Global failure criteria for SOFC positive/electrolyte/negative (PEN) structure

W. N. Liu, X. Sun, M. A. Khaleel, J. M. Qu

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


Due to mismatch of the coefficients of thermal expansion (CTE) of various layers in the PEN (positive/electrolyte/negative) structures of solid oxide fuel cells (SOFC), thermal stresses and warpage on the PEN are unavoidable due to the temperature changes from the stress-free sintering temperature to room temperature during the PEN manufacturing process. In the meantime, additional mechanical stresses will also be created by mechanical flattening during the stack assembly process. In order to ensure the structural integrity of the cell and stack of SOFC, it is necessary to develop failure criteria for SOFC PEN structures based on the initial flaws occurred during cell sintering and stack assembly. In this paper, the global relationship between the critical energy release rate and critical curvature and maximum displacement of the warped cells caused by the temperature changes as well as mechanical flattening process is established so that possible failure of SOFC PEN structures may be predicted deterministically by the measurement of the curvature and displacement of the warped cells.

Original languageEnglish
Title of host publicationSAE Technical Papers
Publication statusPublished - 1 Dec 2007
Externally publishedYes
Event2007 World Congress - Detroit, MI, United States
Duration: 16 Apr 200719 Apr 2007


Other2007 World Congress
CountryUnited States
CityDetroit, MI


ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

Cite this

Liu, W. N., Sun, X., Khaleel, M. A., & Qu, J. M. (2007). Global failure criteria for SOFC positive/electrolyte/negative (PEN) structure. In SAE Technical Papers