Tube bending ?

[Jamaz17]

Hey everyone,

I have to bend a piece of round steel tubing 20 deg with an OD of 1.75in and a wall thickness of .125in. Does anyone know what formula I might use to calculate the force I would require to bend this pipe to these specs ? I'm trying to spec out a cylinder but I'm not sure how much force I will need?

Thanks for the help.

-James

 

[Beggar]

You should be able to bound your problem by treating it as a beam and solving the beam equation using the end conditions that best approximate your bending fixture.

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[tonyuk]

The normal beam equations assume that the steel is stressed within the range where normal elastic behaviour occurs. To bend it you need to stress it to a point where it yields.

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[JStephen]

Assume yield stress over the whole cross section to find bending moment (approximately). If you have a stress-strain curve, guess you could come a bit closer.