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.

 

[ravenprp]

When a tube undergoes bending, it experiences internal stress due to the deformation of its shape. In your case, the circular tube with a diameter of 20mm and thickness of 1mm being bent into a radius of 50mm, it has entered the plastic stage. This means that the material has undergone permanent deformation and its properties have changed.

The change in material properties depends on the type of steel used for the tube. Steel is a ductile material, meaning it can undergo plastic deformation without breaking. However, the specific type and composition of steel can affect its response to bending and its resulting properties.

To calculate the change in material properties, you can use the stress-strain curve for the specific type of steel used in the tube. This curve shows the relationship between the applied stress and the resulting strain (deformation) of the material. By measuring the strain at the point of bending, you can determine the stress applied to the material. From there, you can use the stress-strain curve to calculate the change in properties such as yield strength, ultimate tensile strength, and modulus of elasticity.

It is important to note that the material properties may also be affected by other factors such as the temperature and rate of bending. Therefore, it is essential to consider these factors when calculating the change in material properties due to tube bending.

In conclusion, the material properties of the steel tube have changed due to the plastic deformation caused by bending. To accurately calculate the change in properties, you can use the stress-strain curve for the specific type of steel used in the tube, taking into account other factors such as temperature and rate of bending.