10.25950/E62BB99E
Yichen Qian and Nicolas Bertin and Daniel Karls and Yaser Afshar and Vasily Bulatov and Ellad B. Tadmor and David Cereceda
Dislocation core energy for cubic crystals at a set of dislocation core cutoff radii v000
OpenKIM
2020
Software
OpenKIM
Test Driver
TD_452950666597_000
Yichen Qian
OpenKIM
2020
TD_452950666597_000
DislocationCoreEnergyCubic__TD_452950666597_000
https://openkim.org/cite/TD_452950666597_000
This Test Driver computes the dislocation core energy of a cubic crystal at zero temperature and a given stress state for a specified dislocation core cut-off radius. First, it generates several periodic atomistic supercells containing a dislocation dipole. The dipole distance of these supercells range from 10*c1 to 50*c1, where c1 is one of the unit vectors in the periodic supercell. After obtaining the total energy of the system from conjugate gradient minimizations, non-singular elasticity is applied to obtain the dislocation core energy for each of these supercells with different dipole distances. Finally, after checking the independence of the results from the simulation cell geometry, the dislocation core energy is determined for a given dislocation core radius.
NOTE: Currently this driver is limited to crystals that are approximately isotropic, and has only been tested for bcc crystals thus far.