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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 language | English |
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Pages (from-to) | 285-302 |
Number of pages | 8 |
Journal | Carbon |
Volume | 96 |
Issue number | 1 |
Early online date | 18 Sept 2015 |
DOIs | |
Publication status | Published - 1 Jan 2016 |
Keywords
- graphite
- strain
- diffraction
- mechanical deformation
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Dive into the research topics of 'In situ measurement of the strains within a mechanically loaded polygranular graphite'. Together they form a unique fingerprint.Projects
- 1 Finished
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QUBE:- QUasi-Brittle fracture: a 3D Experimentally-validated approach
Flewitt, P. E. J. (Principal Investigator)
1/10/12 → 1/04/16
Project: Research