the equation you want is LU=RU+constant. You have effectively set the constant to zero -- so not allowing 'poisson' expansion.
To use this approach your equation will have 4 terms,
L17,1,1.,R17,1,-1.,L1,1,-1.,R1,1,1.
where the 'master' node pair (1) appears in every equation.
note I may have mixed up the signs but if you see how it works you should figure it out.
--- In
Abaqus@..., Gouse <gouse_wiz@...> wrote:
>
>
> Dear All,
>
> I am trying to simulate mechanical behaviour of a concrete unit cell for
> uniaxial compression laoding. I have apllied periodic bounadary conditions
> on both lateral edges using linear equation option available in ABAQUS where
> as on top and bottom edges load is apllied. Deformed structure shows there
> is no lateral deformation and unit cell behaves as if it is confined
> laterally on both sides. I am confused about my boundary conditions whether
> they are correct or not.
>
> Equation used to aplly periodic bounadary condition are
>
> ** Constraint: Constraint-18
> *Equation
> 2
> R17, 1, 1.
> L17, 1, -1.
>
> where R17 and L17 are nodes on the right and left of the unit cell.
>
> The above eqn I could use from your earlier suggestion but
>
> Can any body suggest what exactly I should use for my unit cell. Unit cell
> is a plane square with a circular inclusion at the centre.
>
> Regards
>
> Gouse
>
> --
> View this message in context:
http://www.nabble.com/Periodic-Boundary-Conditions-for-uniaxial-compression-tp24318476p24318476.html> Sent from the Abaqus Users mailing list archive at Nabble.com.
>
