Simulation and validation of thermo-mechanical stresses in planar SOFCs

Kuebler, Jakob; Vogt, Uli F.; Haberstock, D.; Sfeir, J.; Mai, Andreas; Hocker, Thomas; Roos, Markus; Harnisch, Urs

doi:10.1002/fuce.201000040

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Simulation and validation of thermo-mechanical stresses in planar SOFCs
Authors:	Kuebler, Jakob Vogt, Uli F. Haberstock, D. Sfeir, J. Mai, Andreas Hocker, Thomas Roos, Markus Harnisch, Urs
DOI:	10.1002/fuce.201000040
Published in:	Fuel Cells
Volume(Issue):	10
Issue:	6
Page(s):	1066
Pages to:	1073
Issue Date:	1-Oct-2010
Publisher / Ed. Institution:	Wiley
ISSN:	1615-6846 1615-6854
Language:	English
Subjects:	Fuel cell; Thermo-mechanical stress; Failure mechanism; SOFC
Subject (DDC):	530: Physics 621.3: Electrical, communications, control engineering
Abstract:	To study possible failure modes of the Hexis Galileo solid oxide fuel cell stack, various stack components such as nickel/yttria stabilised zirconia anodes, lanthanum strontium manganese cathodes, 3 mol%-yttria stabilised zirconia electrolytes and chromium alloy metallic interconnectors have been characterised with respect to their thermo-mechanical properties. Specifically, coefficients of thermal expansion, Young's moduli, bending strengths, Poisson's ratios and fracture toughnesses have been measured. Furthermore, the temperature-dependent warpage of complete cells has been investigated by video analysis. All experimental data were taken as input parameters for a set of finite element models to analyse various thermo-mechanical phenomena on different length scales. The simulations offer an explanation for the often observed ´saddle-like´ deformations of cells at room temperature. They also show that cracks that first develop within the anode induce local tensile stresses within the electrolyte and hence represent a weakening mechanism for the cells. It is shown that the induced electrolyte stresses depend on the anode crack density. The electrolyte stresses decrease as the distances between the anode cracks become smaller.
URI:	https://digitalcollection.zhaw.ch/handle/11475/1638
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Organisational Unit:	Institute of Computational Physics (ICP)
Appears in collections:	Publikationen School of Engineering

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Kuebler, J., Vogt, U. F., Haberstock, D., Sfeir, J., Mai, A., Hocker, T., Roos, M., & Harnisch, U. (2010). Simulation and validation of thermo-mechanical stresses in planar SOFCs. Fuel Cells, 10(6), 1066–1073. https://doi.org/10.1002/fuce.201000040

Kuebler, J. et al. (2010) ‘Simulation and validation of thermo-mechanical stresses in planar SOFCs’, Fuel Cells, 10(6), pp. 1066–1073. Available at: https://doi.org/10.1002/fuce.201000040.

J. Kuebler et al., “Simulation and validation of thermo-mechanical stresses in planar SOFCs,” Fuel Cells, vol. 10, no. 6, pp. 1066–1073, Oct. 2010, doi: 10.1002/fuce.201000040.

KUEBLER, Jakob, Uli F. VOGT, D. HABERSTOCK, J. SFEIR, Andreas MAI, Thomas HOCKER, Markus ROOS und Urs HARNISCH, 2010. Simulation and validation of thermo-mechanical stresses in planar SOFCs. Fuel Cells. 1 Oktober 2010. Bd. 10, Nr. 6, S. 1066–1073. DOI 10.1002/fuce.201000040

Kuebler, Jakob, Uli F. Vogt, D. Haberstock, J. Sfeir, Andreas Mai, Thomas Hocker, Markus Roos, and Urs Harnisch. 2010. “Simulation and Validation of Thermo-Mechanical Stresses in Planar SOFCs.” Fuel Cells 10 (6): 1066–73. https://doi.org/10.1002/fuce.201000040.

Kuebler, Jakob, et al. “Simulation and Validation of Thermo-Mechanical Stresses in Planar SOFCs.” Fuel Cells, vol. 10, no. 6, Oct. 2010, pp. 1066–73, https://doi.org/10.1002/fuce.201000040.