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[lammps-users] mobility of screw dislocation
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[lammps-users] mobility of screw dislocation


From: mehrdad zamzamian <mehrdad.zamzamian@...24...>
Date: Sun, 13 May 2018 15:29:50 +0430

Hi all LAMMPS users
i have some problem with mobility of screw dislocation simulation . i created the box containing screw dislocation correctly with orientation X=[111] Y=[-1-12] Z=[1-10] which means the dislocation will move in y direction. but when i apply stress in x direction to box (rendering shear stress to box) the dislocation moves in both x and z direction (such a diagonal way and also box is collapsed). I applied the stress 100Mpa (force is correct) by: # boundary conditions fix 1 upper setforce 0 0 NULL fix 2 lower setforce 0 0 NULL fix 3 upper aveforce ${appliedforce} 0. 0. fix 4 upper rigid group 1 upper can you please help me where i did wrong? how can i apply shear stress (for example 100 MPa) correctly to the box?
Thanks in advance