Can you provide a simple scheme or picture showing what you want to model ? Are you talking about beams consisting of two layers bonded with adhesive ? What exactly would you like to connect with bushing ?
See original here of problem. I want to know best way to solve with Abacus using connector elements to find bypass and bearing loads in complex joints starting with this one.
Abaqus has fastener elements that can be located anywhere, they do not need to be at node locations. Mesh the plates with shell elements, add the fastener elements at the fastener locations. Bearing loads come directly from the fastener element output.
We model the doubler and skin using B21 elements (3D deformable, linear analysis). Loads and boundary conditions are as applied in the figure
We define a bushing connectors between the doubler and skin at the fastener locations with these properties (spring stiffness 159565.98 lbf/in - inverse of Swift fastener flexibility).
These are the results for the fastener bearing loads and they are way off
BB -
Hmm, that looks odd.
I would have modeled the straps with plate/shell elements, rather than beams, but it still should work with beams.
I would have also put several nodes between each fastener and between the end fasteners and bc's and loads.
I would also make the nodes coincident, rather than offset. It is strange that the bottom picture seems to show bending. Must be due to the node offsets.
Are the two straps the same material/thickness? If not, I would start with identical straps, and then the end fastener loads should be exactly the same.
The beams have cross section just like a shell and will exhibit the same stiffness. If using MyStran bushing it makes sense to put the plates coincident as the bush element in Mystran is a 1D spring acting in the X direction. This bushing is 3D. The straps are 0.04 and 0.05 inches. More elements will not make a difference.
