Ensemble averaging stress-strain fields in polycrystalline aggregates with a constrained surface microstructure-Part 1: Computational tools and application to anisotropic elastic behaviourReportar como inadecuado




Ensemble averaging stress-strain fields in polycrystalline aggregates with a constrained surface microstructure-Part 1: Computational tools and application to anisotropic elastic behaviour - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

* Corresponding author 1 MAT - Centre des Matériaux 2 EDF 3 Arcelor Research

Abstract : The effect of three-dimensional grain morphology on the deformation at a free surface in polycrystalline aggregates is investigated by means of a large scale finite element and statistical approach. For a given 2D surface at z=0 containing 39 grains with given lattice orientations, 17 random 3D polycrystalline aggregates are constructed having different 3D grain shapes and orientations except at z=0, based on an original 3D image analysis procedure. They are subjected to overall tensile loading conditions. The resulting stress-strain fields at the free surface z=0 are analysed. Ensemble average and variance maps of the stress field at the observed surface are computed. In the case of an anisotropic elastic behaviour of the grains, fluctuations ranging between 5% and 60% are found in the equivalent stress level at a given material point of the observed surface from one realization of the microstructure to another. The obtained fields are compared to the prediction based on the associated columnar grain microstructure, often used in literature. These results have important implications in the way of comparing finite element simulations and surface strain field measurements in metal polycrystals.





Autor: Samuel Forest - Asmahana Zeghadi - Franck N-Guyen - Anne-Francoise Gourgues - Olivier Bouaziz -

Fuente: https://hal.archives-ouvertes.fr/



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