negative node stiffness error

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hi i'm getting negative node stiffness error in radioss block .  i'm doing simple top load analysis  using MAT15 orthotropic material model using shell elements. please let me know how can i resolve

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2015

    Hi,

     

    Are there any type2 or type7 contacts in your model?

     

    If you have type2, set SPOTFLAG=0 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2015

    yes i'm using both type 2 and type 7. for type 2 spot flag is 0

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2015

    with type2 with spot flag set to 0 you still face the same error?

     

    can you also change STFAC in type 7 to 1 and run the analysis?

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