Crystal plasticity finite element modelling of low cycle fatigue in fcc metals. (November 2015)

• Record Type: Journal Article
• Authors: Grilli, Nicolò; Janssens, Koenraad G.F.; Van Swygenhoven, Helena
• Is Part Of: Journal of the mechanics and physics of solids. Volume 84(2015:Nov.)
• Page Start: 424
• Page End: 435
• Publication Date: 2015-11
• Subjects: Dislocations -- Crystal plasticity -- Fatigue -- Finite element method; Mechanics, Applied -- Periodicals; Solids -- Periodicals; Mechanics -- Periodicals; Mécanique appliquée -- Périodiques; Solides -- Périodiques; Mechanics, Applied; Solids; Periodicals; 531.05
• DOI: 10.1016/j.jmps.2015.08.007
• Languages: English
• ISSNs: 0022-5096

Abstract

Abstract: A new dislocation-based model for low cycle fatigue in fcc metals at a length scale smaller than the feature size of the dislocation structures is presented. It uses the crystal plasticity finite element method and dislocation densities as internal variables. Equations for the dipole distance distribution, for the double cross slip mechanism and a new dislocation multiplication law are introduced, which can predict the emergence of vein and channel structures starting from a randomly perturbed dislocation distribution. The characteristics of these structures in copper and aluminium, as well as the mechanical properties, are compared with experiments. Compared with existing density-based theories, the capability to reproduce dislocation patterning is a significant step forward.