|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
||A Crystal Plasticity Framework to Model Continuum Disconnections in Polycrystals
||Junan He, Himanshu Joshi, Nikhil Chandra Admal
|On-Site Speaker (Planned)
||Nikhil Chandra Admal
In this talk, we present a geometrically non-linear continuum model to describe shear coupling/GB plasticity within the disconnections-framework of GB motion, with an eventual goal to simulate large polycrystals. GBs are described as diffuse interfaces whose motion results in a plastic distortion (Fp) of the material. Fp describes plastic slip due to the combined effect of disconnections corresponding to various discrete modes. By accounting for the contribution of Fp in the multiplicative decomposition of the deformation gradient (F = FeFp), we demonstrate that an effective coupling predicted by the model not only depends on the available disconnection modes but also on the nature of the driving force, as observed in molecular dynamics simulations. In addition, we highlight the key differences between our crystal plasticity-based model and recent models for continuum disconnections.