Boundary conditions
Boundary conditions
(OP)
I have a question regarding the boundary condition for a plate which is simply supported on all four edges. How do i simulate this condition in a FE software. what i mean is what are the d.o.f that i would have to constrain considering each node has 6 d.o.f..Thanks.





RE: Boundary conditions
Garland E. Borowski, PE
RE: Boundary conditions
As the edges are simply supported no rotational restraints are required.
If you fix all the edges in xyz direction then membrane stresses will be induced which I assume you dont want as you said its simply supported.
RE: Boundary conditions
RE: Boundary conditions
RE: Boundary conditions
Garland E. Borowski, PE
RE: Boundary conditions
Personally, I would only fix one point in xy direction and one other point in x direction.
In large dispacement analysis I think that the edges will try to move towards the centre of the plate, this distance will be greater at the middle of the edges (than at the corners).
RE: Boundary conditions
RE: Boundary conditions
RE: Boundary conditions
Tx=0 (one point)
Tx=0 and Ty=0 (the other point)
You will see that loads in these SPC's are negligible, so your results will be reliable.
RE: Boundary conditions
you are right. One of the replies had restrained on all 4 edges and I did not think about over restraining the edge 4 if you remove extra restrains from the other 3 edges. I guess I was thinking about beam theory not plate.
Thank You
RE: Boundary conditions
RE: Boundary conditions
Does it agree well with the test data?
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Boundary conditions