Ensemble averaging stress–strain fields in polycrystalline aggregates with a constrained surface microstructure – Part 2: crystal plasticity
| Autor: | Zeghadi, Asmahana, N'Guyen, Franck, Forest, Samuel, Gourgues-Lorenzon, Anne-Françoise, Bouaziz, Olivier |
|---|---|
| Přispěvatelé: | EDF R&D (EDF R&D), EDF (EDF), Centre des Matériaux (MAT), MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Arecelor Research |
| Rok vydání: | 2007 |
| Předmět: |
010302 applied physics
Materials science Ensemble averaging Stress–strain curve Mineralogy 02 engineering and technology Slip (materials science) Plasticity 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences [SPI.MAT]Engineering Sciences [physics]/Materials Free surface 0103 physical sciences Ultimate tensile strength Crystallite Composite material 0210 nano-technology |
| Zdroj: | Philosophical Magazine Philosophical Magazine, Taylor & Francis, 2007, 87, pp.1425-1446. ⟨10.1080/14786430601009517⟩ |
| ISSN: | 1478-6443 1478-6435 |
| DOI: | 10.1080/14786430601009517 |
| Popis: | International audience; 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, eight 3D random 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 continuum crystal plasticity framework is adopted and the resulting plastic strain fields at the free surface z=0 are analysed. Ensemble average and variance maps of the plastic strain field at the observed free surface are computed. In the case of elastoplastic copper grains, fluctuations ranging between 2% and 80% are found in the equivalent plastic slip 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. The presented results have important implications in the way of comparing finite element simulations and experimental strain or lattice rotation field measurements in metal polycrystals. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|