Imperial College London

Professor Nigel Brandon OBE FREng

Faculty of Engineering

Dean of the Faculty of Engineering
 
 
 
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Contact

 

+44 (0)20 7594 8600n.brandon Website

 
 
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Location

 

2.06Faculty BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Wang:2018:10.1002/fuce.201700128,
author = {Wang, X and Chen, Z and Atkinson, A and Brandon, N},
doi = {10.1002/fuce.201700128},
journal = {Fuel Cells},
pages = {42--50},
title = {Numerical study of solid oxide fuel cell contacting mechanics},
url = {http://dx.doi.org/10.1002/fuce.201700128},
volume = {18},
year = {2018}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Assembly of a planar solid oxide fuel cell (SOFC) or solid electrolyzer (SOE) stack involves the lamination of cells and interconnect plates under an applied load. In most designs a pattern of ribs on the interconnector makes contact with a porous ceramic current collector layer on the air side. These localized contacts are regions of increased stress on the cells and can cause damage if the stresses become too large. In this paper the mechanical response of an anode-supported cell to localized loads from interconnector ribs is simulated. The simulations show that the critical stress for initiating and propagating a crack in the electrolyte (∼300MPa for a 10 μm thick electrolyte) is reached when the interconnector displacement reaches 20 μm (after touching the cathode) with reduced support, or 30 μm when in an oxidized state. The difference is due to the lower stiffness of the reduced support. The residual compressive stress in the electrolyte layer has a major protective effect for the electrolyte. It is concluded that fracture is very unlikely for a geometrically perfect contact, but if the contact is non-uniform due to manufacturing variability in the contact plate or cell, local displacements >∼20 μm can be dangerous. The simulations are used in an example of contacting geometry optimization.
AU - Wang,X
AU - Chen,Z
AU - Atkinson,A
AU - Brandon,N
DO - 10.1002/fuce.201700128
EP - 50
PY - 2018///
SN - 1615-6846
SP - 42
TI - Numerical study of solid oxide fuel cell contacting mechanics
T2 - Fuel Cells
UR - http://dx.doi.org/10.1002/fuce.201700128
UR - http://hdl.handle.net/10044/1/55418
VL - 18
ER -