Thermo-Mechanical Response of Fuel Cell Electrodes: Constitutive Model and Application in Studying the Structural Response of Polymer Electrolyte Fuel Cell

Title
Thermo-Mechanical Response of Fuel Cell Electrodes: Constitutive Model and Application in Studying the Structural Response of Polymer Electrolyte Fuel Cell
Authors
조종두
Issue Date
2013
Publisher
FUEL CELLS
Series/Report no.
FUEL CELLS; vol.13 no.2 startpage 217 endpage 226
Abstract
The characterization of the mechanical properties of fuel cell electrodes through the experimental techniques is a complex task due to the low thickness, constituents’ heterogeneous composition, and fragile nature of the film. We present a preliminary investigation on the thermomechanical response of fuel cell catalyst layer (CL) obtained through the numerical experiment. Since the Nafion ionomer is one of the constituents’ of the CL, a modified micromechanically motivated viscoplastic model is adopted to characterize the Nafion ionomer in terms of reduced density factor to account for the void content. The catalyst agglomerates are taken as inclusions in the ionomer matrix to form a compo- site unit which is used to plot the true stress?true strain response. Practicality of this work is tested by implementing the electrode layer as a separate component in the single fuel cell unit cell model. A remarkable difference in the magni- tude of stress levels in the membrane is observed under thermal and hydrated conditions with the presence and absence of electrode layer in the simulation domain. The present work will assist in improved understanding of the localized stress distribution in the membrane, which is essential to understand its mechanical endurance. Keywords: Deformation, Durability, Fuel Cell Electrode, Hydration/Dehydration Cycle, Micromechanical Model, Nafion, Numerical Simulation, Polymer Electrolyte Fuel Cell, Thermomechanical Response
URI
http://dspace.inha.ac.kr/handle/10505/31340
ISSN
1615-6846
Appears in Collections:
College of Engineering(공과대학) > Mechanical Engineering(기계공학) > Local Access Journal Papers, Reports(기계공학 논문, 보고서)

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