Centre of gravity
Centre of gravity
(OP)
is there a way nastran can caluclate the centre of gravity for the whole model because i want to apply my loads at this point and i have planar model.Thanks.
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RE: Centre of gravity
If you are using a different flavor of Nastran pre-processor, this is probably useless.
Garland E. Borowski, PE
RE: Centre of gravity
RE: Centre of gravity
Depending on how simple the planar geometry is, you may want to delete the entire mesh, draw the hole in the plane and remesh.
Garland E. Borowski, PE
RE: Centre of gravity
RE: Centre of gravity
Regards
Thomas
RE: Centre of gravity
RE: Centre of gravity
I think you can also (if needed) extrude the second surface to a 3d solid to make sure that it goes entirely trough the first one.
I tried it and it worked just fine for my. I worked with the parasolid engine if that makes any difference. I think that parasolid is the "native" engine within femap.
Good Luck
Thomas
RE: Centre of gravity
Again, I think I'm missing something. It sounds like you have a planar plate lying in 2 dimensions (the x-y plane, perhaps), but that it was modeled as a solid, so your elements are bricks, not quads. If you are, in fact, attempting to create plate elements, then the plate would be a rectangle and the hole would be an interior circle (somewhat like ThomasH described). If you automesh this geometry, 2-D elements will be formed from the rectangle to the circle, but not inside the circle. You then define the thickness in your "property" that is tied to those elements. If you would prefer to turn them into bricks, you can copy the 2-D mesh remembering that you need at least 3 bricks through the thickness to get reasonable results.
Not sure if this rambling answered your question, but hopefully it helps.
Garland
Garland E. Borowski, PE
RE: Centre of gravity
Geometry>curve from surface> project and delete>surface are the commands used for this purpose. Thanks.