In situ measurement of the strains within a mechanically loaded polygranular graphite

James Marrow, Dong Liu, S M barhli, mora Saucedo, Collins, d m, yelana Vertyagina,, Peter E J Flewitt, David J Smith

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

36 Citations (Scopus)
374 Downloads (Pure)

Abstract

Neutron diffraction and synchrotron X-ray diffraction and imaging have been applied to study, in situ, the mechanical response to tensile and bending loading of polygranular Gilsocarbon nuclear grade nearisotropic graphite (grade IM1-24). Digital image correlation of X-ray radiographs and digital volume correlation of tomographs allow measurement of bulk elastic moduli and examination of the heterogeneity of deformation in the microstructure. Both the neutron and X-ray studies show the application of tensile strain reduces the bulk elastic modulus. A permanent set is observed to develop with applied tensile strain. The elastic strains within the graphite crystals were measured by diffraction; a crosscorrelation analysis method has been applied for greater speed, robustness and improved precision in the measurement of the change in basal plane separation distance. In compression, a linear relation is observed between the elastic strains in the graphite crystals and the applied strain. In tension, this relationship is non-linear. The results are discussed with respect to the distribution of elastic and inelastic strain within the graphite microstructure. It is deduced that the significant residual elastic strains in the as-manufactured graphite are relaxed by microcracicing as tensile strain is applied. (C) 2015 The Authors. Published by Elsevier Ltd.
Original languageEnglish
Pages (from-to)285-302
Number of pages8
JournalCarbon
Volume96
Issue number1
Early online date18 Sep 2015
DOIs
Publication statusPublished - 1 Jan 2016

Keywords

  • graphite
  • strain
  • diffraction
  • mechanical deformation

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