A phase-field approach to model multi-axial and microstructure dependent fracture in nuclear grade graphite

Chakraborty, Pritam; Sabharwall, Piyush; Carroll, Mark C.

doi:10.1016/j.jnucmat.2016.04.006

Title: A phase-field approach to model multi-axial and microstructure dependent fracture in nuclear grade graphite

Journal Article · Thu Apr 07 00:00:00 EDT 2016 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2016.04.006· OSTI ID:1357605

^[1]; Sabharwall, Piyush ^[1]; Carroll, Mark C. ^[1]

Idaho National Lab. (INL), Idaho Falls, ID (United States)

The fracture behavior of nuclear grade graphites is strongly influenced by underlying microstructural features such as the character of filler particles, and the distribution of pores and voids. These microstructural features influence the crack nucleation and propagation behavior, resulting in quasi-brittle fracture with a tortuous crack path and significant scatter in measured bulk strength. This paper uses a phase-field method to model the microstructural and multi-axial fracture in H-451, a historic variant of nuclear graphite that provides the basis for an idealized study on a legacy grade. The representative volume elements are constructed from randomly located pores with random size obtained from experimentally determined log-normal distribution. The representative volume elements are then subjected to simulated multi-axial loading, and a reasonable agreement of the resulting fracture stress with experiments is obtained. Finally, quasi-brittle stress-strain evolution with a tortuous crack path is also observed from the simulations and is consistent with experimental results.

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Research Organization:: Idaho National Lab. (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 1357605

Alternate ID(s):: OSTI ID: 1341167

Report Number(s):: INL/JOU-15-37467; PII: S0022311516301209

Journal Information:: Journal of Nuclear Materials, Vol. 475; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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References (23)

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