Modelling strain localization in Ti–6Al–4V at high loading rate: a phenomenological approach. (25th November 2019)

• Record Type: Journal Article
• Authors: Zhou, Rongxin; Pang, Ka Ho; Bisht, Anuj; Roy, Anish; Suwas, Satyam; Silberschmidt, Vadim V.
• Is Part Of: Philosophical transactions. Volume 378:Number 2162(2020)
• Publication Date: 2019-11-25
• Subjects: Ti–6AI–4V -- localization -- crystal plasticity -- finite-element analysis; Physical sciences -- Periodicals; Engineering -- Periodicals; Mathematics -- Periodicals; 500
• DOI: 10.1098/rsta.2019.0105
• Languages: English
• ISSNs: 1364-503X

Abstract

Abstract : A phenomenological approach, based on a combination of a damage mechanism and a crystal plasticity model, is proposed to model a process of strain localization in Ti–6AI–4V at a high strain rate of 10 3 s −1 . The proposed model is first calibrated employing a three-dimensional representative volume element model. The calibrated parameters are then employed to investigate the process of onset of strain localization in the studied material. A suitable mesh size is chosen for the proposed model by implementing a mesh-sensitivity study. The influence of boundary conditions on the initiation of the strain localization is also studied. A variation of crystallographic orientation in the studied material after the deformation process is characterized, based on results for different boundary conditions. The study reveals that the boundary conditions significantly influence the formation of shear bands as well as the variation of crystallographic orientation in the studied material. Results also indicate that the onset of strain localization can affect considerably the material's behaviour. This article is part of the theme issue 'Modelling of dynamic phenomena and localization in structured media (part 2)'.