Node deactivated from interface

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

Hello,

 

I use Radioss for a dynamic impact problem, but also for the moment to validate my model through a quasi-static analysis.

 

A first component compresses a second component with an imposed velocity. The interface between them is of type 7. In dynamic explicit simulation the interface works fine but in the implicit simulation, I get a warning in interface : 'NODE ... DE-ACTIVATED FROM INTERFACE'. If I make an 'initial penetration' (initial gap < gapmin entered into type 7 interface) I do not get this problem (however I get initial constraints I want to avoid).

 

Would anyone know what the problem might be ?

 

Hereunder a part of my engine.out file:

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

 CYCLE    TIME      TIME-STEP  ELEMENT          ERROR  I-ENERGY    K-ENERGY T  K-ENERGY R  EXT-WORK MAS.ERR
     0   0.000      0.2000E+05 SOLID      39426   0.0%   0.000       0.000       0.000       0.000       0.000    
     ANIMATION FILE: pression_statique_07A001 WRITTEN
  ***** WARNING : ELEMENT FORMULATION ISOLID=    0
     IS NOT AVAILABLE FOR STIFFNESS MATRIX BUILDING, USING GENERIC ONE INSTEAD
      POSSIBLE CONVERGING ISSUE. *****
 
   *--------- STIFFNESS MATRIX SETUP ---------*
 SYMBOLIC DIM : ND =  155532 NZ =   2897175 NB_MAX =      26
 FINAL    DIM : ND =   47480 NZ =    761383 NB_MAX =      26
 
     --STIFFNESS MATRIX WILL BE REFORMED AFTER EACH    3  ITERATIONS--
 
 
   * CONVERGED WITH    0 ITERATIONS, |du|/|u|,|r|/|r0|,|dE|/|E|= 0.1000E+01 0.0000E+00 0.1000E+01
 
 WARNING INTERFACE        701
 NODE      13703 DE-ACTIVATED FROM INTERFACE
 WARNING INTERFACE        701
 NODE      13548 DE-ACTIVATED FROM INTERFACE
 WARNING INTERFACE        701
 NODE      13693 DE-ACTIVATED FROM INTERFACE
     ANIMATION FILE: pression_statique_07A002 WRITTEN
 
   * IMPLICIT COMPUTATION TERMINATED WITH    TOTAL NONLINEAR ITERATIONS:       0
   * TOTAL NUM.OF MATRIX FACTORIZATION AND PCG ITERATION:      0         0

     RESTART FILES: pression_statique_07_0001_[0001-0001].rst WRITTEN
     -------------

 
                           ** CPU USER TIME **
 
 #PROC  [K]SETUP [M]SETUP IMPL.SOLV IMPL.TOTAL
   1   .4862E+02 .0000E+00 .0000E+00 .4930E+02
 #PROC  CONT.SORT  CONT. F   ELEMENT  KIN.COND.  INTEGR.    I/O     TASK0     ASSEMB.   RESOL  
   1   .5591E-01 .6813E-02 .2678E+00 .2133E-01 .4654E-03 .5012E+00 .9117E-03 .1199E-01 .5030E+02

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

 

Thank you a lot,

 

Kinds regards,

 

Alice

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