Modelling polymer chain of spheres with infinitly strong (unbreakable) bonds.

Good day every one. Can I model using LAMMPS polymer chain consisting of ten spheres (diameter of each sphere is 350 Angstrems) with infinite strong bonds (unbreakable) with constant length of 350A? That bond type should I use?
Is the LAMMPS suitable for such task?

Good day every one. Can I model using LAMMPS polymer chain consisting of ten
spheres (diameter of each sphere is 350 Angstrems) with infinite strong
bonds (unbreakable) with constant length of 350A? That bond type should I
use?
Is the LAMMPS suitable for such task?

yes and no. it depends on what you mean by "constant length".
you can model spherical objects with either regular lennard-jones or
colloid potential and string them together with harmonic bonds (which
don't break).
however, you cannot have those bonds perfectly constrained to the same
fixed length using fix shake, as that would create connected clusters,
which fix shake does not support.
you can make those harmonic bonds arbitrarily stiff, though.

axel.