Validity of Crystal Plasticity Models Near Grain Boundaries: Contribution of Elastic Strain Measurements at Micron Scale
Article dans une revue avec comité de lecture
Synchrotron Laue microdiffraction and digital image correlation measurements were coupled to track the elastic strain field (or stress field) and the total strain field near a general grain boundary in a bent bicrystal. A 316L stainless steel bicrystal was deformed in situ into the elasto-plastic regime using a four-point bending setup. The test was then simulated using finite elements with a crystal plasticity model comprising internal variables (dislocation densities on discrete slip systems). The predictions of the model are compared with both the total strain field and the elastic strain field obtained experimentally. While activated slip systems and total strains are reasonably well predicted, elastic strains appear overestimated next to the grain boundary. This suggests that conventional crystal plasticity models need improvement to correctly model stresses at grain boundaries.
Showing items related by title, author, creator and subject.
On the Accuracy of Elastic Strain Field Measurements by Laue Microdiffraction and High-Resolution EBSD: a Cross-Validation Experiment Article dans une revue avec comité de lecturePLANCHER, Emeric; PETIT, Johann; MAURICE, Claire; FAVIER, Véronique; SAINTOYANT, Lucie; LOISNARD, Dominique; RUPIN, N.; MARIJON, Jean-Baptiste; ULRICH, Olivier; BORNERT, Michel; MICHA, Jean Sébastien; ROBACH, Odile; CASTELNAU, Olivier (Society for Experimental Mechanics, 2016)Determining the accuracy of elastic strain measurements in plastically deformed alloys is an experimental challenge. To develop a novel cross-validation procedure, a controlled elasto-plastic strain gradient was created ...
Direct measurement of local constitutive relations, at the micrometre scale, in bulk metallic alloys Article dans une revue avec comité de lecturePLANCHER, E; MAURICE, C; FAVIER, V; LOISNARD, D; RUPIN, N; MARIJON, Jean-Baptiste; MICHA, Jean-Sébastien; ROBACH, Odile; CASTELNAU, Olivier; BOSSO, E; STODOLNA, J; PETIT, J (International Union of Crystallography, 2017)Multiscale models involving crystal plasticity are essential to predict the elastoplastic behavior of structural materials with respect to their microstructure. However, those models are often limited by a poor knowledge ...
Article dans une revue avec comité de lectureHEKTOR, Johan; MARIJON, Jean-Baptiste; RISTINMAA, Matti; HALL, Stephen A.; HALLBERG, Hakan; SRINIVASAN, Iyengar; MICHA, Jean-Sébastien; ROBACH, Odile; GRENNERAT, Fanny; CASTELNAU, Olivier (Elsevier, 2018)We have used Differential Aperture X-ray Microscopy (DAXM) to measure grain orientations and deviatoric elastic strains in 3D around a tin whisker. The results show strain gradients through the depth of the tin coating, ...
Determination of deviatoric elastic strain and lattice orientation by applying digital image correlation to Laue microdiffraction images: The enhanced Laue-DIC method Article dans une revue avec comité de lectureZHANG, F. G; CASTELNAU, Olivier; BORNERT, Michel; MARIJON, Jean-Baptiste; PLANCHER, Emeric; PETIT, Johann (International Union of Crystallography, 2015)A new method of determining the deviatoric elastic strain and lattice orientation from Laue microdiffraction images is presented. Standard data treatment methods can suffer from the difficulty of precisely pinpointing the ...
Article dans une revue avec comité de lectureLOYER, Camille; FERREIRA, Paulo; MARIJON, Jean-Baptiste; MICHEL, Vincent; REGNIER, Gilles; VERA, Julie; DUVAL, Vincent; RICHAUD, Emmanuel (Elsevier BV, 2022-01-31)Embrittlement caused by injection molding was investigated on a commercial grade of Polybutylene terephthalate (PBT). The effect of temperature and residence time in the barrel on mechanical properties was studied. Results ...