CUED Publications database

Computing Creep-Damage Interactions in Irradiated Concrete

Giorla, AB and Le Pape, Y and Dunant, CF (2016) Computing Creep-Damage Interactions in Irradiated Concrete. Journal of Nanomechanics and Micromechanics, 7. ISSN 2153-5434 (Unpublished)

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Among various degradation mechanisms possibly affecting the long-term operation of nuclear power plants, the effects of induced expansion and internal degradation occurring in concrete exposed to high-flux neutron radiation require additional research. Notably, using short-term test-reactor data to assess the long-term structural significance of light-water reactor concrete biological shields necessitates properly capturing the concurrent time-dependent effects, e.g., creep and damage caused by radiation-induced volumetric degradation. As this poses significant numerical challenges, a creep-damage algorithm was developed to account simultaneously for the progress of damage and viscoelastic processes in the concrete microstructure. The algorithm uses a time-adaptive scheme in which the instants at which damage occurs are explicitly searched for. This provides a nonlocal continuum damage procedure with very low sensitivity to the time or loading step. The proposed method is then used to simulate creep and restraint effects on radiation-induced degradation in concrete.

Item Type: Article
Uncontrolled Keywords: irradiation concrete numerical model mesoscale creep damage radiation-induced volumetric swelling.
Divisions: Div D > Structures
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:25
Last Modified: 22 May 2018 08:20