Analysis of spherical indentation of porous ceramic films

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Title: Analysis of spherical indentation of porous ceramic films
Authors: Chen, Z
Wang, X
Brandon, N
Atkinson, A
Item Type: Journal Article
Abstract: Spherical indentation of a porous brittle La0.6Sr0.4Co0.2Fe0.8O3 ceramic film (porosity=39.7%) on a stiffer elastic Ce0.9Gd0.1O1.95 substrate is simulated by finite element modelling incorporating the Gurson model to account for densification. The simulated load-displacement curves, apparent elastic modulus E, indentation hardness H and densification profile are all in good agreement with experimental data for the film. The simulations show that E and H are not sensitive to film residual stress. However E is very sensitive to the indent depth-film thickness ratio f, although H is less so for f<0.3. The simulated dependence of E and H on f are highly consistent with experimental data, supporting the extrapolation of E and H measured for 0.1<f<0.3, to zero depth for good estimates of the film-alone properties. The inclusion of densification in the simulation makes only a small difference to E, but has a large influence on H as a function of indentation depth.
Issue Date: 15-Oct-2016
Date of Acceptance: 3-Oct-2016
URI: http://hdl.handle.net/10044/1/41369
DOI: https://dx.doi.org/10.1016/j.jeurceramsoc.2016.10.002
ISSN: 1873-619X
Publisher: Elsevier
Start Page: 1031
End Page: 1038
Journal / Book Title: Journal of the European Ceramic Society
Volume: 37
Issue: 3
Copyright Statement: © 2016 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 (E
Funder's Grant Number: EP/M014045/1
EP/L019469/1
Keywords: Science & Technology
Technology
Materials Science, Ceramics
Materials Science
Porous ceramic film
Indentation
Finite element modelling
Deformation
Mechanical properties
MECHANICAL-PROPERTIES
NANOINDENTATION
HARDNESS
SUBSTRATE
TOUGHNESS
MODULUS
DEPTH
Materials
0912 Materials Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Materials
Earth Science and Engineering
Faculty of Natural Sciences



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