eprintid: 10062168
rev_number: 16
eprint_status: archive
userid: 608
dir: disk0/10/06/21/68
datestamp: 2018-11-26 15:12:37
lastmod: 2021-11-27 00:09:04
status_changed: 2018-11-26 15:12:37
type: article
metadata_visibility: show
creators_name: Naderi, S
creators_name: Heath, JP
creators_name: Dean, JS
title: Morphology characterisation of inclusions to predict the breakdown strength in electro-ceramic materials: Microstructure modelling
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F44
keywords: Electroceramics, Microstructure, Modelling, Porosity
note: © 2018 The Authors. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/BY/4.0/).
abstract: Microstructural features such as pores, secondary phases and inclusions can significantly alter the electrical response of ceramics. Here we present a morphological finite element approach to better understand the effect of such microstructural defects on the behaviour of electroceramics. We generate irregular three-dimensional geometric models with realistic features and controllable parameters providing a method of characterising their morphology using sphericity, signifying irregularity, and projected area. The inclusion models are solved for their electrical response for changes in the material properties, making the feature either insulating or conductive in relation to the surrounding material. The electric field distribution analysis indicates the irregularity has a significant effect on the electric response, increasing the field concentration up to 12 times more than the applied field. Plotting the electric field distribution using a Weibull cumulative Probability Distribution Function we have also estimated the breakdown strength of the material. This shows that a material's breakdown strength can be reduced to 55% for an 87.5% dense sample if the inclusion is insulative and has a low sphericity or high projected area. This can be further reduced to only 40% if the feature is more conductive than the ceramic.
date: 2019-01
date_type: published
official_url: https://doi.org/10.1016/j.ceramint.2018.09.175
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
article_type_text: Article
verified: verified_manual
elements_id: 1601346
doi: 10.1016/j.ceramint.2018.09.175
lyricists_name: Naderi, Sadjad
lyricists_id: SSNAD54
actors_name: Bracey, Alan
actors_id: ABBRA90
actors_role: owner
full_text_status: public
publication: Ceramics International
volume: 45
number: 1
pagerange: 361-368
issn: 0272-8842
citation:        Naderi, S;    Heath, JP;    Dean, JS;      (2019)    Morphology characterisation of inclusions to predict the breakdown strength in electro-ceramic materials: Microstructure modelling.                   Ceramics International , 45  (1)   pp. 361-368.    10.1016/j.ceramint.2018.09.175 <https://doi.org/10.1016/j.ceramint.2018.09.175>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10062168/1/1-s2.0-S0272884218326440-main.pdf