ansys designspace question

[vscid]

Hi,
In the options for the contact region type, I find bonded, frictionless etc. What are they and whats the difference between them? I tried using all of them, but none seemed different than the other in my results.
Tnx!

 

[Badri07]

Hi,

I am afraid you have not explained your problem clearly and what you are trying to achieve through the analysis.
when you make bonded contact and no separation you are making the contacts linear,and frictionless and rough are nonlinear contacts.

you should try to use one of these contacts based on your problem.

Badri07.

 

[gurmeet2003]

vsicd,
You can find this information in the help file. But here is the basic definition:
Bonded: this is same as glueing two parts togather. No relative motion (sliding or separation)is allowed.
No sepearation: Parts can slide wrt one another but they can not separate.
Frictionless: Parts can slide and separate. But no friction between the contacting surfaces is considered.
Rough: Spearation is allowed, but no sliding. This is the case of infinite friction.

Which one to use? Depends on the physcial model. What is closest to the physcial reality you are trying to model? If you do not know. Try moving up the complexity scale. When one level up does not change the results it means you have reached your target. In general the results near the contact change depending on the type of contact. However if in your case you do not see any difference, it means that you need only a bonded contact.

Gurmeet.

 

[vscid]

Gurmeet,
Can you give me examples for each one?

 

[gurmeet2003]

vscid,

To give an example of a sliding joint, consider a gasketed joint. If you are trying to analyze the gasket or the joint you would like to use a sliding jointi.e.; no separation or frictionless. However if this joint is only a part of your model and your interest lies in other part of the model, you could do with a bonded joint. Run times between bonded and no separation are not very different, but a frictionless joint runs slower. Personally I have never had to use a rough joint.

Gurmeet