Penetration

Altair Forum User

i am doing roll over analysis of a small model of a bus.in my model intially there is no penetrations.after running the analysis there is some penetrations and intersections.i have made type 7 interface. basically i want to know whether it will affect  final results?what are its effect on energy balancing?

gopal_rathore

Hi,

Yes, it might effect the results. If intersections are happening, it means no contact is detected at those locations and thus no load transfer and if observed critical joint location, results would be certainly effected. it is important to have no intersections in model overall and more focus in critical locations.

If penetration is observed you can check the contact energy if it is low it can be taken as it is and also if you can use InActi6 in type 7 interface, initial penetrations will be removed 

Overall it it is recommended to have no penetration and intersection to obtain correct physical behaviour.

Altair Forum User

Hi Raju,

Ensure that interfaces are properly defined between the components. These intersections/penetrations will affect the model behavior.

Try with the recommended contact parameters as below for interface Type 7:

Istf=4

Igap=2

Fscale_Gap=0.8

INACTI=6

Gap_min=0.1

Fric = 0.1

Iform=2

 

Altair Forum User

how to remove penetration in model ?

Altair Forum User

Hi,

In HyperMesh, go to Tools>Penetration and check the model for any penetrations. You can manually or automatically fix them. Please refer  HM-3320 tutorial in Help Menu which shows the steps.

Also, please go through the below post which introduces a new tool in HyperWorks 2017, called collision detection tool which can fix penetrations.