Title

A Nonlinear Viscoelastic-Viscoplastic Constitutive Model For Ionomer Membranes In Polymer Electrolyte Membrane Fuel Cells

Keywords

Constitutive model; Ionomer membrane; Nafion; PEMFC; Viscoelastic; Viscoplastic

Abstract

This paper describes a phenomenological constitutive model for ionomer membranes in polymer electrolyte membrane fuel cells (PEMFCs). Unlike the existing approaches of elasto-plastic, viscoelastic, and viscoplastic model, the proposed model was inspired by micromechanisms of polymer deformation. The constitutive model is a combination of the nonlinear visco-elastic Bergström-Boyce model and hydration-temperature-dependent empirical equations for elastic modulus of ionomer membranes. Experiment results obtained from an uniaxial tension test for Nafion NR-111 membrane under well controlled environments were compared with simulated results by the finite element method (FEM) and the proposed model showed fairly good predictive capabilities for the large deformation behavior of the Nafion membrane subjected to the uniaxial loading condition in a wide range of relative humidity and temperature levels including liquid water. © 2010 Elsevier B.V. All rights reserved.

Publication Date

4-15-2011

Publication Title

Journal of Power Sources

Volume

196

Issue

8

Number of Pages

3933-3941

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.jpowsour.2010.12.034

Socpus ID

79751535600 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/79751535600

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