|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Computational Methods for Spatio-temporal Scale-bridging: from Atomistics to Mesoscale
||A Quantized Crystal Plasticity Model for Nanocrystalline Metals: Connecting Atomistic Simulations and Physical Experiments
||Lin Li, Paul Christodoulou, Peter Anderson
|On-Site Speaker (Planned)
This work explores spatio-temporal scale-bridging in nanocrystalline (NC) metals by using molecular dynamics (MD) simulations to inform quantized crystal plasticity (QCP) continuum simulations. This coupling allows information on single slip events in MD simulations to inform 1000-grain continuum simulations that are concurrent with experiments. This multi-scale approach reveals that the critical resolved shear stress for slip events has a large grain-to-grain variation within NC metals. Relatively soft grains are balanced by a smaller fraction of hard grains. New simulations explore various rules for hardening and softening within grains, in terms of the effect on macro stress-strain and hysteretic response, and internal stress evolution. The results are used to study the nature of hardening and softening in NC metals, in terms of the evolution in grain boundary pinning sites with deformation and time.
||Planned: A print-only volume