A continuum-based, three-dimensional and electro-chemo-mechanical (ECM) model for a hydrated polymer membrane is presented. Different effects are taken into account: (i) mechanics, (ii) water uptake, (iii) ion transport, and (iv) electrostatics. The dissipation inequality drives the choice of the suitable constitutive equations of the multi-physics theory. In the mechanical field, an additive decomposition of the deformation gradient in (i) a distortion part, related to the ion motion, and (ii) an elastic part, is assumed. The multi-field model is numerically solved within the finite element framework. Time-dependent simulations are performed by using the commercial tool COMSOL Multiphysics. Furthermore, two closed form solutions are obtained by using (i) a one-dimensional reduced model and (ii) an approach based on the bar theory with an electro-chemical distortion field.
ACCESS THE FULL ARTICLE
Marco Rossi, Thomas Wallmersperger, Jorge Alejandro Ramirez, Paola Nardinocchi, "Thermodynamically consistent electro-chemo-mechanical model for polymer membranes," Proc. SPIE 10594, Electroactive Polymer Actuators and Devices (EAPAD) XX, 105940K (27 March 2018);