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Dr Luis Saucedo Mora and Prof. James Marrow were supported by the UK Engineering and Physical Science Research Council (EPSRC) under grant EP/J01992/1 (QUBE: QUasi-Brittle fracture: a 3D Experimentally-validated approach). Prof. James Marrowand Dr Mahmoud Mostafavi also gratefully acknowledge the support of the Oxford Martin School (Nuclear Programme). Birmingham University (Prof. Brian Connolly) is thanked for the loan of the loading rig, which was provided via EPSRC Grant (EP/H025286/1: Long Term, In Situ Material Degradation Studies Utilizing High Resolution Laboratory X-ray Tomography). The Diamond Light Source synchrotron is acknowledged for the award of beam time under experiment EE9478. The support of Mr Matthew Jordan by EDF Energy Generation, that also provided the material, is gratefully acknowledged (EPSRC Industrial CASE studentship 11220486). Mr Selim Barhli was supported by Department of Materials Engineering and Physical Sciences Research Council (EPSRC) Doctoral Training Account (studentship 1382829); he and Mr Ahmet Cinar acknowledge their support by LaVision Gbmh. The authors thank Mr Henry Lawrence (Magdelen College School) for performing the manual crack measurements from X-ray tomographs, and Dr Fabien Leonard (University of Manchester) and Mr Chung-Roung Zou (National University of Defense Technology, PR China) for their assistance with data collection at the Diamond Light Source. Data may be obtained from the corresponding author.

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

Publicado en:Carbon. 124 357-371 - 2017-11-01 124(), DOI: https://doi.org/10.1016/j.carbon.2017.08.075

Autores: Barhli, SM; Saucedo-Mora, L; Jordan, MSL; Cinar, AF; Reinhard, C; Mostafavi, M; Marrow, TJ

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Resumen

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). (C) 2017 Elsevier Ltd. All rights reserved.

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