|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Computational Methods for Spatio-temporal Scale-bridging: from Atomistics to Mesoscale
||Characterization and Quantification of Crack Tip Plasticity in Crystalline Materials at Experimentally Achievable Strain Rate
||Subhendu Chakraborty, Jiaxi Zhang, Somnath Ghosh
|On-Site Speaker (Planned)
Molecular Dynamics is one of the most powerful model to understand the mechanisms involved in plastic deformation of metallic materials at atomistic level. But the stability requirement of the integration scheme limits the time step to femto-second which restricts the physical time that can be achieved with present computational capability in the range of nano-second. Therefore given current stage of computational resources, the strain rate used for metallic system is normally 10^7/s or even higher. Such unphysical high strain rate could mislead the investigation of deformation mechanism both quantitatively and qualitatively.
In our present effort of investigating the crack tip plasticity of single-crystal-nickel, we have used ‘Hyperdynamics’ to achieve the applied strain rate of 10^4/s. We will comparatively show the change in prediction of deformation mechanism and evolution of different state variables which are responsible for crack tip, under both high (10^7/s) and low (10^4/s) strain rate.
||Planned: A print-only volume