fix bond orientations

Dear developers and users,
I would like to simulate a system composed of dumbbell, two LJ atoms connected by a bond, in which the orientation of all the bonds is fixed, for example along the z-axis (I need this because I want to apply a deformation in the perpendicular plane).
Is there the possibility in LAMMPS to fix the orientation of a bond?
Thanks a lot,

Cheers

francesco

Dear developers and users,
I would like to simulate a system composed of dumbbell, two LJ atoms
connected by a bond, in which the orientation of all the bonds is fixed, for
example along the z-axis (I need this because I want to apply a deformation
in the perpendicular plane).
Is there the possibility in LAMMPS to fix the orientation of a bond?

i think the only way to achieve this would be using a rigid
integrator, where torque can be removed. normally LAMMPS doesn't know
much about a molecule as an entity. it just sees ton of atoms with
interactions.

axel.