The stems of many plants resist buckling using low-density foam cores.

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“Anyone who has squashed an empty metal can knows about the second form of buckling; it’s called ‘local buckling’ or ‘Brazier buckling…Local buckling does occur in biological columns–it’s certainly involved in the lodging of slender crop plants in wind storms, and it can be deliberately induced in any dandelion stem. A low-density foam core reduces susceptibility, and many plants (but not dandelions!) have such cores.” (Vogel 2003:378)

Comparative Biomechanics: Life's Physical World, Second EditionJune 17, 2013
Steven Vogel

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