Numerical analysis of the influence of scale effects and microstructure on hydrogen diffusion in polycrystalline aggregates

作者: Esaie Legrand , Jamaa Bouhattate , Xavier Feaugas , Sébastien Touzain , Hamid Garmestani

DOI: 10.1016/J.COMMATSCI.2013.01.018

关键词:

摘要: Predicting resistance to environmental degradation, especially hydrogen embrittlement (HE) has become a major concern for life assessment and risk analysis of structural materials. The microstructure the materials plays significant role in HE. Despite large documentation about subject, contribution diffusion on this process stays unclear. In work, we analyze effects diffusion, influence grain boundaries considered as high diffusivity paths possible sites damage occurrence. Electrochemical permeation was simulated using finite elements method (FEM). Scale between RVE (Representative Volume Element) size membrane are discussed. Domains applicability standard homogenization methods, Hashin–Shtrikman model studied results from microstructural based FEM. invariance behavior concentration profiles shapes also analyzed. Thus, difficulty extract properties by test heterogeneous microstructures is highlighted

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