Buckling occurs when the structure becomes unstable and can no longer resist the applied load. Typically, this type of behavior occurs in structures under high compressive load: classic examples are submersibles and load bearing towers. Linear buckling theory takes into effect the very real physical mechanism of stress stiffening due to tensile loads or by reducing the stiffness due to compressive axial loads. This differential stiffness is a function of the geometry and applied loads.

[πΎπ‘Ž]+{π‘ƒπ‘π‘Ÿπ‘–π‘‘π‘–π‘π‘Žπ‘™}[πΎπ‘‘π‘–π‘“π‘“π‘’π‘Ÿπ‘’π‘›π‘‘π‘–π‘Žπ‘™]=0

However, the key assumption is that deflections are small up to the point of buckling and that the stress level prior to buckling is below the yield point of the material.  In this video, we explore two methods of solving buckling problems with Simcenter Femap and Simcenter Nastran.   

 

0:36 Analysis Manager - Linear buckling analysis setup
1:05 Results - Linear buckling result set discussion
1:36 PostProcessing Toolbox - Post-processing deformed buckling shape
2:11 Analysis Manager - Nonlinear buckling analysis setup
2:45 Nonlinear Control Options - Setting time steps and output control for the nonlinear solver
3:25 Analysis Monitor - Discussion of Nonlinear history, Load step convergence and Fatal Error (failed convergence)
4:30 MultiSet Animate
5:05 Chart Data Series - Plotting deflection vs load

 

If you found this video helpful or useful, consider registering for our Simcenter Femap training: https://www.appliedcax.com/training