Why when I create a contact with friction, the two bodies act like if they are glued even in traction.

Riccardo Biasi_22129

I am working on a project where there is a pin inside a hole that is pilled.

Everything seems working well, except for the auto contact function. 

As you can see on the photos i posted in this question, in a normal case, on an hole there should be a deformation that cause a detachment of the pin with the hole. In my simulation that doesn't happen.

Even in the base of the component, were there is a simple friction contact, the two parts act as if they were glued.

Thanks for your attention.

Rajashri_Saha

Hi Riccardo,

I just went through your model and found that your analysis is Linear static. In this case even if you defined Frictional contact, it will be treated as TIE or bonded contact by the solver. Contact status will not change. So, if you are looking for contact deformation and all you should run the analysis as Nonlinear static. 

Thanks

Rajashri

Riccardo Biasi_22129

Rajashri Saha_20525 said:

Hi Riccardo,

I just went through your model and found that your analysis is Linear static. In this case even if you defined Frictional contact, it will be treated as TIE or bonded contact by the solver. Contact status will not change. So, if you are looking for contact deformation and all you should run the analysis as Nonlinear static. 

Thanks

Rajashri

Hello,
thank you for your advise.
When I start the non linear analysis i have the error:

*** ERROR # 1458 *** in the input data:
 One of following cards must be used in this subcase:
     NLPARM, NLCTRL.

I know that this is a normal thing because for Non linear i have to put some other information on the type of analysis but do you have any advise on how to do it and which is the best way to do it?

Thanks you very much

Riccardo

Rajashri_Saha

Riccardo Biasi_22129 said:

Hello,
thank you for your advise.
When I start the non linear analysis i have the error:

*** ERROR # 1458 *** in the input data:
 One of following cards must be used in this subcase:
     NLPARM, NLCTRL.

I know that this is a normal thing because for Non linear i have to put some other information on the type of analysis but do you have any advise on how to do it and which is the best way to do it?

Thanks you very much

Riccardo

Yes, For non linear analysis you need to add NLPARM card.

You can refer the below tutorial for more information.

OS-T: 1365 NLSTAT Analysis of Solid Blocks in Contact (altair.com)

This tutorial includes Nonlinear material too which is not required in your case. You can take into account only contact Nonlinearity.

Thanks

Rajashri