Internal stress due to tube bending

AI Thread Summary
Bending a circular steel tube with a diameter of 20mm and a thickness of 1mm into a radius of 50mm results in the material entering the plastic stage, affecting its properties. To calculate the change in material properties, a true stress-strain curve for the steel is essential, as it provides the necessary data for analysis. Nonlinearities in the material behavior must also be accounted for, as discussed in previous threads. Conducting a finite element analysis (FEA) of the bending process can help extract strain hardening information from the results. Understanding these factors is crucial for accurately assessing the material's performance post-deformation.
chandran
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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
 
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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.
 

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