Material bend characteristics

[detection1]

Hi guys.

I am trying to work out how much force / energy would be required to bend a 219mm diameter mild steel tube that has a 16mm wall. And then to work out how thick a tube of say 150mm would need to be to take the same force before it begun to bend.

Any thoughts?

Thanks

 

[Guest102023]

The tube is a beam under simple 3-point bending. You know or can calculate all the parameters required to predict the onset of yielding at the top and bottom - span, second moment of inertia, etc. Except for the actual yield strength of course - go to the MTR for that.

Try finding a well-equipped machine or structural steel shop that does this every day and they probably have readymade tables that their workmen follow.

 

[salmon2]

Finite element simulation and then testing to confirm it if you are considering large plastic deformation.

If it is within elastic limit and assume pipes are in pure bending, you can calculate the max strain/stress which should be on the outer curvature.

 

[EdStainless]

But you are aware that the smaller tube will deflect much more before you reach its yield. It may be as strong but will not be as stiff.

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Plymouth Tube