Multi-scale Electrochemical-mechanical Modeling of Fast Response of Ionic Polymer-Metal Composite Actuator

Authors

1 Shahid Beheshti Univ.

2 Civil, Water, and Environmental Eng., Shahid Beheshti Univ.,

Abstract

Ionic Polymer-Metal Composite (IPMC) strips are very thin actuators in the form of a sandwich composite with an electroactive polymer in the core and two metal electrodes on its sides. In this paper, a multi-scale electrochemical-mechanical analysis of actuation time response of an IPMC composite strip is performed. First, the electrochemical response of IPMC primary motion stemming from electrostatic force, viscous force of ionic cluster motion in the polymer matrix solvent, and diffusive force caused by the concentration potential are obtained by a hydraulic model. The solution methods in the space domain include finite element numerical analysis based on Glerkin's formulation, and Euler's integration method in the time domain. Then, the solvent transport equation is written, and the rate of eigen strain and bending moment of the IPMC actuator is obtained. By extracting the amount of cluster concentration in the boundary layer of cathode and anode, the displacement response of the end of the beam is determined. The results of the model are validated with previous available studies. The results show a reasonable fit between the response of the IPMC actuator and the electrical excitation, and confirm that the presented model provides the prediction of the fast response of IPMC strip.

Keywords

Main Subjects

References

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Journal of Solid and Fluid Mechanics
Volume 13, Issue 6
January and February 2024
Pages 31-46

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