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Title: FRACTURE FAILURE CRITERIA OF SOFC PEN STRUCTURE

Abstract

Thermal stresses and warpage of the PEN are unavoidable due to the temperature changes from the stress-free sintering temperature to room temperature and mismatch of the coefficients 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.

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
960326
Report Number(s):
PNNL-SA-53375
AA2530000; TRN: US200923%%398
DOE Contract Number:
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Advances in Solid Oxide Fuel Cells III; 31st International Conference on Advanced Ceramics and Composites; Ceramic Engineering and Science Proceedings, 28(4):389-402
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; ANODES; CATHODES; CERAMICS; DEFECTS; FRACTURES; MANUFACTURING; SINTERING; SOLID OXIDE FUEL CELLS; STRESSES; THERMAL EXPANSION; THERMAL STRESSES; fracture criteria, SOFC, PEN

Citation Formats

Liu, Wenning N., Sun, Xin, Khaleel, Mohammad A., and Qu, Jianmin. FRACTURE FAILURE CRITERIA OF SOFC PEN STRUCTURE. United States: N. p., 2007. Web.
Liu, Wenning N., Sun, Xin, Khaleel, Mohammad A., & Qu, Jianmin. FRACTURE FAILURE CRITERIA OF SOFC PEN STRUCTURE. United States.
Liu, Wenning N., Sun, Xin, Khaleel, Mohammad A., and Qu, Jianmin. Mon . "FRACTURE FAILURE CRITERIA OF SOFC PEN STRUCTURE". United States. doi:.
@article{osti_960326,
title = {FRACTURE FAILURE CRITERIA OF SOFC PEN STRUCTURE},
author = {Liu, Wenning N. and Sun, Xin and Khaleel, Mohammad A. and Qu, Jianmin},
abstractNote = {Thermal stresses and warpage of the PEN are unavoidable due to the temperature changes from the stress-free sintering temperature to room temperature and mismatch of the coefficients 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Apr 30 00:00:00 EDT 2007},
month = {Mon Apr 30 00:00:00 EDT 2007}
}

Conference:
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