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