This slide show demonstrates shell buckling that is:
Part 1 very sensitive to initial imperfections (next 7 slides)
Part 2 moderately sensitive to initial imperfections (following set of 12 slides)
Part 3 not sensitive to initial imperfections (second-to-last set of four slides)
Part 4 example of a complex shell with an unexpected but modelable "imperfection" (last set of four slides)
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