Global Failure Criteria for SOFC Positive/Electrolyte/Negative (PEN) Structure

Liu, Wenning N; Sun, Xin; Khaleel, Mohammad A; Qu, Jianmin

Title: Global Failure Criteria for SOFC Positive/Electrolyte/Negative (PEN) Structure

Full Record
Other Related Research

Abstract

Due to the mismatch of thermal expansion coefficients (TEC) of the various layer materials in SOFC, the internal stresses are unavoidable under temperature differential. In order to create the reliable cell and stack of solid oxide fuel cell (SOFC), it is necessary to develop a failure criterion for SOFC PEN structures for the initial failures occurred during cell/stack assembly. In this paper, a global failure criterion is developed for the initial design against mechanical failure of the PEN structure in high temperature SOFCs. The relationship of the critical energy release rate and critical curvature and maximum displacement of the warpage of the cells caused by the temperature differential is established so that the failure reliability of SOFC PEN structures may be determined by the measurement of the curvature and displacement of the warpaged cells.

Authors:: Liu, Wenning N; Sun, Xin; Khaleel, Mohammad A; Qu, Jianmin

Publication Date:: Sun Apr 01 00:00:00 EDT 2007

Research Org.:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 947497

Report Number(s):: PNNL-SA-52082
AA2530000; TRN: US200909%%231

DOE Contract Number:: AC05-76RL01830

Resource Type:: Conference

Resource Relation:: Conference: Society of Automotive Engineers World Congress and Exhibition, 2007-01-0997

Country of Publication:: United States

Language:: English

Subject:: 30 DIRECT ENERGY CONVERSION; DESIGN; RELIABILITY; SOLID OXIDE FUEL CELLS; STRESSES; THERMAL EXPANSION; failure criterion, strain energy release rate, crack, critical curvature

Citation Formats


                    Liu, Wenning N, Sun, Xin, Khaleel, Mohammad A, and Qu, Jianmin. Global Failure Criteria for SOFC Positive/Electrolyte/Negative (PEN) Structure.  United States: N. p., 2007. 
        Web.

Copy to clipboard


                    Liu, Wenning N, Sun, Xin, Khaleel, Mohammad A, & Qu, Jianmin. Global Failure Criteria for SOFC Positive/Electrolyte/Negative (PEN) Structure.  United States.

Copy to clipboard


                    Liu, Wenning N, Sun, Xin, Khaleel, Mohammad A, and Qu, Jianmin. 2007.  
        "Global Failure Criteria for SOFC Positive/Electrolyte/Negative (PEN) Structure".  United States.

Copy to clipboard


                    
@article{osti_947497,

  title        = {Global Failure Criteria for SOFC Positive/Electrolyte/Negative (PEN) Structure},

  author       = {Liu, Wenning N and Sun, Xin and Khaleel, Mohammad A and Qu, Jianmin},

  abstractNote = {Due to the mismatch of thermal expansion coefficients (TEC) of the various layer materials in SOFC, the internal stresses are unavoidable under temperature differential. In order to create the reliable cell and stack of solid oxide fuel cell (SOFC), it is necessary to develop a failure criterion for SOFC PEN structures for the initial failures occurred during cell/stack assembly. In this paper, a global failure criterion is developed for the initial design against mechanical failure of the PEN structure in high temperature SOFCs. The relationship of the critical energy release rate and critical curvature and maximum displacement of the warpage of the cells caused by the temperature differential is established so that the failure reliability of SOFC PEN structures may be determined by the measurement of the curvature and displacement of the warpaged cells.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/947497},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Sun Apr 01 00:00:00 EDT 2007},

  month        = {Sun Apr 01 00:00:00 EDT 2007}

}

Copy to clipboard

Conference:

Other availability

Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Global Failure Criteria for Positive/Electrolyte/Negative Structure of Planar Solid Oxide Fuel Cell

Journal Article Liu, Wenning; Sun, Xin; Khaleel, Mohammad; ... - Journal of Power Sources, 192(2):486-493

Due to mismatch of the coefficients of thermal expansion of various layers in the positive/electrolyte/negative (PEN) 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 duringmore »« less
https://doi.org/10.1016/j.jpowsour.2009.03.012
FRACTURE FAILURE CRITERIA OF SOFC PEN STRUCTURE

Conference Liu, Wenning; Sun, Xin; Khaleel, Mohammad; ...

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/assemblingmore »« less
EFFECT OF SURFACE CONDITION ON SPALLATION BEHAVIOR OF OXIDE SCALE ON SS 441 SUBSTRATE USED IN SOFC

Conference Liu, Wenning; Sun, Xin; Stephens, Elizabeth; ...

As operating temperature of SOFC decreases, ferritic stainless steel has attracted a great deal of attention for its use as an interconnect in SOFCs because of its gas-tightness, low electrical resistivity, ease of fabrication, and cost-effectiveness. However, oxidation reaction of the metallic interconnects in a typical SOFC working environment is unavoidable. The growth stresses in the oxide scale and on the scale/substrate interface combined with the thermal stresses induced by thermal expansion coefficient mismatch between the oxide scale and the substrate may lead to scale delamination/buckling and eventual spallation during stack cooling, which can lead to serious cell performance degradation.more »« less
https://doi.org/10.1002/9781118144527.ch9
Considerations of Glass Sealing SOFC Stacks

Conference Yang, Z; Weil, K; Meinhardt, Kerry; ...

Due to their TEC matching to PEN components, excellent oxidation resistance, low cost and good fabricability, stainless steels have been used as the interconnect materials in planar SOFC. For being hermetical, the stainless steel interconnect ought to be sealed to YSZ electrolyte and/or another piece of metallic interconnect, usually using a sealing glass. The seal performance, which is critical factor to determine the reliability and durability of SOFC stack, largely depends on the chemical compatibility between the sealing glass and stainless steel. In this work, the ferritic stainless steel 446 and a barium-aluminosilicate base glass have been taken as anmore »« less
Prediction of crack propagation paths in the unit cell of SOFC stacks

Journal Article Joulaee, N; Makradi, A; Ahzi, Said; ... - International Journal of Mechanics and Materials in Design, 5(3):217-230

Planar Solid Oxide Fuel Cells (SOFC) stacks are multi-material layered systems with different thermo-mechanical properties. Due to their severe thermal loading, these layers have to meet high demands to preserve their mechanical integrity without initiation and propagation of fracture. Here, we focus on a typical unit cell of the stack which consists of positive electrode-electrolyte-negative electrode (PEN). Based on the mechanical properties of each layer and their interfaces, an energy criterion as a function of crack length is used for the prediction of possible crack extensions in the PEN. This criterion is a pure local criterion, independent of applied loadsmore »« less
https://doi.org/10.1007/s10999-009-9095-5

Similar Records