermo-Electro-Viscoelastic Model for Dielectric Elastomers.

Bao Qin1, Zheng Zhong2, Tong-Yi Zhang3

  • 1Research Institute of Interdisciplinary Science & School of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, China.

Materials (Basel, Switzerland)
|September 9, 2023
PubMed
Summary

This study presents a thermo-electro-viscoelastic model for dielectric elastomers (DEs). The model accurately simulates DE behavior under various conditions, aiding in predicting and preventing material failure in applications.

Keywords:
dielectric elastomersfinite deformationthermo-electro-viscoelasticitythermodynamic consistency

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Area of Science:

  • Materials Science
  • Polymer Physics
  • Continuum Mechanics

Background:

  • Dielectric elastomers (DEs) are electro-active polymers with significant deformation capabilities, promising for robotics and biomedical devices.
  • Stretching rate, temperature, and electric fields critically influence DE stress-strain behavior, potentially leading to application failure.

Purpose of the Study:

  • To develop a comprehensive thermo-electro-viscoelastic model for DEs at finite deformation.
  • To simulate the nonlinear stress-strain relationships of DEs under diverse thermo-electro-mechanical loading conditions.

Main Methods:

  • A thermodynamically consistent continuum theoretical framework was established for coupled thermo-electro-mechanical problems.
  • Specific constitutive equations were formulated to describe the thermo-electro-viscoelastic properties of DEs.
  • The model was validated against experimental data for VHB4905, including a temperature-dependent equilibrium modulus function.

Main Results:

  • The developed model accurately predicts nonlinear loading-unloading curves for VHB4905 under various conditions.
  • The simulation results reveal temperature-induced softening phenomena in DEs.
  • The electric field was shown to induce instant pre-stretch in the dielectric elastomers.

Conclusions:

  • The validated model effectively simulates the thermo-electro-viscoelastic behavior of dielectric elastomers.
  • This work provides a theoretical basis for analyzing DE failure mechanisms under complex environmental and electrical loads.
  • Understanding these behaviors is crucial for optimizing DE performance and reliability in advanced applications.