Bad contact interface TYPE 7, node to surface

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:

 

 

 /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:

 

 

 

Can Someone please help me to improve this contact pls?

 

Rahul Rajan_21763

Hi,

 

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

 

Regads

Rahul R

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.