Please use this identifier to cite or link to this item: https://rda.sliit.lk/handle/123456789/200
Title: Mechanical degradation of fuel cell membranes under fatigue fracture tests
Authors: Khorasany, Ramin M.H
Alavijeh, A. S
Kjeang, E.
Wang, G.G.
Rajapakse, R. K. N. D
Keywords: Fuel cell
Membrane
Fatigue
Fracture
Degradation
Durability
Issue Date: 1-Jan-2015
Publisher: Elsevier
Citation: 82
Series/Report no.: Journal of Power Sources;Vol 274, Pages 1208-1216
Abstract: The effects of cyclic stresses on the fatigue and mechanical stability of perfluorosulfonic acid (PFSA) membranes are experimentally investigated under standard fuel cell conditions. The experiments are conducted ex-situ by subjecting membrane specimens to cyclic uniaxial tension at controlled temperature and relative humidity. The fatigue lifetime is measured in terms of the number of cycles until ultimate fracture. The results indicate that the membrane fatigue lifetime is a strong function of the applied stress, temperature, and relative humidity. The fatigue life increases exponentially with reduced stresses in all cases. The effect of temperature is found to be more significant than that of humidity, with reduced fatigue life at high temperatures. The maximum membrane strain at fracture is determined to decrease exponentially with increasing membrane lifetime. At a given fatigue life, a membrane exposed to fuel cell conditions is shown to accommodate more plastic strain before fracture than one exposed to room conditions. Overall, the proposed ex-situ membrane fatigue experiment can be utilized to benchmark the fatigue lifetime of new materials in a fraction of the time and cost associated with conventional in-situ accelerated stress testing methods.
URI: http://localhost:8080/jspui/handle/123456789/200
ISSN: 0378-7753
Appears in Collections:Research Papers - Department of Civil Engineering
Research Papers - SLIIT Staff Publications

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