Altair RISE

A program to recognize and reward our most engaged community members

Nominate Yourself Now!

compliance is negative or large

Altair Forum User

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

Find more posts tagged with

English

OptiStruct

Accepted answers

All comments

tinh

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

I had the same question during analyzingÔºådid u solve the caseÔºü

bset regardsÔºÅ

Altair Forum User

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

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

Merula_20758

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