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* ERROR # 312 *

I keep getting the following error message:

*** ERROR # 312 ***
In static load case 1
the compliance is negative or large 1.46469e+10.
Optimization/buckling analysis cannot be performed
due to possible rigid body mode.

What does this mean and how can I fix it? I have checked that my constraint DOF are the same as my loads and am unsure why the optimization is not running. I have attached the .hm and output file.

FinalUprightV2.hm

FinalUprightV2_004.out

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HyperMesh

Accepted answers

Adriano_Koga

if you perform a simples analysis run (no optimization), it shows large displacements, meaning there are rigid body motions in your model, due to lack of constraint.

if you examine tyour model, you can find a couple non-connected nodes/elements. These are crucial for your model to run properly, and later, run optimization.

You might want to equivalence these nodes or create a tied/freeze contact to glue them.

All comments

Adriano_Koga

if you perform a simples analysis run (no optimization), it shows large displacements, meaning there are rigid body motions in your model, due to lack of constraint.

if you examine tyour model, you can find a couple non-connected nodes/elements. These are crucial for your model to run properly, and later, run optimization.

You might want to equivalence these nodes or create a tied/freeze contact to glue them.