Dear all
I want calculate fracture energy in tensile. for this i must calculate cohesive
energy.
How do i calculate this?
I don't know. Find a paper that explains it?
Steve
Hamed - this is a list about LAMMPS. Not really for general “physics” questions. When you ask a question here, relate it to LAMMPS and you’ll get helpful responses.
W/r to calculating fracture energy, it seems (from your question) you’re not quite sure what you’re doing quite yet. For example, you do not need to know “cohesive energy”, by which I assume you mean the areal energy density to create a new (fracture) surface, to calculate fracture energy - indeed, one can often estimate the former from a measurement of the latter. Usually it’s best to physically understand the systems you’re studying a bit more before diving into simulations, or at least to have a “local expert” to talk to.
Best,
Rob
If that's what it is, then you could build 2 simple LAMMPS models.
One that is bulk periodic, one with a free surface. Relax them
both, look at the potential energy, the difference (suitably normalized)
would be the energy of the surface.
Steve