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This and the following three slides are taken from the "Research" page of Dr. Alexander Yevkin's (Evkin's) home page:
http://www.soft4structures.com/yevkin/
Dr. Yevkin writes: "... experiments as well as numerical and analytical solutions show that shell equilibrium configurations with large deflections are quite different from classical buckling modes. They consist of regions of inextensional strain (for example, an inverted part of sphere) surrounded by narrow zones of extensive bending and membrane deformations (inner boundary layers)."
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