Modelling anelastic contribution to nuclear fuel cladding creep and stress relaxation

Ville Tulkki (Corresponding Author), Timo Ikonen

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

In fuel behaviour modelling accurate description of the cladding mechanical response is important for both operational and safety considerations. While accuracy is desired, a certain level of simplicity is needed as both computational resources and detailed information on properties of particular cladding may be limited. Most models currently used in the integral codes divide the mechanical response into elastic and viscoplastic contributions. These have difficulties in describing both creep and stress relaxation, and often separate models for the two phenomena are used. In this paper we implement anelastic contribution to the cladding mechanical model, thus enabling consistent modelling of both creep and stress relaxation. We show that the model based on assumption of viscoelastic behaviour can be used to explain several experimental observations in transient situations and compare the model to published set of creep and stress relaxation experiments performed on similar samples. Based on the analysis presented we argue that the inclusion of anelastic contribution to the cladding mechanical models provides a way to improve the simulation of cladding behaviour during operational transients.
Original languageEnglish
Pages (from-to)34-41
JournalJournal of Nuclear Materials
Volume465
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Fingerprint

Nuclear fuel cladding
nuclear fuels
stress relaxation
Stress relaxation
Creep
safety
resources
inclusions

Keywords

  • Zircaloy-4
  • Cladding
  • Stress relaxation
  • Creep
  • Anelastic
  • Viscoelastic
  • Modelling

Cite this

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title = "Modelling anelastic contribution to nuclear fuel cladding creep and stress relaxation",
abstract = "In fuel behaviour modelling accurate description of the cladding mechanical response is important for both operational and safety considerations. While accuracy is desired, a certain level of simplicity is needed as both computational resources and detailed information on properties of particular cladding may be limited. Most models currently used in the integral codes divide the mechanical response into elastic and viscoplastic contributions. These have difficulties in describing both creep and stress relaxation, and often separate models for the two phenomena are used. In this paper we implement anelastic contribution to the cladding mechanical model, thus enabling consistent modelling of both creep and stress relaxation. We show that the model based on assumption of viscoelastic behaviour can be used to explain several experimental observations in transient situations and compare the model to published set of creep and stress relaxation experiments performed on similar samples. Based on the analysis presented we argue that the inclusion of anelastic contribution to the cladding mechanical models provides a way to improve the simulation of cladding behaviour during operational transients.",
keywords = "Zircaloy-4, Cladding, Stress relaxation, Creep, Anelastic, Viscoelastic, Modelling",
author = "Ville Tulkki and Timo Ikonen",
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}

Modelling anelastic contribution to nuclear fuel cladding creep and stress relaxation. / Tulkki, Ville (Corresponding Author); Ikonen, Timo.

In: Journal of Nuclear Materials, Vol. 465, 2015, p. 34-41.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Modelling anelastic contribution to nuclear fuel cladding creep and stress relaxation

AU - Tulkki, Ville

AU - Ikonen, Timo

N1 - LIS: 24 embargo 3.6.2015-> tarkista Project code: 102531

PY - 2015

Y1 - 2015

N2 - In fuel behaviour modelling accurate description of the cladding mechanical response is important for both operational and safety considerations. While accuracy is desired, a certain level of simplicity is needed as both computational resources and detailed information on properties of particular cladding may be limited. Most models currently used in the integral codes divide the mechanical response into elastic and viscoplastic contributions. These have difficulties in describing both creep and stress relaxation, and often separate models for the two phenomena are used. In this paper we implement anelastic contribution to the cladding mechanical model, thus enabling consistent modelling of both creep and stress relaxation. We show that the model based on assumption of viscoelastic behaviour can be used to explain several experimental observations in transient situations and compare the model to published set of creep and stress relaxation experiments performed on similar samples. Based on the analysis presented we argue that the inclusion of anelastic contribution to the cladding mechanical models provides a way to improve the simulation of cladding behaviour during operational transients.

AB - In fuel behaviour modelling accurate description of the cladding mechanical response is important for both operational and safety considerations. While accuracy is desired, a certain level of simplicity is needed as both computational resources and detailed information on properties of particular cladding may be limited. Most models currently used in the integral codes divide the mechanical response into elastic and viscoplastic contributions. These have difficulties in describing both creep and stress relaxation, and often separate models for the two phenomena are used. In this paper we implement anelastic contribution to the cladding mechanical model, thus enabling consistent modelling of both creep and stress relaxation. We show that the model based on assumption of viscoelastic behaviour can be used to explain several experimental observations in transient situations and compare the model to published set of creep and stress relaxation experiments performed on similar samples. Based on the analysis presented we argue that the inclusion of anelastic contribution to the cladding mechanical models provides a way to improve the simulation of cladding behaviour during operational transients.

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KW - Stress relaxation

KW - Creep

KW - Anelastic

KW - Viscoelastic

KW - Modelling

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JF - Journal of Nuclear Materials

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