Viscoelastic modeling of Zircaloy cladding in-pile transient creep

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 stress response is important for both operational and safety considerations. The cladding creep determines in part the width of the gas gap, the duration to pellet-cladding contact and the stresses to the cladding due to the pellet expansion. Conventionally the strain hardening rule has been used to describe the creep response to transient loads in engineering applications. However, it has been well documented that the strain hardening rule does not describe well results of tests with load drops or reversals. In our earlier work we have developed a model for primary creep which can be used to simulate the in- and out-of-pile creep tests. Since then several creep experiments have entered into public domain. In this paper we develop the model formulation based on the theory of viscoelasticity, and show that this model can reproduce the new experimental results. We also show that the creep strain recovery encountered in experimental measurements can be explained by viscoelastic behaviour.
Original languageEnglish
Pages (from-to)324 - 329
JournalJournal of Nuclear Materials
Volume457
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Fingerprint

piles
Piles
Creep
strain hardening
pellets
transient loads
Strain hardening
creep tests
viscoelasticity
safety
recovery
Viscoelasticity
engineering
formulations
Contacts (fluid mechanics)
expansion
Gases
gases
Recovery
Experiments

Keywords

  • zircaloy
  • creep
  • stress transient
  • standard linear solid
  • viscoelastic

Cite this

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title = "Viscoelastic modeling of Zircaloy cladding in-pile transient creep",
abstract = "In fuel behaviour modelling accurate description of the cladding stress response is important for both operational and safety considerations. The cladding creep determines in part the width of the gas gap, the duration to pellet-cladding contact and the stresses to the cladding due to the pellet expansion. Conventionally the strain hardening rule has been used to describe the creep response to transient loads in engineering applications. However, it has been well documented that the strain hardening rule does not describe well results of tests with load drops or reversals. In our earlier work we have developed a model for primary creep which can be used to simulate the in- and out-of-pile creep tests. Since then several creep experiments have entered into public domain. In this paper we develop the model formulation based on the theory of viscoelasticity, and show that this model can reproduce the new experimental results. We also show that the creep strain recovery encountered in experimental measurements can be explained by viscoelastic behaviour.",
keywords = "zircaloy, creep, stress transient, standard linear solid, viscoelastic",
author = "Ville Tulkki and Timo Ikonen",
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Viscoelastic modeling of Zircaloy cladding in-pile transient creep. / Tulkki, Ville (Corresponding Author); Ikonen, Timo.

In: Journal of Nuclear Materials, Vol. 457, 2015, p. 324 - 329.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Viscoelastic modeling of Zircaloy cladding in-pile transient creep

AU - Tulkki, Ville

AU - Ikonen, Timo

N1 - Project code: 81655

PY - 2015

Y1 - 2015

N2 - In fuel behaviour modelling accurate description of the cladding stress response is important for both operational and safety considerations. The cladding creep determines in part the width of the gas gap, the duration to pellet-cladding contact and the stresses to the cladding due to the pellet expansion. Conventionally the strain hardening rule has been used to describe the creep response to transient loads in engineering applications. However, it has been well documented that the strain hardening rule does not describe well results of tests with load drops or reversals. In our earlier work we have developed a model for primary creep which can be used to simulate the in- and out-of-pile creep tests. Since then several creep experiments have entered into public domain. In this paper we develop the model formulation based on the theory of viscoelasticity, and show that this model can reproduce the new experimental results. We also show that the creep strain recovery encountered in experimental measurements can be explained by viscoelastic behaviour.

AB - In fuel behaviour modelling accurate description of the cladding stress response is important for both operational and safety considerations. The cladding creep determines in part the width of the gas gap, the duration to pellet-cladding contact and the stresses to the cladding due to the pellet expansion. Conventionally the strain hardening rule has been used to describe the creep response to transient loads in engineering applications. However, it has been well documented that the strain hardening rule does not describe well results of tests with load drops or reversals. In our earlier work we have developed a model for primary creep which can be used to simulate the in- and out-of-pile creep tests. Since then several creep experiments have entered into public domain. In this paper we develop the model formulation based on the theory of viscoelasticity, and show that this model can reproduce the new experimental results. We also show that the creep strain recovery encountered in experimental measurements can be explained by viscoelastic behaviour.

KW - zircaloy

KW - creep

KW - stress transient

KW - standard linear solid

KW - viscoelastic

U2 - 10.1016/j.jnucmat.2014.11.100

DO - 10.1016/j.jnucmat.2014.11.100

M3 - Article

VL - 457

SP - 324

EP - 329

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

ER -