Crack formation on membrane electrode assembly (Mea) under static and cyclic loadings

Yusuke Kai, Yuki Kitayama, Masaki Omiya, Tomoaki Uchiyama, Manabu Kato

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

Mechanical reliabilities of membrane electrode assemblies (MEA) in polymer electrolyte fuel cells (PEFCs) are a major concern to fuel cell vehicles. Hygro-thermal cyclic conditions induce the mechanical stress in MEA and cracks are formed under operating conditions. The purpose of this paper is to understand the failure mechanism of MEA under several mechanical and environmental conditions for the critical design of durable PEFCs. We carried out both static tensile tests and low cycle fatigue tests for MEA. For tensile tests, temperature and humidity in a test chamber were controlled and the surface crack formation of MEA was observed by a video micro scope in situ. Low cycle fatigue tests were carried out in room condition and the number of cycles to crack formation was measured. The results showed that the mechanical properties of MEA were influenced by temperature and humidity. The observations of MEA during tensile tests revealed that cracks were formed on the surface of catalyst layers just after the yielding of MEA. This result indicates that the deformation mismatch between catalyst layer and proton exchange membrane (PEM) is an important parameter to suppress the crack formation in MEA. The results of low cycle fatigue tests revealed that the fatigue strength of MEA followed the Coffin-Manson law and the fatigue design of MEA based on the Coffin-Manson law is possible. This result is valuable for the critical design of durable PEFCs.

Original languageEnglish
Title of host publicationASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology Collocated with the ASME 2012 6th International Conference on Energy Sustainability, FUELCELL 2012
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages143-151
Number of pages9
ISBN (Print)9780791844823
DOIs
Publication statusPublished - 2012 Jan 1
EventASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology, FUELCELL 2012 Collocated with the ASME 2012 6th International Conference on Energy Sustainability - San Diego, CA, United States
Duration: 2012 Jul 232012 Jul 26

Publication series

NameASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology Collocated with the ASME 2012 6th International Conference on Energy Sustainability, FUELCELL 2012

Other

OtherASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology, FUELCELL 2012 Collocated with the ASME 2012 6th International Conference on Energy Sustainability
CountryUnited States
CitySan Diego, CA
Period12/7/2312/7/26

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ASJC Scopus subject areas

  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment

Cite this

Kai, Y., Kitayama, Y., Omiya, M., Uchiyama, T., & Kato, M. (2012). Crack formation on membrane electrode assembly (Mea) under static and cyclic loadings. In ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology Collocated with the ASME 2012 6th International Conference on Energy Sustainability, FUELCELL 2012 (pp. 143-151). (ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology Collocated with the ASME 2012 6th International Conference on Energy Sustainability, FUELCELL 2012). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/FuelCell2012-91164