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Experience with Substructures?

Experience with Substructures?

Experience with Substructures?

(OP)
Hi,

I've gone through the docs and I've understood what substructures are about and how they are (theoretically) done. However, in practice, I'm having all sorts of troubles.

I was wondering if someone has an instruction/procedure for a hussle free implementation of substructures.

Something along the lines:
- create a CAE model as any other
- put nodes that you wish to retain in a set
- ...
- write an input file
- edit the step
- ...

My biggest problem is how to position element nodes at the usage level. For instance, I have a 3D beam (a proper 3D structure, not a wire) and I want to replace the middle of the beam with an equivalent substructure i.e a direct replacement

======================  <-- this to become

===={substructure}====  <-- something like that

The retained DOFs are all DOFs of all nodes accross the cross-section.

How could this be done?

The way I've done it results in a warning that goes for every node I've used to attache the substructure and no load gets trasmitted to and from the substructure.

The warning is:
 ***WARNING: THE COORDINATES DUE TO *SUBSTRUCTURE PROPERTY ARE OUTSIDE SPECIFIED TOLERANCES FOR ELEMENT

Thanks

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