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Fig. 74 from the paper, “Plastic Buckling” by David Bushnell, Chapter 2.4 in Pressure Vessels and Piping: Design Technology - 1982 A Decade of Progress, S.Y. Zamrik and D. Dietrich, editors, published by ASME, 1982, pp. 47-117, called "1982 decade paper" in the next several slides.
This slide shows an externally pressurized steel ellipsoidal shell (football shaped) with internal rings welded to it. The shell was fabricated and tested at the David Taylor Model Basin in Maryland.
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