Why is Contact energy very high in Radioss drop test?

alpha_21885
alpha_21885 Altair Community Member
edited October 2020 in Community Q&A

Hi,

 

I am run very simple FE model (2 solid parts contact) drop test.

I used contact type 7 for contact b/w 2 models and self-contact  (type 7):

- I(stiffness) = 4

- Fric = 0.2

- Gap min = 0.5 >> I am not really clear about the meaning of gap min.

- I frm =2

- Inacti = 5

 

However, the result shows contact energy very high?

Could you share the reason of high contact energy?

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2018

    Hi,

    Please use these parameters:

    Istf=4

    Igap=2

    Fscale_Gap=0.8

    INACTI=6

    Gap_min=

    Fric = 0.1

    Iform=2.

     

    Gapmin is the minimum gap value at which the interface will be activated.

     

    After these parameters are set check the interface for any penetrations and clear if any are present.

    Refer the below post which shows the same:

     

     

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited March 2018

    HI,

    Kindly share some screenshots of energy graph and model Also. Are there any initial penetrations . Is the material same for both parts?

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