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Fabrication Process of Silicone-based Dielectric Elastomer Actuators

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Compressible dielectric elastomer actuators in high hydrostatic pressures: Models and experiments.

Xianghan Wang¹, Bingxu Hu¹, Yang Zhang¹

¹Qingdao Innovation and Development Base, <a href="https://ror.org/03x80pn82">Harbin Engineering University</a>, Qingdao 266000, China.

Physical Review. E

|December 18, 2024

Summary

This study models and tests dielectric elastomer actuators (DEAs) under extreme hydrostatic pressures up to 105 MPa. Findings reveal elastomer stiffening, reduced strain, and increased breakdown fields, crucial for deep-sea soft robotics.

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Area of Science:

Materials Science
Robotics
Polymer Science

Background:

Dielectric elastomer actuators (DEAs) are promising soft actuators for extreme environments like deep-sea exploration due to their inherent compliance.
However, their performance under high hydrostatic pressures is poorly understood, limiting their practical application.
Existing theoretical models and experimental techniques are insufficient for characterizing DEAs under such conditions.

Purpose of the Study:

To develop a coupled theoretical model for DEAs under hydrostatic pressure.
To introduce novel experimental techniques for characterizing DEA behavior under high hydrostatic pressures.
To investigate the effects of hydrostatic pressure on DEA mechanical and electromechanical properties.

Main Methods:

Development of a hydrostatic pressure-coupled DEA model.
Implementation of experimental characterization techniques for DEAs under hydrostatic pressure.
Testing DEAs at pressures up to 105 MPa, simulating deep-sea conditions.

Main Results:

Observed stiffening of the elastomer with increasing hydrostatic pressure.
Quantified reduction in actuation strain under high hydrostatic compression.
Reported an increase in the electrical breakdown field strength of DEAs at elevated pressures.
Model predictions align with experimental observations.

Conclusions:

Hydrostatic pressure significantly alters DEA properties, including mechanical stiffness, actuation strain, and electrical breakdown strength.
The developed model and experimental methods provide accurate characterization of DEAs under high hydrostatic pressures.
This research offers essential guidelines for designing robust DEAs for deep-sea applications and advanced soft robotic systems.