The widely used yttria-stabilized zirconia (YSZ) electrolyte is subjected to thermal and external stresses under operation, so that the enhancement of the mechanical properties is an important issue in planar solid oxide fuel cells. Fracture strengths of YSZ electrolytes as squire plates, disks, and disks were evaluated using plate tensile, ball-on-ring, and pressure-on-ring testing methodologies, respectively. Finite element analysis (FEA) was validated and used to calculate the stress distribution and peak stress for the biaxial strength tests. A Weibull analysis was carried out on the test∕FEA-predicted peak stresses, and Weibull strength, modulus, and material scale parameters were found for each test methodology. The methodologies were compared and evaluated based on the results of the Weibull analysis; the pressure-on-ring test is preferred for brittle thin-film fracture strength testing.
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e-mail: kean@ut.edu
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May 2005
This article was originally published in
Journal of Fuel Cell Science and Technology
Research Papers
Comparison of Methodologies for Determination of Fracture Strength of Yttria-Stabilized Zirconia Electrolyte Materials
Ke An,
e-mail: kean@ut.edu
Ke An
Metals and Ceramics Division
, Oak Ridge National Laboratory, Oak Ridge, TN 37831
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Howard G. Halverson,
Howard G. Halverson
Department of Civil and Environmental Engineering
, University of Connecticut, Storrs, CT 06269
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Kenneth L. Reifsnider,
Kenneth L. Reifsnider
Connecticut Global Fuel Cell Center
, Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269
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Scott W. Case,
Scott W. Case
Department of Engineering Science and Mechanics
, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
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Marshall H. McCord
Marshall H. McCord
Department of Engineering Science and Mechanics
, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
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Ke An
Metals and Ceramics Division
, Oak Ridge National Laboratory, Oak Ridge, TN 37831e-mail: kean@ut.edu
Howard G. Halverson
Department of Civil and Environmental Engineering
, University of Connecticut, Storrs, CT 06269
Kenneth L. Reifsnider
Connecticut Global Fuel Cell Center
, Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269
Scott W. Case
Department of Engineering Science and Mechanics
, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
Marshall H. McCord
Department of Engineering Science and Mechanics
, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061J. Fuel Cell Sci. Technol. May 2005, 2(2): 99-103 (5 pages)
Published Online: December 10, 2004
Article history
Received:
April 11, 2004
Revised:
December 10, 2004
Citation
An, K., Halverson, H. G., Reifsnider, K. L., Case, S. W., and McCord, M. H. (December 10, 2004). "Comparison of Methodologies for Determination of Fracture Strength of Yttria-Stabilized Zirconia Electrolyte Materials." ASME. J. Fuel Cell Sci. Technol. May 2005; 2(2): 99–103. https://doi.org/10.1115/1.1867974
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