I am doing an Advanced Nonlinear Simulation (601,106). I simulate the behavior of a honey-comb-like core when the face sheets come from both sides with some pressure. The contacts work fine and the reaction forces on the face sheets can be evaluated. Now I would like to have gluing in the areas of contact, so I can go on and give some load on the sandwich structure.
As the solution 601,106 doesn’t use (or doesn’t allow) subcases, I have to control everything with the time steps. Turning on and off the contact elements (TBIRTH and TDEATH) works fine. Actually before I come up with the face sheets, I have a step which simulates the expansion of the honey comb. Now I noticed that the gluing contacts cannot be turned on and off like contacts.
Thanks for ideas!
Solved! Go to Solution.
You can use tied contact (TIED=1 on BCTPARA) rather than glue and use TBIRTH/TDEATH to control these.
thank you for the hint. I just copy the face contacts that I need. The originals just do regular contact, for example from 0 to 50s. Then I take the copy with the TIED option and have it turned on from 50s to 100s. That all works fine. Thanx!
Now I have a new question. How can I turn on an off "User defined Constraints". In some cases I might be able to use "Enforced Displacement Constraints" as workaround by defining specific fields, but thats is not very handy and not working in all the cases. In my case: after expanding the honeycomb and assembling the sandwich I want to bend it with a new load.
You cannot change constraints in the course of an analysis. However, you can copy the node that you want to constrain, create a rigid element between the original node and the copied node, then apply the constraint to the copied node. You can then use element birth/death to retain or remove the rigid link. Removing the link effectively removes the constraint from the structure.