Curvature of a bended Tube



I try to analyse the ovalisation of a bended tube. To reach my goal i made a three-point bending model where i bend a tube made of plate elements. (pic5)

Now i want to analyse the behavior of my tube when the tube changes the profile from circular to oval.(Pic 6)

For that, my idea was to maka a plot where i make a realation between Curvature and Moment (Mz).

Something like: y Axis = Curvature ; and x Axis= Mz(x)


Do you have any experience in doing such a thing?

Kind Regards


Ps.: some genereal questions cuz i am not that expierienced, do you think my element size is small enough to make a analyse about the curvature of a tube?