A multi-scale model for stresses, strains and swelling of reactor components under irradiation

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Dudarev , S L , Mason , D R , Tarleton , E , Ma , P-W & Sand , A E 2018 , ' A multi-scale model for stresses, strains and swelling of reactor components under irradiation ' , Nuclear Fusion , vol. 58 , no. 12 , 126002 . https://doi.org/10.1088/1741-4326/aadb48

Title: A multi-scale model for stresses, strains and swelling of reactor components under irradiation
Author: Dudarev, Sergei L.; Mason, Daniel R.; Tarleton, Edmund; Ma, Pui-Wai; Sand, Andrea E.
Contributor organization: Department of Physics
Date: 2018-12
Language: eng
Number of pages: 16
Belongs to series: Nuclear Fusion
ISSN: 0029-5515
DOI: https://doi.org/10.1088/1741-4326/aadb48
URI: http://hdl.handle.net/10138/247817
Abstract: Predicting strains, stresses and swelling in nuclear power plant components exposed to irradiation directly from the observed or computed defect and dislocation microstructure is a fundamental problem of fusion power plant design that has so far eluded a practical solution. We develop a model, free from parameters not accessible to direct evaluation or observation, that is able to provide estimates for irradiation-induced stresses and strains on a macroscopic scale, using information about the distribution of radiation defects produced by high-energy neutrons in the microstructure of materials. The model exploits the fact that elasticity equations involve no characteristic spatial scale, and hence admit a mathematical treatment that is an extension to that developed for the evaluation of elastic fields of defects on the nanoscale. In the analysis given below we use, as input, the radiation defect structure data derived from ab initio density functional calculations and large-scale molecular dynamics simulations of high-energy collision cascades. We show that strains, stresses and swelling can be evaluated using either integral equations, where the source function is given by the density of relaxation volumes of defects, or they can be computed from heterogeneous partial differential equations for the components of the stress tensor, where the density of body forces is proportional to the gradient of the density of relaxation volumes of defects. We perform a case study where strains and stresses are evaluated analytically and exactly, and develop a general finite element method implementation of the method, applicable to a broad range of predictive simulations of strains and stresses induced by irradiation in materials and components of any geometry in fission or fusion nuclear power plants.
Subject: fusion reactor materials
neutron irradiation
radiation defects
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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