This is Fig. 1 from the paper, "Comparisons of test and theory for nonsymmetric elastic-plastic buckling of shells of revolution" by David Bushnell and Gerard D. Galletly, International Journal Solids Structures, Vol. 10, pp. 1271-1286, 1974, called "1974 Galletly paper" in the next two slides.
This slide shows an aluminum torispherical pressure vessel with an axisymmetric nozzle tested under external pressure by Galletly at the University of Liverpool.
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