Synchrotron X-ray characterization of crack strain fields in polygranular graphite

S. M. Barhli*, L. Saucedo-Mora, M. S.L. Jordan, A. F. Cinar, C. Reinhard, M. Mostafavi, T. J. Marrow

*Corresponding author for this work

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

24 Citations (Scopus)
369 Downloads (Pure)

Abstract

The strain field of a crack in polygranular isotropic nuclear graphite, a quasi-brittle material, has been studied during stable fracture propagation. Synchrotron X-ray computed tomography and strain mapping by diffraction were combined with digital volume correlation and phase congruency image analysis to extract the full field displacements and elastic crystal strains. The measured displacement fields have been analysed using a Finite Element method to extract the elastic strain energy release rate as a J-integral. Non-linear properties described the effect of microcracking on the elastic modulus in the fracture process zone. The analysis was verified by the good agreement of the predicted and measured elastic strain fields when using the non-linear model. The intrinsic critical elastic strain energy release rate for mode I crack propagation is approximately 200 J m−2.

Original languageEnglish
Pages (from-to)357-371
Number of pages15
JournalCarbon
Volume124
Early online date3 Sep 2017
DOIs
Publication statusPublished - 1 Nov 2017

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