bar bending max radii

[MrMetals]

Is there a formula to figure out how much stresses would come into play when bending a solid 5/8" non ferrous bar, specifically n04400? I want to know if it would crack?

 

[Leftwow]

ACI code chapter 7 will show you what you need to d at least

 

[JStephen]

The "crack" information may not be available.

From basic principles, you can figure out the strain for a particular radius. If you're plastically bending it, stress will be somewhere around the yield point, depending on how the stress-strain curve is shaped. Whether that results in a crack is a different issue.

ASME does have some limitations on the amount of forming that can be done cold, that I supposed relate indirectly to this problem.

AISC-ASD gives minimum bending radius for carbon steel.

Also, note that for a given material, it could be cold-worked, annealed, etc., so there may not be a single answer.

 

[racookpe1978]

The outer fibers on the 5/8 bar will be pulled the furthest = they will break (tear through) first.

You'll find that the square 5/8 x 5/8 pieces will fail more often than the 5/8 round shapes - even though both are nominally the same distance from the center of the bend. More fibres on the sq piece to fail.