Fracture failure criteria of SOFC PEN structure

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

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


Thermal stress and warpage of the PEN are unavoidable due to the temperature change from the stress-free sintering temperature to room temperature and mismatch of the coefficient of thermal expansion (CTE) of various layers in the PEN structures of solid oxide fuel cells (SOFC) during the PEN manufacturing process. In the meantime, additional mechanical stresses will also be created by mechanical flattening during the stack assembly process. The porous nature of anode and cathode in the PEN structures determines presence of the initial flaws and crack on the interfaces of anode/electrolyte/cathode and in the interior of the materials. The sintering/assembling induced stresses may cause the fracture failure of PEN structure. Therefore, fracture failure criteria for SOFC PEN structures is developed in order to ensure the structural integrity of the cell and stack of SOFC In this paper, the fracture criteria based on the 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 publicationCeramic Engineering and Science Proceedings
Number of pages12
Publication statusPublished - 22 Dec 2008
Externally publishedYes
Event31st International Conference on Advanced Ceramics and Composites - Daytona Beach, FL, United States
Duration: 21 Jan 200726 Jan 2007


Other31st International Conference on Advanced Ceramics and Composites
CountryUnited States
CityDaytona Beach, FL


ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Liu, W. N., Sun, X., Khaleel, M. A., & Qu, J. M. (2008). Fracture failure criteria of SOFC PEN structure. In Ceramic Engineering and Science Proceedings (4 ed., Vol. 28, pp. 389-400)