Experimentally informed multi-scale modelling of mechanical properties of quasi-brittle nuclear graphite

Branko Šavija, Dong Liu, Gillian E Smith, Keith R Hallam, Erik Schlangen, Peter Flewitt

Research output: Contribution to journalArticle (Academic Journal)peer-review

41 Citations (Scopus)

Abstract

Nuclear graphite has a complex microstructure and displays quasi-brittle fracture characteristics. Multi-scale experimental characterisation (micrometre-scale to centimetre-scale) and numerical modelling were performed for (i) PG25 filter graphite with pores only (52 vol.%); and (ii) Gilsocarbon nuclear graphite with pores and aggregates. Modelling results show that the average mechanical properties and the scatter of the data both decrease monotonically with increase in specimen size. Strain fields and crack patterns were modelled and fit with experimental observations. The benefits of the model as a valuable tool in studying the influence of microstructural parameters on the fracture of nuclear graphites are discussed.
Original languageEnglish
Pages (from-to)360-377
Number of pages18
JournalEngineering Fracture Mechanics
Volume153
Early online date29 Dec 2015
DOIs
Publication statusPublished - 1 Mar 2016

Keywords

  • Nuclear graphite
  • Quasi-brittle fracture
  • Micro-cantilever testing
  • Multi-scale modelling

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