Multi-scale Mechanical Property Characterisation of Quasi-brittle Filter Graphite

D Liu, Peter J Heard, Peter E J Flewitt, David J Smith

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

1 Citation (Scopus)


In this paper PG25 filter graphite is characterised using mechanical tests conducted over a range of specimen length-scales from the centimetre (three-point bending and Brazilian disc compression) to the micrometre (micro-scale cantilever bending in a FEI Helios dualbeam work station). However, high resolution 3D tomography has revealed that apart from the known
millimetre range of pores, the matrix contains a large population of micro-scale porosity. This leads to two discrete distributions of pore sizes in this material, so that a reduction in mechanical test specimen size results in sampling different proportions of the milli- and micro-scale pores. As a consequence, the measured mechanical properties such as elastic modulus, tensile strength and
flexural strength change as a function of specimen size. This paper explores the potential benefits, difficulties and value of small-scale mechanical tests for this particular application.
Original languageEnglish
Pages (from-to)53-56
Number of pages4
JournalKey Engineering Materials
Publication statusPublished - 2015


  • Porous graphite
  • multi-scale tests
  • micro-cantilever bending
  • quasi-brittle


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