Changing Contact from Frictional to Bonded in the same analysis

[Alpete1430]

Hi All,
This might sound lame but however I must ask.

Is there a way to change the Frictional contact to Bonded contact in the same analysis?

I want a frictional contact in Loadstep-1 and after that I want to execute a Bonded contact for the same frictional surfaces for Loadstep-2

Thanks in advance,
Alpete

 

[Erik Panos Kostson]

Never done it but it should be possible. Is it in workbench or apdl?

Make a model with frictional contact in WB say.
In WB insert then an apdl command snippet in the static struct. (A5), and choose to activate it in step 2 (can be done under details of command apdl)

This is added in the snippet:
--
esel,s,type,,cid ! selects contacts
esel,a,type,,tid

KEYMOD,cid,12,3 ! this modifies it to bonded, but you might want to understand the contact keyopts in order to change them better
KEYMOD,tid,12,3

allsel,all
--

 

[AnPham]

you can try with the ACT:

https://www.youtube.com/watch?v=2zJ7tlvPa6o

 

[Erik Panos Kostson]

The act is probably using the above commands. Where did you get this, I have not seen it in the app store? This exists under conditions, and is called contact step control in case you want to use it Alpete

 

[L_K]

In newer versions you could also create two contacts and activate/deactivate them
thus not needing a command snippet.

 

[Erik Panos Kostson]

L_K can you expand and explain how you do that in workbench?

 

[L_K]

They have implemented element birth/death in the workbench:

https://www.youtube.com/watch?v=fA-GYDHd6KI

 

[Alpete1430]

Thank you L_K and Erik,
I'll look into the suggestions provided.

Regards,
Alpete

 

[Erik Panos Kostson]

Great Alpete, let us know if there is anything