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This and the next slide show buckling of torispherical shells under uniform internal pressure. The experiments were conducted by Gerry Galletly at the University of Liverpool during the late 1970s and early 1980s.
Shells of this type exhibit stability in the far post-buckling regime.
This slide shows a mylar specimen in its post-buckled state. The buckles are elongated in the meridional direction because the prebuckled stress state in the knuckle region is local circumferential compression combined with meridional tension, a prebuckling stress state similar to that in the LNG tank model shown earlier.
As the internal pressure is increased beyond initial buckling, additional buckles, remote from existing buckles because of relief of local circumferential compression in the neighborhoods of existing buckles, appear one by one or perhaps in pairs.
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