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  4. Sensitivity of Stresses and Failure Mechanisms in SOFCs to the Mechanical Properties and Geometry of the Constitutive Layers
 
conference paper

Sensitivity of Stresses and Failure Mechanisms in SOFCs to the Mechanical Properties and Geometry of the Constitutive Layers

Nakajo, Arata  
•
Van herle, Jan  
•
Favrat, Daniel  
2011
Fuel Cells
7th Symposium on Fuel Cell Modelling and Experimental Validation (MODVAL7)

A model based on the Euler-Bernoulli theory is used to assess the sensitivity of residual stresses in solid oxide fuel cells to the mechanical properties and geometry of the constituents. It considers different cell configurations, characterised by the presence or not of a compensating layer, and a cathode based on either lanthanum strontium manganite (LSM) or lanthanum strontium cobaltite ferrite (LSCF). The implementation of creep in the model provides insights into the parameters that affect the zero-stress temperature and behaviour during ageing. The amount of irreversible deformation generated in the cell layers after the sintering step depends on the mechanical properties of the layers, type of cell and to some extent, cooling rate. X-ray diffraction measurements from literature are used to verify the prediction. Depending on the mechanical properties, the stress state in the LSM cathode changes from tensile to compressive with respect to temperature. During combined ageing and thermal cycling, tensile stress might arise in the compatibility layer of LSCF-based cells, due to the relief of the initial compressive stress at operating temperature. The Weibull analysis provides the assessment of mechanical failure. A simplified approach is used for buckling-driven delamination, but the propagation of cracks is predicted for unlikely large preexisting defects.

  • Details
  • Metrics
Type
conference paper
DOI
10.1002/fuce.201000108
Web of Science ID

WOS:000294177000008

Author(s)
Nakajo, Arata  
Van herle, Jan  
Favrat, Daniel  
Date Issued

2011

Publisher

Wiley

Published in
Fuel Cells
Volume

11

Start page

537

End page

552

Subjects

Creep

•

Delamination

•

Mechanical Degradation

•

Residual Stress

•

Solid Oxide Fuel Cell

•

Oxide Fuel-Cells

•

Yttria-Stabilized Zirconia

•

Steam-Reforming Catalysts

•

Ferrite-Based Perovskites

•

Thermal Barrier Coatings

•

Anode-Supported Sofcs

•

Residual-Stresses

•

Cathode Materials

•

Fracture Energy

•

Porous Cermets

Editorial or Peer reviewed

NON-REVIEWED

Written at

EPFL

EPFL units
LENI  
Event nameEvent placeEvent date
7th Symposium on Fuel Cell Modelling and Experimental Validation (MODVAL7)

Morges, Switzerland

Mar 23-24, 2010

Available on Infoscience
December 16, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/73671
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