Hello,

I have an ABAQUS model with approximately 3 million elements, most of them are structural shells (S4 and S3), few solid elements (C3D8 and C3D6), surface elements (SFM3D4), bema elements (B31) and several connectors (CONN3D2). The connectors are used to define mesh free fasteners through the *FASTENER, INTERACTION keyword.

The Issue: When running a linear elastic buckling analysis of this model using *BUCKLE the analysis time is very long (~ 6 to 9 hours depending on the reference load applied). The same model running in a Static General analysis runs in a very short time.

The issue appears to lie on the direct solver using the subspace method, which is the only one available for this model and the *BUCKLE keyword. The MSG file has this line "ELEMENT OPERATIONS WILL NOT BE CARRIED OUT IN PARALLEL". That tells me the solver is running on 1CPU and that GPU acceleration is not being used either.
 

Is it possible to improve (i.e. shorten) the analysis time Abaqus is taking to run one this buckling analysis?