Tensile test on Al 7075 alloy

Dear Lammps users
I’m modeling a tensile test on aluminum 7075 alloys and trying to verify the model by comparing it with results found in the literature, but the results are not matching
My question is, could the total number of atoms produce the inconsistency in the results? As my model has more atoms than the one in literature
And if yes, how can I change the number of atoms in model?
I have created the atoms as per the command below

lattice fcc 4.05

region whole block 0 20 0 20 0 20 units lattice side in

create_box 4 whole

lattice fcc 4.05 orient x 1 0 0 orient y 0 1 0 orient z 0 0 1

create_atoms 1 region whole

region inside block 4.05 76.95 4.05 76.95 4.05 76.95

set region inside type/fraction 2 0.005 12345 type/fraction 3 0.036 12345 type/fraction 4 0.015 12345

Isra Al Muscati

Dear Lammps users

Yes, the size of your system can affect your results. Usually smaller systems will have larger fluctuations in pressure and temperature while the opposite is true of larger systems.

For changing the size of your system, I believe you just change the size of the region and then the create_atoms command fills that region with atoms. So a smaller region will have fewer atoms than a larger region.

Best Regards,