Local prebuckling deformation from linear theory and linear buckling (bifurcation point) of an Intermittantly axially compressed thin cylindrical shell

This and the next image are from:
https://enterfea.com/linear-vs-nonlinear-buckling/ - Enterfea – linear vs nonlinear buckling.

As will be seen from the next image, the use of Linear Buckling Analysis (LBA) is not suitable in this case in which there are likely to be large local deformations arising from the high-amplitude concentrated axial loading.

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