TY - JOUR
T1 - Global failure criteria for SOFC positive/electrolyte/negative (PEN) structure
AU - Liu, W. N.
AU - Sun, X.
AU - Khaleel, M. A.
AU - Qu, J. M.
PY - 2007
Y1 - 2007
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85072434110&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85072434110&partnerID=8YFLogxK
U2 - 10.4271/2007-01-0997
DO - 10.4271/2007-01-0997
M3 - Conference article
AN - SCOPUS:85072434110
SN - 0148-7191
JO - SAE Technical Papers
JF - SAE Technical Papers
T2 - 2007 World Congress
Y2 - 16 April 2007 through 19 April 2007
ER -