Abaqus error in in keyword *BOUNDARY

[Tinni1]

Hello,

I am doing a three-point bending analysis of a cold-formed steel beam. In the post-buckling analysis using the Abaqus explicit solver, I got the below error:

in keyword *BOUNDARY, file "Job-18.inp", line 55500: Unknown assembly id 2

I have applied boundary conditions at the reference nodes of the rigid plate element , which has been used as the support.

Could anyone please explain what this error means?

Picture of my abaqus model is below:

 

[FEA way]

Sounds like a boundary condition using node number directly, without referring to part/instance number.

 

[Tinni1]

Thanks, for your response.
I applied the boundary condition at the reference points of the rigid rectangular plate elements.

What should I do to get rid of this error?

 

[FEA way]

Was the part created as rigid or as deformable and just made rigid via rigid body constraint ? Was the REF point created on the Part or Assembly level ?

 

[Tinni1]

The support plates at both end and the loading plate at the top was created as discrete rigid plate elements. The reference points were created at the part level. I have used three seperate discrete rigid plates as loading plate and the two support plates.

 

[FEA way]

Since it's a post-buckling problem, is it an individual analysis or does it use import functionality, for instance ? Were any changed made in the input file or was it completely configured in Abaqus/CAE ?

 

[Tinni1]

In the post-buckling analysis, imperfections were imported from the buckling analysis by the edit attribute function in Abaqus CAE in the input file. Is it because of importing the imperfections?

 

[FEA way]

Try without them to find out. Generally speaking, it might be best to export the input file and correct it manually in such cases. Built-in keyword editor can cause unexpected issues.

 

[Tinni1]

Great! Thanks a lot. I will try as advised.