Contact Regions In Assy analysis

[mothuproe]

Hi,


My problem is with contact regions while doing analysis in Pro/Mech on an assembly. In my assembly, different parts' surfaces are in contact. Do i need to modelcontact regions between the contacting surfaces? With out contact regions, the assembly is acting as a single body.


I did with and without contact region modelled between the surfaces. The results were different. Which way is correct and gives good results?


Please help me on this.


Thanks


Srik

 

[ghareeb98]

Srik, You have to decide based on the following two scenarios:



1-If the parts are not welded or rigidly connected to each other:

1.A-use interface connections between them, to allow relative movement
(deformation) between the parts without the complications of a contact
analysis.

1.B-If you need to know the stresses and deformations at the point
(surface) of contact, then you'll need to have contact regions defined.




2-The parts are welded or rigidly connected:

Assemble the components in the model using a Mate constraint and don't use interface or contact connections



I hope this helps.

 

[mothuproe]

Ghareeb98,


Thanks for your reply.


That helps.


Srikanth

 

[mothuproe]

Ghareeb98,


I want the surfaces to be individual (not rigidly connected and welded).


I did with interface between 2 contacting surfaces. The two surfaces are acting separate. But the problem is they are penetrating. If the load is applied on one body, it is going through the other as if the second body were not there.


When i tried with contact regions between the surfaces, without penetration, the first body was pushing the other body causing deflection in that too. This is makes sense.


My question: CAN CONTACT REGIONS DEFINITION GIVES GOOD RESULTS?


IS THERE ANY WAY TO MAKE SURFACES NOT TO PENETRATE WHEN INTERFACE IS DEFINED?


Thanks in advance.


Srikanth

 

[ghareeb98]

"My question: CAN CONTACT REGIONS DEFINITION GIVES GOOD RESULTS?"

Yes, absolutely. Provided that you have a fine enough mesh in the
contact region and both stress and strain energy values do converge.





"IS THERE ANY WAY TO MAKE SURFACES NOT TO PENETRATE WHEN INTERFACE IS DEFINED?"

On this issue, I'm not sure, but I doubt it.