HIGH CONTACT ENERGY FOR SINGLE SURFACE CONTACT

Altair Forum User

DEar sir, i was perfomimg impavt analysis using single surface contact and the problem i have been facing is the contact energy is very high from the start of the run as shown in pics below, later i used the parameters u have suggested in forum, it have been decreased but very slightly, i want to reduce it to below 10% and also i want to know why its happening like that. please check the images for further clarifications. SEcond one is having high ontact energy even though i have followed the parameters you have suggested in forums that is for self contact gapmin= 0.001. PLese hlep me to solve this.

Thank you

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Altair Forum User

Hi Ramakiran,

Please check the interface for any penetrations. If any penetrations are there please remove the same.

The other checks for high contact energy are:

 • Set recommended parameter for the contact definition.

   Suggested parameters for Type 7 contact are 

          Istf=4

          Igap=2

          Fscale_Gap=0.8

          INACTI=6

          Gap_min=

          Fric = 0.1

          Iform=2

 • Set “physical” contact interface gap value. Slightly increase the Gapmin value also.

If friction value is provided in the interface, please remove the same, try running and review the contact energy results.

Altair Forum User

thank you sir, i am using single surface contact, what should be the physical gap value, as i used 0.001 for self contact and there are no penetrations for single surface contact type 7 and i used the same parameters prescribed by you and still the graph looks same.

Altair Forum User

Hi Ramakiran,

Please share the model file through the secure dropbox, so that we will review the model.

Altair Forum User

Hi Ramakiran,

The updated files has been sent to you.

Altair Forum User

Thank you sir, cleared the problem and its working fine.