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- W3025665645 abstract "Irradiated polycrystals are known to exhibit an intense localization of plastic deformation at the grain scale, responsible for a severe loss of ductility and increased sensitivity to intergranular stress corrosion cracking. This thesis takes advantage of the performances offered by the recent progresses of highly parallel FFT-based solvers, to improve the modeling of this crucial phenomenon. We developed field processing methods to produce a systematic analysis of the nature and quantitative characterization of localization bands, from high resolution polycrystalline simulation results. They allowed to evidence a fundamental shortcoming of classical crystal plasticity, cornerstone of all irradiated metals models, in the prediction of intragranular localization modes. To overcome this issue, we extended the scope of our FFT solver, AMITEX_FFTP, to nonlocal mechanics. We used it to extensively study the analytical and numerical predictions of a strain gradient plasticity model, showing that it is a promising way to achieve an accurate modeling of plastic slip localization modes in softening polycrystals, and a fortiori for irradiated metals. Additionally, we explored the explicit modeling of slip bands with FFT-based solvers. We developed generic composite voxel models allowing to strongly reduce its computational cost. We show that this approach provides an efficient way to simulate the consequences of strain localization, such as the evolution of the grain boundary stress distribution or the increased kinematic hardening." @default.
- W3025665645 created "2020-05-21" @default.
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- W3025665645 date "2019-11-20" @default.
- W3025665645 modified "2023-09-23" @default.
- W3025665645 title "Numerical simulation of strain localization in irradiated polycristals" @default.
- W3025665645 hasPublicationYear "2019" @default.
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