[lammps-users] preparing specimen

Hi all,
I have two solid bodies and want to glue them. So, essentially I have to define the strength between two bodies. How may I prepare this kind of specimen? Has anybody worked like this? Pleas help.

Thanks and Regards,

Sandip Haldar

Hi all,

I have two solid bodies and want to glue them. So, essentially I
have to define the strength between two bodies. How may I prepare
this kind of specimen? Has anybody worked like this? Pleas help.

sandip,

you have to provide a little more information about what you want to
do with those two bodies and what properties you want to compute from
that. right now, from how i interpret your description, you might just
model this with a regular (harmonic) bond interaction with an
appropriately stiff force constant. it will become a little more
complicated if you want allow those bodies to become 'unglued'.

cheers,
   axel.

Thanks Axel for your reply.
Actually I wanted to simulate crack propagation. Hence it implies the unglueing of the bodies as you mentioned.
I also want to embed a crack in between two bodies and propagate it. The properties I'll look for are crack opening at a time, crack length etc.

Thanks,
Sandip

*** sandip,

You don't have to bond atoms to see cracks. Pair potentials are
attractive (at least for solids), so if you pull on them, they will
crack. The only breakable bond currently in LAMMPS is style
quartic, which you wouldn't want to use for most materials.

Steve