I'm learning applying periodic boundary conditions in Abaqus and I've found it's very difficult to define *Equation constraints directly in Abaqus because there are so many nodes on opposite faces. One may develop a Fortran program which can generate all constraints automatically. Could someone who has this kind of experience give me an example? Maybe Abaqus has provided users some good way, if so, please tell me.
I think that will be a big favor for me, thanks!