Internal stress due to tube bending

[chandran]

i have a circular tube of diameter 20mm,thickness 1mm and length 500 metres

i bend the tube into a radius of 50mm. obviously the tube has entered the plastic stage. But what would have happened to the material properties.

hOW CAN I CALCULATE THE CHANGE IN MATERIAL PROPERTIES. THE MATERIAL
OF THE TUBE IS STEEL

 

[PerennialII]

Account for the nonlinearities, both types, which were discussed in that other thread. As additional material property information you will need some form of a true stress-strain curve for the tube material in order to accurately compute what is going on in the plastic region. I'd suggest doing a simple FE - analysis of the bending and extracting the amount of strain hardening from the results.