Pre-stressed modal analysis: Adding additional supports in between structural and modal solves

Yes it should be.

If you are using WB then you need though to add command snippet for the restrain that will be done with the D apdl command.

Med venlige hilsen

EPK

According to the Workbench documentation it can’t be done but, as it often happens, GUI limitations may be omitted by editing the code manually. Before you try with you complicated model I suggest simple test on a beam for example.

Thanks Erik.

I was hoping there would be a more WB friendly way of doing it, but i guess i will look into how to use the APDL command within WB.

Best regards,
Mikael

No worries. For the command snippet first create a nodal named selection (called say FIXNODES) of the nodes and then use the D command, say:

CMSEL,S,FIXNODES ! This selects the nodes
D,ALL,UX,0 ! Fix X for sel. nodes
D,ALL,UY,0
D,ALL,UZ,0

ALLSEL,ALL ! Selects all nodes again

From an Fea point of view it is fine, since the static analysis generates the geometric stiffness matrix which is added to the standard global matrix and then the BC are just changed (so dof will be condensed out form the global matrix). Try it out on a simple model.

@ FEA way - please if you are not really sure about this do not provide help (unless you have a long exp. in Ansys which I cannot see in this forum) - because if advice is not correct things can go wrong!

@Erik Panos Kostson I just said that in Workbench it can’t be done without code modifications and to try with simple example first. Nothing incorrect or uncertain here since you basically confirmed that some code lines must be added and provided them to the OP.

Sure, but in general I would advice to be careful with advice (including myself, when I am not sure I will write it out and advice to seek further advice say from a person that knows the subject), and a lot of referencing, especially when not sure.

Yoy’re right. That’s why I always try to give advices only to the safe extent not to confuse the reader. And in case of FEA software I always recommend reading the appropriate documentation chapters since they are usually very comprehensive and helpful. At least in case of Abaqus. This software made me develop the habit of using and advising the use of documentation. Ansys seems to have nice manuals too so I refer to them sometimes.