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Steady state and transient thermal stress analysis in planar solid oxide fuel cells

Selimovic, Azra LU ; Kemm, Miriam LU ; Torisson, Tord LU and Assadi, Mohsen LU (2005) In Journal of Power Sources 145(2). p.463-469
Abstract
Resulting from elevated temperatures the major structural problem foreseen with planar SOFCs is their thermal stress. Due to the brittle nature of ceramic material, operation in or near the material plastic limit can be very critical. Therefore stress levels must always be kept below the tensile and shear limits. The analysis is focused on determination of the stress caused by the difference in thermal expansion coefficients when high temperature gradients occur in the SOFC layers during steady state and transient operation (heat-up, start-up and shut-down). Utilizing an in-house developed tool for assessment of the electrochemical and thermal performance of a bipolar planar cell the input temperature profiles are generated for a finite... (More)
Resulting from elevated temperatures the major structural problem foreseen with planar SOFCs is their thermal stress. Due to the brittle nature of ceramic material, operation in or near the material plastic limit can be very critical. Therefore stress levels must always be kept below the tensile and shear limits. The analysis is focused on determination of the stress caused by the difference in thermal expansion coefficients when high temperature gradients occur in the SOFC layers during steady state and transient operation (heat-up, start-up and shut-down). Utilizing an in-house developed tool for assessment of the electrochemical and thermal performance of a bipolar planar cell the input temperature profiles are generated for a finite element analysis code to predict thermal component of the stress. The failure criterion adopted is based on the strength of the cell materials and the principal stresses developed by the thermal loading. To visualize the stress concentration in the fuel cell layers, maximum principal stress is calculated and compared with the yield strength of the SOFC materials found in the literature. The in-house code is capable to predict both steady state and dynamic temperature profiles. Of particular importance is the knowledge gained of the transient stress in the cell, which can be used to establish control parameters during transient operations. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
thermal stress, solid oxide fuel cell, fuel cell modelling, transient, analysis
in
Journal of Power Sources
volume
145
issue
2
pages
463 - 469
publisher
Elsevier
external identifiers
  • wos:000231893300047
  • scopus:23844444297
ISSN
1873-2755
DOI
10.1016/j.jpowsour.2004.11.073
language
English
LU publication?
yes
id
ba061508-3e2c-44e1-bf19-be3a2642a94a (old id 224000)
date added to LUP
2007-10-05 14:18:31
date last changed
2017-10-01 03:36:00
@article{ba061508-3e2c-44e1-bf19-be3a2642a94a,
  abstract     = {Resulting from elevated temperatures the major structural problem foreseen with planar SOFCs is their thermal stress. Due to the brittle nature of ceramic material, operation in or near the material plastic limit can be very critical. Therefore stress levels must always be kept below the tensile and shear limits. The analysis is focused on determination of the stress caused by the difference in thermal expansion coefficients when high temperature gradients occur in the SOFC layers during steady state and transient operation (heat-up, start-up and shut-down). Utilizing an in-house developed tool for assessment of the electrochemical and thermal performance of a bipolar planar cell the input temperature profiles are generated for a finite element analysis code to predict thermal component of the stress. The failure criterion adopted is based on the strength of the cell materials and the principal stresses developed by the thermal loading. To visualize the stress concentration in the fuel cell layers, maximum principal stress is calculated and compared with the yield strength of the SOFC materials found in the literature. The in-house code is capable to predict both steady state and dynamic temperature profiles. Of particular importance is the knowledge gained of the transient stress in the cell, which can be used to establish control parameters during transient operations.},
  author       = {Selimovic, Azra and Kemm, Miriam and Torisson, Tord and Assadi, Mohsen},
  issn         = {1873-2755},
  keyword      = {thermal stress,solid oxide fuel cell,fuel cell modelling,transient,analysis},
  language     = {eng},
  number       = {2},
  pages        = {463--469},
  publisher    = {Elsevier},
  series       = {Journal of Power Sources},
  title        = {Steady state and transient thermal stress analysis in planar solid oxide fuel cells},
  url          = {http://dx.doi.org/10.1016/j.jpowsour.2004.11.073},
  volume       = {145},
  year         = {2005},
}