A full-field crystal-plasticity analysis of bimodal polycrystals

A full field crystal plasticity modelling of bimodal polycrystals is presented. Bimodal polycrystals are generated using a controlled Laguerre–Voronoi algorithm, and a modified phenomenological law is used to take into account the grain size effect through a Hall–Petch term. A focus is particularly...

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Bibliographic Details
Published in:International journal of solids and structures 2020-02, Vol.184, p.178-192
Main Authors: Flipon, B., Keller, C., Quey, R., Barbe, F.
Format: Article
Language:English
Subjects:
Algorithms
Bimodal microstructure
Condensed Matter
Full-field crystal plasticity
Grain size
Grain size effect
Laguerre–Voronoi tessellations
Materials Science
Physics
Plastic properties
Polycrystals
Size effects
Spatial distribution
Strain localization
Stress concentration
Ultrafines
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Summary:A full field crystal plasticity modelling of bimodal polycrystals is presented. Bimodal polycrystals are generated using a controlled Laguerre–Voronoi algorithm, and a modified phenomenological law is used to take into account the grain size effect through a Hall–Petch term. A focus is particularly made on the effects of grain size and of grain size ratio between ultrafine grains and coarse grains populations on local and global mechanical responses. The effect of the spatial distribution of the coarse grains (clustered or isolated) is also analysed in terms of strain localisation and stress concentration at the local scale.
ISSN:0020-7683
1879-2146
DOI:10.1016/j.ijsolstr.2019.02.005