In-situ neutron diffraction measurement and numerical modelling of macro- and micro-strains in two porous synthetic graphites

S. Nakhodchi*, R. Hayatian, P. E.J. Flewitt

*Corresponding author for this work

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

Abstract

In-situ neutron diffraction measurements have been performed on IMI-24 grade (20% porosity) and PG25 (48% porosity) graphite subjected to external uni-axial compression loading. The ‘pore free’ matrix properties such as modulus of elasticity of about 72 GPa and 46 GPa were measured for the IMI-24 and PG25, respectively, and were higher than those measured at the macro-length-scale. The elastic modulus of each crystal plane, hkl, is reported ranging from about 48–145 GPa and Poisson ratio ranging from 0.08–0.28 for IMI-24 graphite. With the proposed method, the pore morphology factor ‘m’ was independently evaluated to be 10.8 and 4.8 for IMI-24 and PG25, respectively. It has been demonstrated from that the micro-diffraction the Young modulus is not dependent on the pore morphology factor. We consider and discuss the experimental plus modelling approach to provide a new perspective on the micro-mechanics of porous graphites.

Original languageEnglish
Pages (from-to)55-64
Number of pages10
JournalMaterials Science and Technology (United Kingdom)
Volume36
Issue number1
Early online date12 Nov 2019
DOIs
Publication statusPublished - 2 Jan 2020

Keywords

  • macro–micro-strain
  • neutron diffraction
  • Porous graphite

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