Prediction of localized necking based on crystal plasticity: Comparison of bifurcation and imperfection approaches
| Autor: | Mohamed Ben Bettaieb, Holanyo K. Akpama, Farid Abed-Meraim |
|---|---|
| Přispěvatelé: | Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Labex DAMAS, Université de Lorraine (UL), ANR-11-LABX-0008,DAMAS,Design des Alliages Métalliques pour Allègement des Structures(2011) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Crystal plasticity [PHYS.MECA.GEME]Physics [physics]/Mechanics [physics]/Mechanical engineering [physics.class-ph] 02 engineering and technology 01 natural sciences Instability [SPI.MAT]Engineering Sciences [physics]/Materials [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph] [SPI]Engineering Sciences [physics] Bifurcation theory Microstructure–ductility relationships 0103 physical sciences [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph] Forming limit diagrams [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph] Formability General Materials Science Anisotropy Microscale chemistry Bifurcation 010302 applied physics business.industry Mécanique [Sciences de l'ingénieur] Mechanical Engineering Imperfection approach Plastic instabilities Mechanics Structural engineering [CHIM.MATE]Chemical Sciences/Material chemistry [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph] 021001 nanoscience & nanotechnology Selfconsistent scale transition Mechanics of Materials visual_art visual_art.visual_art_medium 0210 nano-technology Sheet metal business Necking |
| Zdroj: | 16th International Conference Metal Forming (Metal Forming 2016) 16th International Conference Metal Forming (Metal Forming 2016), Sep 2016, Krakow, Poland. pp.779-790 Key Engineering Materials Key Engineering Materials, Trans Tech Publications, 2016, 716, pp.779-789. ⟨10.4028/www.scientific.net/KEM.716.779⟩ HAL |
| ISSN: | 1013-9826 1662-9795 |
| DOI: | 10.4028/www.scientific.net/KEM.716.779⟩ |
| Popis: | International audience; In the present work, a powerful modeling tool is developed to predict and analyze the onset of strain localization in polycrystalline aggregates. The predictions of localized necking are based on two plastic instability criteria, namely the bifurcation theory and the initial imperfection approach. In this tool, a micromechanical model, based on the self-consistent scale-transition scheme, is used to accurately derive the mechanical behavior of polycrystalline aggregates from that of their microscopic constituents (the single crystals). The mechanical behavior of the single crystals is developed within a large strain rate-independent constitutive framework. This micromechanical constitutive modeling takes into account the essential microstructure-related features that are relevant at the microscale. These microstructural aspects include key physical mechanisms, such as initial and induced crystallographic textures, morphological anisotropy and interactions between the grains and their surrounding medium. The developed tool is used to predict sheet metal formability through the concept of forming limit diagrams (FLDs). The results obtained by the self-consistent averaging scheme, in terms of predicted FLDs, are compared with those given by the more classical full-constraint Taylor model. Moreover, the predictions obtained by the imperfection approach are systematically compared with those given by the bifurcation analysis, and it is demonstrated that the former tend to the latter in the limit of a vanishing size for the initial imperfection. |
| Databáze: | OpenAIRE |
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