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How to calculate the post-buckling process (nonlinear)

Experimenter
Experimenter

I am a beginner of the nonlinear NX nastran. 

 

I would like to calculate the post-buckling process: the plate deflection grows up but the load grows down as the shown in the attached figure. I also attached the .modfem file as the example. 

 

Can anybody kown how to do it?

 

Many thanks!

 

ljc