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from the "Research" page of Dr. Alexander Yevkin's (Evkin's) home page:
http://www.soft4structures.com/yevkin/
Dr. Yevkin writes: "I had an exiting collaboration with a brilliant experimenter Dr. V. Krasovski. We investigated the pre-buckling and post-buckling behavior of isotropic cylindrical shells under axial load and additional local perturbations. Previous experimental investigations of buckling of compressed high-quality shells, conducted using a high-speed video camera, have shown that the loss of stability begins with formation of one or several small local dents, which initiate continuous formation process of stable periodic post-buckling configuration. Stable local post-buckling configurations were also obtained in special experiments with high-quality shells under external local perturbations of their surface in the certain loading ranges. This implies that the local character of buckling is an essential feature of real shells."
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