A link between microstructure evolution and macroscopic response in elasto-plasticity: Formulation and numerical approximation of the higher-dimensional continuum dislocation dynamics theory. (September 2015)

• Record Type: Journal Article
• Authors: Sandfeld, Stefan; Thawinan, Ekkachai; Wieners, Christian
• Is Part Of: International journal of plasticity. Volume 72(2015:Sep.)
• Page Start: 1
• Page End: 20
• Publication Date: 2015-09
• Subjects: A. Dislocations -- A. Microstructures -- B. Crystal plasticity -- C. Finite elements -- Continuum theory; Plasticity -- Periodicals; Plasticité -- Périodiques; Plasticity; Periodicals; 620.11233
• DOI: 10.1016/j.ijplas.2015.05.001
• Languages: English
• ISSNs: 0749-6419

Abstract

Abstract: Micro-plasticity theories and models are suitable to explain and predict mechanical response of devices on length scales where the influence of the carrier of plastic deformation – the dislocations – cannot be neglected or completely averaged out. To consider these effects without resolving each single dislocation a large variety of continuum descriptions has been developed, amongst which the higher-dimensional continuum dislocation dynamics (hdCDD) theory by Hochrainer et al. (Phil. Mag. 87, pp. 1261–1282) takes a different, statistical approach and contains information that are usually only contained in discrete dislocation models. We present a concise formulation of hdCDD in a general single-crystal plasticity context together with a discontinuous Galerkin scheme for the numerical implementation which we evaluate by numerical examples: a thin film under tensile and shear loads. We study the influence of different realistic boundary conditions and demonstrate that dislocation fluxes and their lines' curvature are key features in small-scale plasticity. Highlights: A continuum theory for predicting flow of curved dislocation. Linking dislocation microstructure to macroscopic elasto-plastic response. Application of a discontinuous Galerkin scheme for accurate and efficient solution.