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"Tie Constraint" in fenics solid mechanics

+1 vote

Dear all,

I am migrating from ABAQUS (primarily because the university decided to not buy the licenses any more). I am more of an analyst than a developer so please bear with me. I was working on a model that is basically a disk with a small wedge cut off. For those of you familiar with defects, this is a wedge disclination. I am trying to compute the elastic strain energy in the disclination defect. In ABAQUS, the following steps were performed:
1) Join the two edges of the model with displacement boundary conditions
2) Apply a "tie" constraint (i.e. join the edges as if they are bonded together)
3) Equilibrate after applying the "tie" constraint.

I was wondering if such a constraint exists in the fenics package. Calculix (another open-source FEA suite), for example, has this capability tie. I would like to make sure if such constraints exist in fenics before embarking on completely adapting my files for fenics analysis. Any help is much appreciated.

Thank you,
-Sri

asked Jan 8, 2014 by spatala FEniCS Novice (160 points)
edited Jan 8, 2014 by johanhake

1 Answer

+1 vote
 
Best answer

The DOLFIN code that is used for periodic boundary conditions can be generalised to support ties. It hasn't been done yet (just a question of demand), but will be reasonably straightforward.

answered Jan 13, 2014 by Garth N. Wells FEniCS Expert (35,930 points)
selected Jan 13, 2014 by spatala
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