compliance is negative or large

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

Hi all,

I had given run in optistruct for linear static analysis

but it shows like this -

*** WARNING # 312

In static load case 10

the compliance is negative or large 1.389270E+08

Optimization/buckling analysis cannot be performed

due to possible rigid body mode

wat is this mean????

wat is compliance???

Can anyone pls help me??/:-({|=

Thanks&Regards

Sai

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Answers

  • tinh
    tinh Altair Community Member
    edited December 2012

    Hi,

    If you run analysis only, turn 'run options' to 'analysis'. You seem to set inconsistent material parameters, please check again if young modulus is too small

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2013

    Hi

    I had the same question during analyzing，did u solve the case？

    bset regards！

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2014

    i had the same problem: i had a geometry and the loads where attached to a RBE2 Element. There was a failure in the DOF. I chanced that and the error disappeared. maybe that helps…… but i am not sure if this really caused the problem. good luck! ;-)

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2015

    I had a similar problem. The cause was improper contact surface definition.

  • Merula_20758
    Merula_20758 Altair Community Member
    edited October 2015

    Check your boundary conditions. Large compliance means, your model 'flys away'.

    One cause can be no stiffness, another as stated missing contact definitions, another can be missing links in rigids or wrong BCs.

     

    Best regards,

    Merula

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