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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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