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Crushed soda can

From:
http://construct.typepad.com/25seven/2009/01/engineering-buckling-limit-of-frame-tubing.html
January 3, 2009, "Rob Vandermark's perspective on Seven Cycles"

Rob Vandermark writes:

"The concept of shell bucking is simple. And the simplest example of unstable shell bucking is seen in the result of holding a soda can at both ends and twisting the ends in opposite directions—the can buckles. It buckles because the can is an unstable shell [when loaded high enough in compression and/or torque]."

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