This is Fig. 6 from the paper, "BOSOR5 - Program for buckling of elastic-plastic complex shells of revolution including large deflections and creep", by David Bushnell, Computers & Structures, Vol. 6, pp.221-239. 1976.
This slide shows:
(a) Discretized model of the 45-degree cone-cylinder specimen for analysis by BOSOR5 and
(b) an exaggerated view of the axisymmetric prebuckling deflected shape at the buckling pressure.
The material in the immediate neighborhood of the cone-cylinder junction is stressed beyond its proportional limit at the buckling pressure.
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