Elastic Buckling Modes

This is a short video, showing the elastic critical buckling modes of a lipped channel section under uniform axial compression, while the length is increased. The cross section is LC 100x70x15x2.70 mm. Local buckling starts with L=100mm Distortional buckling starts with L=567mm Global buckling starts with L=1840mm 00:00 Local Buckling 00:22 Distortional Buckling 00:38 Global Buckling Which frame is possible to notice a local-distortional buckling interaction? Can you find it?