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Comportement et rupture de gaines en zircaloy-4 détendu vierges, hydrurées ou irradiées en situation accidentelle de type RIA

Abstract : The purpose of this study is to characterize and simulate the mechanical behaviour and failure of fresh, hydrided and irradiated (in pressurized water reactors) cold-worked stress relieved Zircaloy-4 fuel claddings under reactivity initiated accident conditions. A model is proposed to describe the anisotropic viscoplastic mechanical behavior of the material as a function of temperature (from 20°C up to 1100°C), strain rate (from 3.10-4 s-1 up to 5 s-1), fluence (from 0 up to 1026 n.m-2) and irradiation conditions. Axial tensile, hoop tensile, expansion due to compression and hoop plane strain tensile tests are performed at 25°C, 350°C and 480°C in order to analyse the anisotropic plastic and failure
properties of the non-irradiated material hydrided up to 1200 ppm. Material strength and strain hardening depend on temperature and hydrogen in solid solution and precipitated hydride contents. Plastic anisotropy is not significantly modified by hydrogen. The material is embrittled by hydrides at room temperature. The plastic strain that leads to hydride cracking decreases with increasing hydrogen content. The material ductility, which increases with increasing temperature, is not deteriorated by hydrogen at 350°C and 480°C. Macroscopic fracture modes and damage mechanisms depend on specimen geometry, temperature and hydrogen content. A Gurson type model is finally proposed to describe
both the anisotropic viscoplastic behavior and the ductile fracture of the material as a function of temperature and hydrogen content.
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https://pastel.archives-ouvertes.fr/tel-00395361
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Submitted on : Monday, June 15, 2009 - 2:53:16 PM
Last modification on : Thursday, September 24, 2020 - 6:30:07 PM
Long-term archiving on: : Thursday, June 10, 2010 - 10:32:38 PM

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  • HAL Id : tel-00395361, version 1

Citation

Matthieu Le Saux. Comportement et rupture de gaines en zircaloy-4 détendu vierges, hydrurées ou irradiées en situation accidentelle de type RIA. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2008. Français. ⟨NNT : 2008ENMP1608⟩. ⟨tel-00395361⟩

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