Failure analysis of the effects of porosity in thermally oxidised nuclear graphite using finite element modelling

C. Berre; S. L. Fok; P. M. Mummery; J. Ali; B. J. Marsden; T. J. Marrow; G. B. Neighbour

doi:10.1016/j.jnucmat.2008.07.021

Failure analysis of the effects of porosity in thermally oxidised nuclear graphite using finite element modelling

C. Berre, S. L. Fok, P. M. Mummery, J. Ali, B. J. Marsden, T. J. Marrow, G. B. Neighbour

Restorative Sciences

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Abstract

Finite element models of thermally oxidised nuclear graphite were generated using three-dimensional high-resolution tomography images. Bulk tensile strength was then evaluated using a smeared-crack model, which shows an exponential decay in the bulk strength with increasing pore volume. The finite element results were in good agreement with radiolytic oxidation experiments. A stochastic analysis using a modified Weibull theory was also performed to describe the evolution of the failure process with increasing load for different levels of porosities.

Original language	English (US)
Pages (from-to)	1-8
Number of pages	8
Journal	Journal of Nuclear Materials
Volume	381
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jnucmat.2008.07.021
State	Published - Oct 31 2008

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Funding Information:
The financial support of British Energy Generation Ltd. is gratefully acknowledged. The views expressed in this publication are those of the authors and do not necessarily represent the views of the sponsor.

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10.1016/j.jnucmat.2008.07.021

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title = "Failure analysis of the effects of porosity in thermally oxidised nuclear graphite using finite element modelling",

abstract = "Finite element models of thermally oxidised nuclear graphite were generated using three-dimensional high-resolution tomography images. Bulk tensile strength was then evaluated using a smeared-crack model, which shows an exponential decay in the bulk strength with increasing pore volume. The finite element results were in good agreement with radiolytic oxidation experiments. A stochastic analysis using a modified Weibull theory was also performed to describe the evolution of the failure process with increasing load for different levels of porosities.",

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note = "Funding Information: The financial support of British Energy Generation Ltd. is gratefully acknowledged. The views expressed in this publication are those of the authors and do not necessarily represent the views of the sponsor. ",

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AU - Fok, S. L.

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AU - Ali, J.

AU - Marsden, B. J.

AU - Marrow, T. J.

AU - Neighbour, G. B.

N1 - Funding Information: The financial support of British Energy Generation Ltd. is gratefully acknowledged. The views expressed in this publication are those of the authors and do not necessarily represent the views of the sponsor.

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N2 - Finite element models of thermally oxidised nuclear graphite were generated using three-dimensional high-resolution tomography images. Bulk tensile strength was then evaluated using a smeared-crack model, which shows an exponential decay in the bulk strength with increasing pore volume. The finite element results were in good agreement with radiolytic oxidation experiments. A stochastic analysis using a modified Weibull theory was also performed to describe the evolution of the failure process with increasing load for different levels of porosities.

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Failure analysis of the effects of porosity in thermally oxidised nuclear graphite using finite element modelling

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