Nonlinear numerical analysis of actuation response of ionic polymer metal composite cantilever considering coupled electrical, chemical, and mechanical fields

Document Type : Research Article

Authors

1 Shahid Beheshti University,Tehran, Iran.

2 Amirkabir University of Technology

Abstract

Ionic-Polymer-Metal-Composite (IPMC) actuators are thin sandwich strips with an electroactive polymer in the middle and two metal electrodes on the sides. The coupling of electric, chemical, and mechanical fields causes bending deformation, as applying a voltage to the electrodes leads to the ion's migration through the thickness. A nonlinear coupled electrochemical mechanical analysis of the actuation response of an IPMC cantilever is performed. From the coupling of chemical and electric fields, the electrochemical response equation is solved by the finite difference and Newton-Raphson methods. This response inserts into the mechanical field. Using the solvent transfer equation, the eigenstrain and bending moment rates are obtained. The cCantilever’s tip deflection is determined by extracting the water coverage in the boundary layer of the cathode and anode. The results are compared and validated with previous available studies. The results show a fit between the response of the actuator and the electrical excitation and confirm the presented model provides the fast response prediction of the strip. Under 1 Volt excitation, the maximum and residual deflections of the cantilever’s end were found 0.11 and 0.04 of the strip length, respectively, and the cation concentration in the middle of the thickness was calculated to be 1150 mol/m3.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 56, Issue 1
2024
Pages 125-146

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