Finite element analysis of thermal stress distribution in planar SOFC

Chih Kuang Lin, Tsung Ting Chen, An Shin Chen, Yau Pin Chyou, Lieh Kwang Chiang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

A 3-D finite element analysis (FEA) model of a 3-cell stack based on a prototype planar SOFC stack design was constructed to perform thermal stress analyses at shutdown and steady operation conditions. The constructed 3-D FEA model consists of complete planar SOFC components such as positive electrode-electrolyte-negative electrode (PEN) assembly, interconnect, nickel mesh, and gas-tight glass-ceramic seal. The thermal stress distributions at shutdown and steady-state stages as well as their dependence on the initial stress-free temperature and operation cycles were systematically evaluated. Modeling results indicated that the glass-ceramic sealant was the most critical part needed to be watched in terms of structural integrity, in particular at operation temperature where shear fracture of such a component was predicted. Localized plastic deformation was predicted for the metallic interconnect and frame at both shutdown and steady-state conditions. An increase in the initial stress-free temperature would significantly increase the thermal stresses in all of the components at both shutdown and steady-state stages. In addition, a notable increase of thermal stress with increasing cycle number in the PEN at steady-state stage as well as in the glass-ceramic sealant at shutdown stage was predicted.

Original languageEnglish
Title of host publicationECS Transactions - 10th International Symposium on Solid Oxide Fuel Cells, SOFC-X
Pages1977-1986
Number of pages10
Edition1 PART 2
DOIs
StatePublished - 2007
Event10th International Symposium on Solid Oxide Fuel Cells, SOFC-X - , Japan
Duration: 3 Jun 20078 Jun 2007

Publication series

NameECS Transactions
Number1 PART 2
Volume7
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Conference

Conference10th International Symposium on Solid Oxide Fuel Cells, SOFC-X
Country/TerritoryJapan
Period3/06/078/06/07

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