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Re: Folding Plate

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On Dec 30, 2005, at 12:30 PM, Avicpeng wrote:

Can anyone lead me to a rule of thumb, or code requirement, that defines the minimum radius for cold bending a plate (once)?
3t is the rule I've always used for carbon steel. The minimum for less ductile materials a probably twice that. If you figure out the strain built into the outer fiber of a piece of material bent to a 3t radius (assume the middle surface is unstrained) you'll see it's approaching the elongation at break, so if you try to use smaller bend radii, you're likely to get cracks.

Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw(--nospam--at)skypoint.com   | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania 1864)
http://www.skypoint.com/~chrisw/


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