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

T. J. Marrow, D. Liu, S. M. Barhli, L. Saucedo Mora, Ye Vertyagina, D. M. Collins, C. Reinhard, S. Kabra, P. E.J. Flewitt, D. J. Smith

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

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 near-isotropic 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 cross-correlation 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 microcracking as tensile strain is applied.

Original languageEnglish
Pages (from-to)285-302
Number of pages18
JournalCarbon
Volume96
Early online date18 Sep 2015
DOIs
Publication statusPublished - 1 Jan 2016

ASJC Scopus subject areas

  • Chemistry(all)

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