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# FEM: 2d analyses with 3d-based code

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## FEM: 2d analyses with 3d-based code

(OP)
Hello!

I have a question regarding some simulations I need to run.
I have a finite element code able to reproduce 3D problems. With this code I would need to run some analyses by considering a 2D body (in order to compare my results with other results on the same examples run with a 2D-based code).

Does anyone have any similar experience? What assumptions have you done? I was thinking of making a very thin third dimension, and apply plane stress / strain conditions (based on the thickness of the real specimen in relation to the other two dimensions).

Many thanks

### RE: FEM: 2d analyses with 3d-based code

If you use a 2D element, you can apply a plane stress or plane strain condition to account for the anticipated behavior in the third dimension.

If you use a 3D element, you do not (can not) apply a plane stress/strain condition to the element. The thickness itself accounts for the behavior in the 3rd dimension.

### RE: FEM: 2d analyses with 3d-based code

and rotational freedoms at each grid.

another day in paradise, or is paradise one day closer ?

### RE: FEM: 2d analyses with 3d-based code

You could use plane strain for finite thickness 3D solid element model, and plane stress for the thin one.

### RE: FEM: 2d analyses with 3d-based code

I think the point was that 3D elements don't consider plane stress/plane strain, but 2D elements do.

another day in paradise, or is paradise one day closer ?

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