FEMU based on Levengerg-Marquardt algorithm to identify creep behavior of Zircaloy-4 fuel rods under LOCA conditions
Résumé
A custom experimental setup has been designed to investigate the secondary creep behavior of Zircaloy-4 fuel rods under Loss Of Coolant Accident (LOCA) conditions. Creep test are ran at elevated temperatures (from 700 to 900 °C) and the fuel rods are internally pressurized from 10 to 50 bars. The setup induces a non-uniform axial temperature profile. Three stress loadings are applied in a single test. Thermal and steady-state creep-rates are calculated from these experiments. A Finite Element Model Updating (FEMU) based on the Levenberg-Marquardt algorithm is proposed to identify a five power creep law behavior. Preliminary results about the creep behavior of as received Zircaloy-4 fuel rods are here presented.
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