Hi All,
I am trying to simulate crack propagation by pulling in y direction by applying following commands:
velocity btop set 0.0 0.06 0.0 units box
velocity bbot set 0.0 -0.06 0.0 units box
velocity mobile ramp vy -0.06 0.06 y 4.05 121.5 sum yes units box
fix 1 all nve
fix 2 boundary setforce 0.0 0.0 0.0
Above commands are for tensile loading. I have also applied a temp control on velocities only in x and z direction.
My questions are:
- What effect command should have on defect nucleation if I use
fix 2 boundary setforce NULL 0.0 NULL
instead of
fix 2 boundary setforce 0.0 0.0 0.0 (like above)
- Which is the better choice to use.
fix 2 boundary setforce 0.0 0.0 0.0
or
fix 2 boundary setforce NULL 0.0 NULL
- Does for applying Compressive loading one just needs to reverse the sign of velocity like -
velocity mobile ramp vy 0.06 -0.06 y 4.05 121.5 sum yes units box
Any response is deeply appreciated.
Thanks
Poornima
NCSU