fix deform for uniaxial tensile test

Hi all,

For doing a tensile test on a periodic graphene sheet (periodic x and y directions), I want to use the fix deform command. This is a test for my real systems later.
However, the system does not stretch along the x direction, and the box changes its size a bit along the z direction (perpendicular to the sheet).

What should I modify in my commands? The input file is as follows. Thanks.

Try using a simpler option than erate with fix deform x,

to see if you can get the box to change and verify

that you can visualize it correctly.