Hi my friends!
Can I use :
fix 1 all deform 1 y erate 0.01 units box
and for computing strain use Almansi formula:
variable strain equal "0.5*((((ly)^2) - ((v_L0)^2))/((ly)^2))"
with Almansi formula strain will be obtained less than 0.01 in each step & does not correspond to fix command!
I have to use Almansi strain because I work on large deformation!