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*** ERROR # 4966 *** Minimum time increment reached, analysis aborted in Rubber simulation

User: "Joshua_20873"
Joshua_20873
Altair Community Member
Updated by Joshua_20873

Hallo, 

ich möchte das Verhalten einer Gummidichtung in einem einfachen Modell simulieren, leider erhalte ich dabei immer folgende Fehlermeldung: 
*** ERROR # 4966 *** Minimum time increment reached, analysis aborted.
Ich habe bereits ein höheres Anfangsinkrement (NINC) sowie ein höheres Mindestinkrement (DTMIN) verwendet. Weiterhin habe ich die Anzahl der Cutbacks hochgesetzt und das Netz verfeinert. Leider ohne Erfolg. 

Ich weiß nicht, wie ich dieses Problem lösen kann. Ich habe die .hm-Datei und das verwendete Materialmodell angehängt. Ich freue mich über jede Hilfe, danke.

 

I would like to simulate the behavior of a rubber seal in a simple model, unfortunately I always get the following error message: 
*** ERROR # 4966 *** Minimum time increment reached, analysis aborted.
I have already used a higher initial increment (NINC) and a higher minimum increment (DTMIN). I have also increased the number of cutbacks and refined the mesh. Unfortunately without success. 

I don't know how to solve this problem. I have attached the .hm file and the material model used. I appreciate any help, thank you.

 

aboyce.fem
Dichtungsmodell.hm

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    User: "loistf"
    loistf
    Altair Community Member
    Updated by loistf
    do you get convergence for any increment or not even that? does it run if you simplify to linear static? any other relevant warnings?
    User: "Joshua_20873"
    Joshua_20873
    Altair Community Member
    OP
    Updated by Joshua_20873

    Thanks for your reply.
    Yes, initially the calculation converges. I suspect that the non-convergence is due to a deformation of the elements. With a simple linear static the calculation runs but the contact conditions do not work. I have no more ideas to solve the problem. Attached is the out. file and a picture of the destroyed mesh in the non-converged increment. 

    Dichtungsmodell_secondorder.out
    Screenshot 2023-12-05 115101.png
    User: "loistf"
    loistf
    Altair Community Member
    Updated by loistf

    Thanks for your reply.
    Yes, initially the calculation converges. I suspect that the non-convergence is due to a deformation of the elements. With a simple linear static the calculation runs but the contact conditions do not work. I have no more ideas to solve the problem. Attached is the out. file and a picture of the destroyed mesh in the non-converged increment. 

     Just saw this warnings. Are you not using finite/consli contact? Might this be part of the problem? (that you are getting unexpected forces)

     

    *** WARNING # 4735
     No contact element is created for CONTACT 3 at the start of analysis.
     The SRCHDIS of this contact is 0.062515. It may be necessary to
     use a larger SRCHDIS (e.g., 0.406033) if the contact is not for
     finite/continuous sliding (TRACK=FINITE/CONSLI) with LGDISP analysis.
     It is also possible that the secondary nodes/facets are not in the projection
     zone of the main surface.
      
     

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