Beam self-contact

ivanIEV

Hallo everybody,

I am trying to simulate spring(modelled via beam3N elements). During simulation, spring should have a lot of contact points with itself and it has in a fact, but the cross-section of beam elements isn't accounted. In another words there are contacts between points of helix(middle line). Does anybody know this problem? I am using contact type 11. 

Regards,

Ivan

Altair Forum User

Hi,

 

Can you share a picture of the problem you are facing with, please?

ivanIEV

Pictures are in attachment

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Simon Križnik

Hi Ivan,

 

contact detection is defined by Igap parameter. In your case you could use Igap=1000 constant gap equal to Gapmin=beam diameter.

 

But this could be problematic if the second image shows initial configuration with a lot of initial penetrations. Those could be handled by Inacti=5 or 6.

 

If the second image shows the deformed configuration with deep penetrations, then increase the contact stiffness by increasing parameters:

-Gapmin

- Stfac

ivanIEV

Hi Ivan,

yes, it is:

Altair Forum User said:

If the second image shows the deformed configuration

I found solution, it is simple and stupid/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />  Length of my beam elements was smaller than diameter,  so solver understood Gapmin not correct from the start...

Thank you for support!

 

Simon Križnik

Hi,

 

I am glad you have solved the issue. Care to share the method used to manage it?