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RESEARCH PAPER

Comparison of Methodologies for Determination of Fracture Strength of 8mol% Yttria-Stabilized Zirconia Electrolyte Materials

[+] Author and Article Information
Ke An

 Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831kean@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, Marshall H. McCord

 Department of Engineering Science and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061

J. Fuel Cell Sci. Technol 2(2), 99-103 (Dec 10, 2004) (5 pages) doi:10.1115/1.1867974 History: Received April 11, 2004; Revised December 10, 2004

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 8mol% YSZ electrolytes as 100×100mm squire plates, 23mm disks, and 17mm 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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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 7

Weibull plot of the electrolyte plates determined from the plate tensile test

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Figure 8

Weibull plot for 23mm electrolyte disks determined from the ball-on-ring test

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Figure 9

Weibull plot for 17mm electrolyte disks determined from the pressure-on-ring test

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Figure 6

Principal stress and out-of-plane displacement distribution of the pressure-on-ring test

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Figure 5

Load-displacement curves of the pressure-on-ring tests with all experimental data

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Figure 4

Validation of FEA simulation of pressure-on-ring test for 17mm disk samples

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Figure 3

Principal stress and out-of-plane displacement distribution of the ball-on-ring test

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Figure 2

Comparison of peak stress of the ball-on-ring test as determined by FEA and ASTM F394

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Figure 1

Close view of the pressure-on-ring tester: (1) O rings, (2) Oil chamber, (3) LVDT tip, and (4) support steel ring

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