Polycrystalline simulations of in-reactor deformation of recrystallized Zircaloy-4 tubes: Fast Fourier Transform computations and mean-field self-consistent model - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles International Journal of Plasticity Year : 2022

Polycrystalline simulations of in-reactor deformation of recrystallized Zircaloy-4 tubes: Fast Fourier Transform computations and mean-field self-consistent model

Abstract

Fuel cladding and structural components made of zirconium alloys, used in light and heavy water nuclear reactors, exhibit, during normal operation, significant in-reactor deformation. Fast Fourier Transform (FFT) simulations have been conducted on large grain aggregates to simulate the in-reactor behavior of recrystallized Zircaloy-4. Original constitutive equations have been proposed to account, at the microscopic scale, for thermal creep, irradiation creep and irradiation induced growth. The evolution of irradiation defects with irradiation is taken into account, especially to deduce the local growth strain. A good description of the in-reactor behavior is obtained with irradiation defects evolution consistent with Transmission Electron Microscopy observations. The FFT simulations are compared to a self-consistent model. A good agreement is obtained when the behavior is linear (irradiation creep and growth) while the nonlinear response (thermal creep) is underestimated by the self-consistent model. The FFT simulations are also compared to the lower-bound model which neglects the interactions between grains. The lower-bound model underestimates the growth strain proving the importance of using an accurate polycrystalline model to predict the growth strain from the knowledge of the irradiation defect evolution.
Fichier principal
Vignette du fichier
ArticleAMITEX-AVESC-juin2021-v8-soumisEDF-FRA (1).pdf (1.68 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

cea-03758977 , version 1 (23-09-2022)

Identifiers

  • HAL Id : cea-03758977 , version 1

Cite

Fabien Onimus, Lionel Gelebart, Renald Brenner. Polycrystalline simulations of in-reactor deformation of recrystallized Zircaloy-4 tubes: Fast Fourier Transform computations and mean-field self-consistent model. International Journal of Plasticity, 2022, 153, pp.103272. ⟨cea-03758977⟩
19 View
99 Download

Share

Gmail Facebook X LinkedIn More