Learning Forum

[Jacob Ellis]

I have 4 layers of TSHELLS. They are bonded using *TIED_SURFACE_TO_SURFACE_OFFSET.

Duing deformation the layers are coming apart. I am not using a tiebreak contact so I expected them to stay bonded for all time.

I also have *ERODING_SINGLE_SURFACE defined on these layers since I want elements to be deleted. Are these two contact defintions conflicting? If so, how can I tie the layers and also have them erode?

[Jim Day]

There's no reason to use the penalty-based OFFSET option here. Eliminate the "_OFFSET". Also, I'd define 3 separate tied contacts (since you have 4 layers of tshells) and use segments sets in defining those contacts, specifying only the segments you want to be tied for each contact. I don't think the ERODING contact would interfere, but if the tied contacts still fail, only as an experiment, you could comment out the ERODING contact and see if the ties hold.

[Jim Day]

Any luck? Another thought if you're still having trouble getting the tied contact to tie. If your preprocessor wrote non-default values of contact thickness on Card 3 of *CONTACT_TIED_..., set those variables back to default (blank or zero).