Learning Forum

[detboss]

Dear Forum,
I have a problem/question about my project where I am looking at a brake disk that heats up and due to the heating there is a change in the coefficient of friction. I found an APDL on the Ansys help page that describes a change in the coefficient of friction when the temperature changes. (See picture)

In the next picture you can see the project and the quarter disk I am looking at. Under the point "Contact" you can see the contact regions 2 and 5, which describe the contact of the disk with the break pads. My question now is where do I have to insert the APDL (as shown above) in order to start a simulation in which the friction changes as a function of the temperature? Do I have to create a separate APDL for each contact region, or where do I insert the APDL with its values? Unfortunately I could not find anything on the Ansys help page. 
Thanks for your help
Best regards
Daniel

[Erik Kostson]

 

 

Hi you can add it (APDL command snippet) under the contact (as done here - https://innovationspace.ansys.com/forum/forums/topic/contact-pair-command-object/) –

below is an example based on your question - change friction values and temps, as needed.

TB,FRIC,cid,2,,ISO     ! Activate isotropic friction model
TBTEMP,0.0         ! Define first temperature
TBDATA,1,0.0          ! Define coefficient of friction at temp 0
TBTEMP,100.0         ! Define second temperature
TBDATA,1,0.2          ! Define coefficient of friction at temp 100

TB,FRIC,tid,2,,ISO     ! Activate isotropic friction model
TBTEMP,0.0         ! Define first temperature
TBDATA,1,0.0          ! Define coefficient of friction at temp 0
TBTEMP,100.0         ! Define second temperature
TBDATA,1,0.2          ! Define coefficient of friction at temp 100.0

 

 

[detboss]

Dear Erik,

Thanks for your help! When I tried to implement the APDL I had another problem. As the links shows, I tried to implement the APDL under "contact region" with worked out pretty well. I created two APDLs for each contact region. 
I have (contact region 2 and contact region 5). Is it correct that the script for CID is the APDL for the contact side and the part with TID is for the target side, so that I can make APDLs for different materials for each contact material?

Another big question I am facing is that I also have the folder named "non linear" where I have defined a friction coefficient and also I have integrated another APDL where I have defined how much heat goes into which part of my break (in my case 50% into the break disk and 50% into the break pad) - see in the pictures below. As you can see, I also have to enter a friction coefficient, which I had set to 0.4. But this seems wrong when I already have the friction APDL as you gave me. Do I need to delete the "non-linear" folder, or will this not affect my simulation because of the APDL I have created in the "contact region 2 and 5" part?

Thanks for your help!

Best regards

Daniel