Thermo-mechanical simulations of laser heating experiments on UO2

JOURNAL OF NUCLEAR MATERIALS

卷:557

Article

Reymond, Matthieu^1,2  Sercombe, Jerome¹  Gallais, Laurent²  Doualle, Thomas^1,2  Pontillon, Yves¹ 

[1] CEA, DES, DEC, IRESNE, F-13108 St Paul Les Durance, France

[2] Aix Marseille Univ, CNRS, Cent Marseille, Inst Fresnel, Marseille, France

关键词: Nuclear fuel modeling;    Damage mechanics;    Laser heating;    Reactivity initiated accident;   

DOI  :  10.1016/j.jnucmat.2021.153220

来源: Elsevier

【 摘 要 】

In this paper, a thermo-mechanical model suitable for the interpretation of laser heating experiments simulating the power increasing phase of a RIA transient on UO2 samples is detailed. The thermal model includes a description of the heat deposition on the sample surface and of the heat transfer within the thickness and radius of the UO2 sample. The mechanical model describes cracking and crushing of the material depending on the loading mode (tension or compression dominated) and on temperature. The brittle - ductile transition in compression is in particular well reproduced. The parameters fitting is based on available uniaxial compression tests performed at high strain rates and on bending tests performed at moderate strain rates. The application of the mechanical model to annular laser heating experiments led to a good estimation of the crushing and cracking location (near the sample periphery), of the crack orientation (circumferential) and of the beginning of cracking. (C) 2021 Published by Elsevier B.V.

【 授权许可】

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