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{Chen:2017:10.1016/j.jeurceramsoc.2017.05.053,
author = {Chen, Z and Wang, X and Brandon, N and Atkinson, A and Wang, X and Atkinson, A and Brandon, N and Chen, Z},
doi = {10.1016/j.jeurceramsoc.2017.05.053},
journal = {Journal of the European Ceramic Society},
pages = {4763--4772},
title = {Spherical indentation of bilayer ceramic structures: dense layer on porous substrate},
url = {http://dx.doi.org/10.1016/j.jeurceramsoc.2017.05.053},
volume = {37},
year = {2017}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Spherical indentation of thin 8YSZ ceramic layers on porous substrates (NiO/Ni-8YSZ) was studied. Indentation-induced elastic and plastic deformation and damage of the bilayer was experimentally analysed. FE simulations of the indentation process were carried out using the Gurson model to account for densification of the porous substrates. The simulated load-depth responses were in excellent agreement with the measured ones. The resulting stress distributions showed that the damage to the YSZ initiates in a tensile region near the interface due to bending during loading at a failure stress of ∼2 GPa, which is consistent with pores of ∼1 μm size seen in the YSZ. Delamination occurs on unloading due to the elastic recovery of YSZ being greater than that of the substrates at a de-bonding stress of 120 MPa. Residual compressive stress in the YSZ inhibits crack opening displacements normal to the layer plane which is beneficial for application of these structures in SOFCs.
AU - Chen,Z
AU - Wang,X
AU - Brandon,N
AU - Atkinson,A
AU - Wang,X
AU - Atkinson,A
AU - Brandon,N
AU - Chen,Z
DO - 10.1016/j.jeurceramsoc.2017.05.053
EP - 4772
PY - 2017///
SN - 1873-619X
SP - 4763
TI - Spherical indentation of bilayer ceramic structures: dense layer on porous substrate
T2 - Journal of the European Ceramic Society
UR - http://dx.doi.org/10.1016/j.jeurceramsoc.2017.05.053
UR - http://hdl.handle.net/10044/1/48809
VL - 37
ER -