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Instructions:
1. Input the pressure (stress) tensor in the script
2. Input estimated elastic modulus in the script
3. Set ISIF=2 in the INCAR
4. Copy POSCAR to poscar.0
5. Configure mpiexec commands in the script based on your linux environment
6. Use 'qsub $YourJobPath/fixpressure.py' to submit your job

Notes:
This script calculates stress tensor by using vasp program, and adjusts the POSCAR iteratively until the stress tensor converges to the value you want.
The POSCAR adjustment is estimated according to generalized Hooke's law based on elastic modulus you inputted. The iteration algorithm can tolerate certain errors in the modulus, but bad modulus input may lead to a slow convergence.
In order to obtain an accurate stress result, please use a high ECUT. See Vasp manual for details.
You can set ISTART=1 and LWAVE=.T. in the INCAR file, this can accelerate the calculation. However, this may also raise convergence problems when shear stresses are applied. Do your own tests.
Shoule you find any bug, please contact jie.hou2@mail.mcgill.ca.[ Last edited by ä±¾£ on 2017-10-17 at 08:51 ]
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  • 2017-09-30 05:25:27, 89.32 K
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  • 2017-10-17 02:19:47, 127.43 K

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