Biaxial fatigue crack growth in proton exchange membrane of fuel cells based on cyclic cohesive finite element method

Y. X. Wang, X. Guo, S. W. Shi, G. J. Weng, G. Chen, J. Lu

Research output: Contribution to journalArticlepeer-review

Abstract

During the operation of proton exchange membrane in fuel cells, cyclic mechanical loads are introduced due to the humidity cycles. The resulting fatigue crack is known to be the main source for its mechanical degradation. In this paper, we use a relation between damage evolution of the cohesive elements and Paris law to simulate the biaxial fatigue crack growth. The effects of various loading conditions are investigated. The predicted crack growth is in a good agreement with experimental studies. Both the transverse stress and the tensile overload have retardation effects. It is also found that the fatigue crack growth rate associated with a shorter pre-crack depends more on the load waveform. Moreover, fatigue crack grows faster under the low-high loading history than the high-low one. These simulation results have provided significant insights into the fatigue failure behavior of membranes during operation conditions and can help improve their durability.

Original languageEnglish (US)
Article number105946
JournalInternational Journal of Mechanical Sciences
Volume189
DOIs
StatePublished - Jan 1 2021

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • Biaxial fatigue crack growth
  • Cohesive element
  • Durability
  • Loading condition
  • Proton exchange membrane fuel cell
  • Retardation effect

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