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Smadiche

compliance is negative or large

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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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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! ;-)


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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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