IFMA - Institut Français de Mécanique Avancée (Clermont Université, Institut Français de Mécanique Avancée (IFMA) / Laboratoire de Mécanique et Ingénieries (LaMI), BP 10448 - F-63000 Clermont Ferrand - France)
Abstract : The spatial variability of stress fields resulting from polycrystalline aggregate calculations involving random grain geometry and crystal orientations is investigated. A periodogram-based method is proposed to identify the properties of homogeneous Gaussian random fields (power spectral density and related covariance structure). Based on a set of finite element polycrystalline aggregate calculations the properties of the maximal principal stress field are identified. Two cases are considered, using either a fixed or random grain geometry. The stability of the method w.r.t the number of samples and the load level (up to 3.5 \% macroscopic deformation) is investigated.
https://hal-enpc.archives-ouvertes.fr/hal-00660409
Contributeur : Bruno Sudret
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Soumis le : lundi 16 janvier 2012 - 16:29:08
Dernière modification le : mardi 6 mars 2018 - 15:58:00
Document(s) archivé(s) le : mardi 17 avril 2012 - 02:36:20
Bruno Sudret, Hung Dang, Marc Berveiller, Asmahana Zeghadi. Statistical inference of 2D random stress fields obtained from polycrystalline aggregate calculations. International Journal of Fracture, Springer Verlag, 2012, pp.1-30. ⟨hal-00660409⟩
