Assessment of the fracture toughness of neutron-irradiated nuclear graphite by 3D analysis of the crack displacement field

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Assessment of the fracture toughness of neutron-irradiated nuclear graphite by 3D analysis of the crack displacement field. / Jin, Xiaochao; Wade-Zhu, James; Chen, Yang; Mummery, Paul M.; Fan, Xueling; Marrow, T. James.

In: Carbon, Vol. 171, 01.2021, p. 882-893.

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Jin, Xiaochao ; Wade-Zhu, James ; Chen, Yang ; Mummery, Paul M. ; Fan, Xueling ; Marrow, T. James. / Assessment of the fracture toughness of neutron-irradiated nuclear graphite by 3D analysis of the crack displacement field. In: Carbon. 2021 ; Vol. 171. pp. 882-893.

Bibtex

@article{7b3a86e2bca34afb96041ec2c98bc103,
title = "Assessment of the fracture toughness of neutron-irradiated nuclear graphite by 3D analysis of the crack displacement field",
abstract = "Digital volume correlation of in situ synchrotron X-ray computed tomographs has been used to measure the three-dimensional displacement fields around quasi-static propagating cracks in neutron irradiated and unirradiated graphite in specimens of the double cleavage drilled compression geometry. The crack tip location and crack opening were extracted from the displacement fields using a phase congruency edge detection method as cracks were propagated over ∼5 mm. The cracks propagated in mode I, maintaining a constant crack opening angle that was ∼50% smaller for the irradiated graphite. 3D finite element simulations, using the measured full field displacements as boundary conditions, obtained the critical elastic strain energy release rate for crack propagation by calculation of the domain contour J-integral. When the non-linear properties of unirradiated graphite were considered, the strain energy release rate for propagation was constant (180 ± 22 Jm-2) with increasing crack length. The irradiated graphite (fluence of 19.7 × 1020 neutrons cm−2 or 2.6 dpa, 4% weight loss by radiolytic oxidation) had linear elastic properties, and the strain energy release rate for propagation increased linearly from 118 ± 12Jm-2 to 485 ± 75 Jm-2 with crack length.",
author = "Xiaochao Jin and James Wade-Zhu and Yang Chen and Mummery, {Paul M.} and Xueling Fan and Marrow, {T. James}",
year = "2021",
month = jan,
doi = "10.1016/j.carbon.2020.09.072",
language = "English",
volume = "171",
pages = "882--893",
journal = "Carbon",
issn = "0008-6223",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Assessment of the fracture toughness of neutron-irradiated nuclear graphite by 3D analysis of the crack displacement field

AU - Jin, Xiaochao

AU - Wade-Zhu, James

AU - Chen, Yang

AU - Mummery, Paul M.

AU - Fan, Xueling

AU - Marrow, T. James

PY - 2021/1

Y1 - 2021/1

N2 - Digital volume correlation of in situ synchrotron X-ray computed tomographs has been used to measure the three-dimensional displacement fields around quasi-static propagating cracks in neutron irradiated and unirradiated graphite in specimens of the double cleavage drilled compression geometry. The crack tip location and crack opening were extracted from the displacement fields using a phase congruency edge detection method as cracks were propagated over ∼5 mm. The cracks propagated in mode I, maintaining a constant crack opening angle that was ∼50% smaller for the irradiated graphite. 3D finite element simulations, using the measured full field displacements as boundary conditions, obtained the critical elastic strain energy release rate for crack propagation by calculation of the domain contour J-integral. When the non-linear properties of unirradiated graphite were considered, the strain energy release rate for propagation was constant (180 ± 22 Jm-2) with increasing crack length. The irradiated graphite (fluence of 19.7 × 1020 neutrons cm−2 or 2.6 dpa, 4% weight loss by radiolytic oxidation) had linear elastic properties, and the strain energy release rate for propagation increased linearly from 118 ± 12Jm-2 to 485 ± 75 Jm-2 with crack length.

AB - Digital volume correlation of in situ synchrotron X-ray computed tomographs has been used to measure the three-dimensional displacement fields around quasi-static propagating cracks in neutron irradiated and unirradiated graphite in specimens of the double cleavage drilled compression geometry. The crack tip location and crack opening were extracted from the displacement fields using a phase congruency edge detection method as cracks were propagated over ∼5 mm. The cracks propagated in mode I, maintaining a constant crack opening angle that was ∼50% smaller for the irradiated graphite. 3D finite element simulations, using the measured full field displacements as boundary conditions, obtained the critical elastic strain energy release rate for crack propagation by calculation of the domain contour J-integral. When the non-linear properties of unirradiated graphite were considered, the strain energy release rate for propagation was constant (180 ± 22 Jm-2) with increasing crack length. The irradiated graphite (fluence of 19.7 × 1020 neutrons cm−2 or 2.6 dpa, 4% weight loss by radiolytic oxidation) had linear elastic properties, and the strain energy release rate for propagation increased linearly from 118 ± 12Jm-2 to 485 ± 75 Jm-2 with crack length.

U2 - 10.1016/j.carbon.2020.09.072

DO - 10.1016/j.carbon.2020.09.072

M3 - Article

VL - 171

SP - 882

EP - 893

JO - Carbon

JF - Carbon

SN - 0008-6223

ER -