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term describing bending behavior

term describing bending behavior

term describing bending behavior

(OP)
Problem: Take a u-channel and bend it with the legs facing away from the bend axis. The channel bends uniformly, stretching the legs. If you then bend the same u-channel with the legs facing toward the inside of the bend, the legs quickly buckle. What is the term that describes this behavior? Can someone point me to a reference that speacks to this subject?

Many thanks!

RE: term describing bending behavior

For clarity, I'd say "legs out" or "flanges out" or "legs in" or "flanges in".  I'm not sure there's a standard nomenclature, because channels don't behave well when bent either way, so it's not a particularly common operation.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: term describing bending behavior

flexural buckling ?   

RE: term describing bending behavior

medpac,

   Compressive buckling?

   Metal structures usually do not fracture in compression.  They buckle.

               JHG

RE: term describing bending behavior

I call it the steel tape measure effect. I'm not aware of any more official name. I'm sure the math has been analyzed  quite extensively. NASA and others have used the effect to make struts and booms for spacecraft which can be rolled-up and then deployed. You could try searching the NASA site for technical publications.

RE: term describing bending behavior

"the effect to make struts and booms for spacecraft which can be rolled-up and then deployed" ... if that's what the OP is after, "metallic memory" is a term i've heard.

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