Investigation of crack tip dislocation emission in aluminum using multiscale molecular dynamics simulation and continuum modeling

摘要: This work investigates the dislocation nucleation processes that occur at tip of a crack in aluminum under broad range crystallographic orientations and temperatures. A concurrent multiscale molecular dynamics - continuum simulation framework is employed. The results are then interpreted using Peierls model uses finite temperature material properties derived from simulation. Under ramped loading, partial found to lead both full emission twinning, depending upon orientation, temperature, magnitude applied load origins dependencies made apparent by model. suggests many instances can be considered strain rate independent process, yet still dependent through dependence stacking fault energies elastic constants. (C) 2013 Elsevier Ltd. All rights reserved.