Rotational displacement BC problems
Rotational displacement BC problems
(OP)
Hi all,
I am trying to apply a rotational displacement to a wheel which has been sectioned into 1/4. I have modeled this before so i know its possible, my issue is that it will not work again even with the same BC's etc. I basically have 1/4 of an alloy wheel with the outside rim surface fixed (to simply model tyre traction)then i apply a rotational displacement BC of 0.0175 radian (1 degree) to the inside surface which would contact the brake disc. I ran this simulation before as a proof of concept just before a meeting and did not manage to save it as i assumed it could be model very quickly again (it only took me 2 minutes to set up originally). Now when i try to run the simulation again it tells me in ABAQUS that the 'Degree of freedom 6 is not active in this model'. I know that 3D elements cannot be rotated but im not trying to rotate the elements just translate them about the z-axis. I have attached the images of the errors and the screens of my original simulation that i want to replicate.


I am trying to apply a rotational displacement to a wheel which has been sectioned into 1/4. I have modeled this before so i know its possible, my issue is that it will not work again even with the same BC's etc. I basically have 1/4 of an alloy wheel with the outside rim surface fixed (to simply model tyre traction)then i apply a rotational displacement BC of 0.0175 radian (1 degree) to the inside surface which would contact the brake disc. I ran this simulation before as a proof of concept just before a meeting and did not manage to save it as i assumed it could be model very quickly again (it only took me 2 minutes to set up originally). Now when i try to run the simulation again it tells me in ABAQUS that the 'Degree of freedom 6 is not active in this model'. I know that 3D elements cannot be rotated but im not trying to rotate the elements just translate them about the z-axis. I have attached the images of the errors and the screens of my original simulation that i want to replicate.







RE: Rotational displacement BC problems
RE: Rotational displacement BC problems
If rotation is what you want to assign to those elements:
Use Kinematic Coupling constraint between a node and nodes on the surface of interest. Then, apply this rotational boundary condition to that node.
If you want to translate the nodes along axis 3:
Use U3.
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083
RE: Rotational displacement BC problems
RE: Rotational displacement BC problems
RE: Rotational displacement BC problems
What you want to do is rotate the elements (not the nodes on those elements) on the surface around U3. You should use kinematic coupling between a reference node and the nodes on the surfaces of interest. And then apply UR3 to that reference node.
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083
RE: Rotational displacement BC problems
Do i select UR3 since this is the degree of freedom that i was the rest of the nodes to copy?
Then select the ref node again to apply the rotation
Thanks for all your help, this is for a final year project and iv never used ABAQUS to this extent before.
RE: Rotational displacement BC problems
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083
RE: Rotational displacement BC problems
RE: Rotational displacement BC problems
CODE --> CommandPrompt
Depending on the version of your ABAQUS installation, the first keyword may be different. On mine, for example, it is abq611pr3 instead of abaqus.
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083
RE: Rotational displacement BC problems
RE: Rotational displacement BC problems
If you running your model on a networked computer, then your school must have purchased so many licenses.
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083