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Bad contact interface TYPE 7, node to surface

User: "Altair Forum User"
Altair Employee
Updated by Altair Forum User

Hi ,

 

 

 

I'm doing a contact interface between a surface and a solid. The contact interface /INTER/TYPE 7 is used for the contact node to surface:

 


post-36775-0-81238300-1444987494_thumb.p

 


/INTER/TYPE7/3
pro_yarn
# Slav_id Mast_id Istf Ithe Igap Ibag Idel Icurv Iadm
10 19 0 0 0 0 0 0 0
# Fscalegap GAP_MAX Fpenmax
0 0 0
# Stmin Stmax %mesh_size dtmin Irem_gap
0 0 0 0 0
# Stfac Fric Gapmin Tstart Tstop
0 .2 .014 0 0
# IBC Inacti VisS VisF Bumult
000 0 0 0 0
# Ifric Ifiltr Xfreq Iform sens_ID
0 0 0 0 0

 

The value of Gap_min is choised according to the recommended value of the radioss solver:

 


** WARNING IN INTERFACE GAP
DESCRIPTION :
-- INTERFACE ID : 3
-- INTERFACE TITLE : pro_yarn
INPUT GAP 0.5000000000000E-01
HOWEVER GAP IS RECOMMENDED TO BE LESS THAN 0.1408760900333E-01 

 

The result shows visually a bad contact:

 


post-36775-0-88171500-1444987303_thumb.p

 

 

Can Someone please help me to improve this contact pls?

 

post-36775-0-88171500-1444987303_thumb.p

post-36775-0-81238300-1444987494_thumb.p

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    User: "Rahul Rajan_21763"
    New Altair Community Member
    Updated by Rahul Rajan_21763

    Hi,

     

    Try with Istiff=4 and Inacti=6 for penetration.

     

    Regads

    Rahul R

    User: "Altair Forum User"
    Altair Employee
    OP
    Updated by Altair Forum User

    Hi,

     

    Gapmin is computed based on your Igap choice. If nothing is specified a default value is computed as minmum,.

     

    From your warning message, change the gapmin to 0.14e-1 and try again.