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# Periodic Boundary Conditions

## Periodic Boundary Conditions

(OP)
Hi,

Can anyone explain how to apply periodic boundary conditions to a unit cell model in Abaqus. I understand how the unit cell should deform but don't know how to apply the conditions. I think it should be done using the *equation keyword. Any suggestions would be appreciated.

### RE: Periodic Boundary Conditions

Check out the following reference:
O. van der Sluis, P.J.G. Schreurs, W.A.M. Brekelmans, H.E.H. Meijer, Mechanics of Materials 32 (2000), 449-462.

Yes. You need to use *Equation keyword. Create an input file using any text editor with all the required equations. Go to 'Model-edit keywords' and add a line pointing to the file using *Equation, INPUT=filename.

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