Modeling deformation of materials and structures of nuclear power engineering subjected to thermal-radiation effects
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O R I G I NA L A RT I C L E
Vasilii A. Gorokhov · Sergei A. Kapustin · Yuri A. Churilov · Leonid A. Igumnov
Modeling deformation of materials and structures of nuclear power engineering subjected to thermal-radiation effects
Received: 6 August 2020 / Accepted: 22 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The present paper develops a version of a compound hierarchical model of materials, which implements a possibility of representing a complex process of the development of interrelated deformation effects in the form of a succession of formally independent elementary acts described by the related particular models of irradiation-induced swelling, plasticity, thermal and irradiation creep. In describing actual processes, the interaction and mutual effect of such elementary acts are taken into account on the top level of the compound model, providing for the successive initialization of the particular models and updating their constituent parameters (stresses and parameters characterizing the history of elastoviscoplastic deformation of materials). Using the example of steel Kh16N11KM3, a number of benchmark problems have been analyzed. The obtained results show that the developed software product can be effectively used for analyzing problems of deformation of structures under thermal-radiation effects. The process of deformation of a model of a shell ring of a fastneutron reactor reflector made of steel Kh16N11M3 in the conditions of spatial thermal-radiation effects has been numerically analyzed. Keywords Stainless steel · Neutron irradiation · Swelling · Plasticity · Creep · Finite-element method
1 Introduction The results of studying the effect of neutron irradiation on mechanical properties of materials used in LWR-type reactors are presented in [1]. The effect of the stressed state type on irradiation-induced swelling and creep of austenitic steels was analyzed in [2]. One of the conclusions of the above paper is that the effect of stresses on irradiation-induced swelling can be described with one parameter, that is a linear function of hydrostatic stress and stress intensity. Correlation between radiation effects and embrittlement of structural materials was Communicated by Andreas Öchsner. V. A. Gorokhov · S. A. Kapustin · Y. A. Churilov · L. A. Igumnov (B) Research Institute for Mechanics, National Research Lobachevsky State University of Nizhny Novgorod, 23 Gagarin Avenue, building 6, Nizhny Novgorod, Russian Federation 603950 E-mail: [email protected] V. A. Gorokhov E-mail: [email protected] S. A. Kapustin E-mail: [email protected] Y. A. Churilov E-mail: [email protected]
V. A. Gorokhov et al.
studied in [3,4]. The effect of irradiation-induced swelling on the laws of deformation and failure of irradiated austenitic steels was investigated in [5,6]. Article [5] tackles special features of failure of irradiated steels under static loading and the effect of irradiation-induced swelling, test temperature and cyclic pre-straining on plasticity and crack
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