|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale III
||W-7: Coupled Atomistic-Continuum Framework of Developing Constitutive Relations of Crack Propagation
||Jiaxi Zhang, Subhendu Chakraborty, Somnath Ghosh
|On-Site Speaker (Planned)
Modeling ductile crack propagation in crystalline materials is a challenging enterprise due to complexities induced by the interaction of crack and plasticity. Atomistic simulation tools have been proven to be powerful in investigating various mechanisms in plastic deformation and crack propagation. However computational cost puts strong limitation to both spatial and temporal scale of atomistic studies. In this work, we represent a methodology to investigate crack propagation and cohesive relation using parallel coupled atomistic-continuum methods inspired by early work by Saether etc. The target is to extract the cohesive-type constitutive behavior of crack from the developed coupled model, so that it can be implemented in higher scale FE analysis. We propose a consistency condition that constitutive relation, i.e. the the extracted continuum model having same energy release rate compared with the result from coupled atomistic-continuum model. Under this framework, we further investigate the length scale effect of crack tip field.
||Planned: A print-only volume