Sign convention of CBUSH forces
Sign convention of CBUSH forces
(OP)
I have obtained the forces of a set of CBUSH elements with the ELFORCE output command. What I'm now wondering about: what exactly determines whether a force component is positive or negative?
I have the feeling that the answer will be quite trivial, but thus far I haven't been able to fully figure it out yet. If anyone could provide some insight I'd very grateful!
I have the feeling that the answer will be quite trivial, but thus far I haven't been able to fully figure it out yet. If anyone could provide some insight I'd very grateful!





RE: Sign convention of CBUSH forces
RE: Sign convention of CBUSH forces
RE: Sign convention of CBUSH forces
RE: Sign convention of CBUSH forces
RE: Sign convention of CBUSH forces
Rule 1) The direction of the coordinate axis should align with the direction from "Grid A to Grid B" of the bush element.
Rule 2) The "positive" direction of your coordinate system (for tension/compression direction - also known as: fastener axial coordinate) should "first meet" the plate which belongs to Grid A.
In the below snapshot, I also added the vice-versa cases. This should cover everything. You may also add RBE2/RBAR elements to the Grids in case you have geometrical offset between your bush and plate nodes.