Thanks for your answer dear Adrian,
how can i tuned off all force interactions are turned off between the two slabs? sorry for my questions, i’m not pro
My model is periodic only in y direction and it’s deformed by displacing the fixed columns in the two opposite direction along x direction.
These are my input about making an edge crack ( for a model with geometry of 50nm x 50 nm )
region upper-left block INF 250 400 INF INF INF units box
group upper-left region upper-left
region upper-right block 250 INF 400 INF INF INF units box
group upper-right region upper-right
neigh_modify exclude group upper-right upper-left