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Buckling using ASET method in Femap

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nuraen

Structural
Oct 21, 2022
3
US
Need help setting up Buckling using ASET method in Femap.
I got a FATAL after an attempt at running a model.
I ran a static model, modified the .DAT file for buckling, added statsubs and method to all the subcases; added the EIGRL card, created a new constraint group (fixing all 6dofs) and used the group to create ASET bdf. Is fixing the 6dof appropriate? If yes, what could be source of the singularity FATAL I am getting?

 
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What version of Femap are you using? Support for STATSUB was added in Femap 2019.1
 
ASET GRIDs should have all 6DOF constrained. You also need to include an SPC in addition to the ASET. See below for an example case control:

SUBCASE 1
SUBTITLE = STATIC_RUN​
SPC = 1​
LOAD = 1​

SUBCASE 2
SUBTITLE = BUCKLING​
SPC = 1​
STATSUB = 1 (static subcase)​
METHOD = 1 (EIGRL METHOD ID)​

BEGIN BULK
ASET 1 123456
ASET 2 123456
ASET 3 123456
ASET 4 123456
...
 
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