Spherical indentation of bilayer ceramic structures: dense layer on porous substrate

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Title: Spherical indentation of bilayer ceramic structures: dense layer on porous substrate
Authors: Chen, Z
Wang, X
Brandon, N
Atkinson, A
Item Type: Journal Article
Abstract: 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.
Issue Date: 4-Jun-2017
Date of Acceptance: 27-May-2017
URI: http://hdl.handle.net/10044/1/48809
DOI: https://dx.doi.org/10.1016/j.jeurceramsoc.2017.05.053
ISSN: 1873-619X
Publisher: Elsevier
Start Page: 4763
End Page: 4772
Journal / Book Title: Journal of the European Ceramic Society
Volume: 37
Issue: 15
Copyright Statement: © 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license(http://creativecommons.org/licenses/by/4.0/).
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/J016454/1
Keywords: 0912 Materials Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Faculty of Natural Sciences

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