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This and the next few slides are for buckling of spherical shells under an inward-directed concentrated load.
From the "Research" page of Dr. Alexander Yevkin's (Evkin's) home page:
http://www.soft4structures.com/yevkin/
Dr. Yevkin writes: "The unique experimental studies of elastic rubber spherical shells under uniform external pressure and concentrated load were conducted together with my postgraduate student Dr. S. Duginetz. The load-displacement diagrams have been obtained for deflections whose values reached the radius of the shell. Equilibrium configurations were also studied." (See the next slide.)
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