Is it possible to solve buckling in Abaqus with only residual stress defined as predefined load?

[frobles]

Hi Sirs,

As title, I wondering if the problem can be solved with only material residual stress but no other external load applied?

After several trials, Abaqus returns message
"MASS OR DIFFERENTIAL STIFFNESS MATRIX IS COMPLETELY NULL. THE EIGENPROBLEM CANNOT BE SOLVED. IN A *BUCKLE ANALYSIS THE MOST LIKELY CAUSE IS THAT A NONZERO LOADING PATTERN WAS NOT SPECIFIED VIA *BOUNDARY, *CLOAD, *DLOAD, ETC,. SEE Eigenvalue Buckling Prediction IN THE ABAQUS/STANDARD USERS MANUAL"

However, in my case, no external load but only residual stress within materials and buckling does occur.

Any expert has suggestions or experience on this? Very thanks.

FELIPE

 

[Mustaine3]

That makes no sense. When you have no load, what do you expect as result from a buckling analysis?

 

[frobles]

The load is the compressive residual stress. The buckle should be caused by only this residual stress, no other external load.

 

[Mustaine3]

You seem not to understand. The buckling step does not cause or perform any buckling, it just calculates buckling load. So why are you using *Buckle, when you are not interested in the buckling load?

 

[TGS4]

Your physical problem is not one of residual stress, but of deformation and stresses that causes some plastic deformation, and then a load step where the deformation and loads are removed/changed. Residual stress is not the cause, but the effect. Think about that.

 

[frobles]

Thanks, Mustaine3 and TGS4. I think I better understand now the problem I'm solving.