Fixing interferences issues

Altair Forum User

Hi all, 

 

I'm performing a dynamic simulation using RADIOSS solver. 

 

I'm creating this kind of model :

 

I used a COMPSH material law and an SH_ORTH property in order to model an 'equivalent material', with a 4 mm thickness.

 

When I run the analysis, I've issues regarding penetrations in my model. Nevertheless, when I want to fix them using the Penetration Check tool, elems are totaly deformed.

 

Could you please help me with this model ?

 

Best regards, 

Raphael

 

Altair Forum User

Hi,

Please check the interface parameters you have used, especially the Gapmin value. The best is to specify a small Gapmin value.

Which interface you are using, if type 7 use the recommended parameters.

Also let me know whether you are trying for a self interface.

 

Altair Forum User

Hi George,

 

Yes I'm using a type 7 interface with recommended parameters :

Istf=4

IGap=2

INACTI=6

Fric=0.1

Gapmin=0.1

 

So, do you mean that I've to increase GapMin parameter? How can I determine the good value ?

 

I'm especially trying to stimulate this object impacting a rigid walk. I built this model using only 1 component, and I want to model the contact of this component itself. Am I in the good way ?

 

Thanks

Raphael

Altair Forum User

Hi,

You can try reducing the Gapmin value. Also instead of Type 7 you can try modelling it with Type 24 interface also.

Please share the model file if the issue persist.

Altair Forum User

I'll try right now this kind of interface.

 

Do I have to try with the same parameters than Type 7 ?

Altair Forum User

Hi George, 

 

I tried with Type 7 and Type 24, and it still doesn't work.

 

When I start the calculation, I always have a warning regarding initial penetration.

 

Also, please find attached the concerned model.

 

Thank you for your help

Unable to find an attachment - read this blog

Altair Forum User

Hi,

Modified the contact parameters.

Please try with the model attached.

 

<?xml version="1.0" encoding="UTF-8"?>

Unable to find an attachment - read this blog

Altair Forum User

Hi George, 

 

Thank you very much, the model is running as I wanted !

 

Nevertheless, I've another question. How is it possible to orientate each surface of the model independently ? 

 

Thanks for your support

Raphael