Mechanical response of biological shielding ring to variations in azimuthal neutron flux distribution

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F18%3A00322580" target="_blank" >RIV/68407700:21110/18:00322580 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Mechanical response of biological shielding ring to variations in azimuthal neutron flux distribution

Popis výsledku v původním jazyce

In this paper, the mechanical response of concrete ring to prolonged exposure to neutron irradiation is investigated. A three-dimensional finite element model of the concrete ring has been created. The radiation effect, represented by neutron flux, is modeled by volumetric swelling of aggregates and degradation of the mechanical parameters of concrete, based on latest literature review. Three different cases of the azimuthal flux distribution (uniform, sinusoidal and irregular) have been considered in order to investigate its effect on the analyzed structural element. The nonlinear plastic behavior of concrete is defined by the "μ damage model". As a result, displacement, isotropic damage and principal tensile stresses are obtained. According to the results of the analysis, the azimuthal distribution affects strongly the structural performance of the concrete ring. Its shielding and load-bearing properties under exposure to irregular azimuthal flux distribution may be compromised, while the structural response to the uniform azimuthal flux distribution is more acceptable. The results of the analysis are discussed in detail and the neglected factors, both positive and negative, are described. The presented analysis shows the complexity of this important problem and demonstrates the necessity for the research in this area to be continued.

Název v anglickém jazyce

Mechanical response of biological shielding ring to variations in azimuthal neutron flux distribution

Popis výsledku anglicky

In this paper, the mechanical response of concrete ring to prolonged exposure to neutron irradiation is investigated. A three-dimensional finite element model of the concrete ring has been created. The radiation effect, represented by neutron flux, is modeled by volumetric swelling of aggregates and degradation of the mechanical parameters of concrete, based on latest literature review. Three different cases of the azimuthal flux distribution (uniform, sinusoidal and irregular) have been considered in order to investigate its effect on the analyzed structural element. The nonlinear plastic behavior of concrete is defined by the "μ damage model". As a result, displacement, isotropic damage and principal tensile stresses are obtained. According to the results of the analysis, the azimuthal distribution affects strongly the structural performance of the concrete ring. Its shielding and load-bearing properties under exposure to irregular azimuthal flux distribution may be compromised, while the structural response to the uniform azimuthal flux distribution is more acceptable. The results of the analysis are discussed in detail and the neglected factors, both positive and negative, are described. The presented analysis shows the complexity of this important problem and demonstrates the necessity for the research in this area to be continued.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20102 - Construction engineering, Municipal and structural engineering

Projekt

<a href="/cs/project/8F17002" target="_blank" >8F17002: Efekt chemické sloučeniny betonu a jeho chování v dlouhodobém radioaktivním prostředí</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Mechanika 2018 Proceedings of the 23rd International Scientific Conference

ISBN

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ISSN

1822-2951

e-ISSN

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Počet stran výsledku

6

Strana od-do

83-88

Název nakladatele

Kaunas University of Technology

Místo vydání

Kaunas

Místo konání akce

Druskininkai

Datum konání akce

18. 5. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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